Skip to content
Fencer Vulns
high 7.8

CVE-2025-21756 json

vsock: Keep the binding until socket destruction

published 2025-02-27 20 mo ago modified 2026-10-15 25 d ago also EUVD-2025-5169

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

vsock: Keep the binding until socket destruction

Preserve sockets bindings; this includes both resulting from an explicit bind() and those implicitly bound through autobind during connect().

Prevents socket unbinding during a transport reassignment, which fixes a use-after-free:

1. vsock_create() (refcnt=1) calls vsock_insert_unbound() (refcnt=2) 2. transport->release() calls vsock_remove_bound() without checking if sk was bound and moved to bound list (refcnt=1) 3. vsock_bind() assumes sk is in unbound list and before __vsock_insert_bound(vsock_bound_sockets()) calls __vsock_remove_bound() which does: list_del_init(&vsk->bound_table); // nop sock_put(&vsk->sk); // refcnt=0

BUG: KASAN: slab-use-after-free in __vsock_bind+0x62e/0x730 Read of size 4 at addr ffff88816b46a74c by task a.out/2057 dump_stack_lvl+0x68/0x90 print_report+0x174/0x4f6 kasan_report+0xb9/0x190 __vsock_bind+0x62e/0x730 vsock_bind+0x97/0xe0 __sys_bind+0x154/0x1f0 __x64_sys_bind+0x6e/0xb0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Allocated by task 2057: kasan_save_stack+0x1e/0x40 kasan_save_track+0x10/0x30 __kasan_slab_alloc+0x85/0x90 kmem_cache_alloc_noprof+0x131/0x450 sk_prot_alloc+0x5b/0x220 sk_alloc+0x2c/0x870 __vsock_create.constprop.0+0x2e/0xb60 vsock_create+0xe4/0x420 __sock_create+0x241/0x650 __sys_socket+0xf2/0x1a0 __x64_sys_socket+0x6e/0xb0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Freed by task 2057: kasan_save_stack+0x1e/0x40 kasan_save_track+0x10/0x30 kasan_save_free_info+0x37/0x60 __kasan_slab_free+0x4b/0x70 kmem_cache_free+0x1a1/0x590 __sk_destruct+0x388/0x5a0 __vsock_bind+0x5e1/0x730 vsock_bind+0x97/0xe0 __sys_bind+0x154/0x1f0 __x64_sys_bind+0x6e/0xb0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e

refcount_t: addition on 0; use-after-free. WARNING: CPU: 7 PID: 2057 at lib/refcount.c:25 refcount_warn_saturate+0xce/0x150 RIP: 0010:refcount_warn_saturate+0xce/0x150 __vsock_bind+0x66d/0x730 vsock_bind+0x97/0xe0 __sys_bind+0x154/0x1f0 __x64_sys_bind+0x6e/0xb0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e

refcount_t: underflow; use-after-free. WARNING: CPU: 7 PID: 2057 at lib/refcount.c:28 refcount_warn_saturate+0xee/0x150 RIP: 0010:refcount_warn_saturate+0xee/0x150 vsock_remove_bound+0x187/0x1e0 __vsock_release+0x383/0x4a0 vsock_release+0x90/0x120 __sock_release+0xa3/0x250 sock_close+0x14/0x20 __fput+0x359/0xa80 task_work_run+0x107/0x1d0 do_exit+0x847/0x2560 do_group_exit+0xb8/0x250 __x64_sys_exit_group+0x3a/0x50 x64_sys_call+0xfec/0x14f0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Patch / fix

  • Linux Linux 5.10.235, 5.15.179, 6.1.131, 6.6.79, 6.12.16, 6.13.4, 6.14
  • linux Debian 12 6.1.133-1
  • linux Debian 14, Debian 13 6.12.16-1

debian advisories DEBIAN-CVE-2025-21756

  • linux Ubuntu 22.04 LTS 5.15.0-138.148
  • linux Ubuntu 24.04 LTS 6.8.0-58.60
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1082.89
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1027.29
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1081.90
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1028.30
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1079.85
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1023.27

ubuntu advisories UBUNTU-CVE-2025-21756

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kpatch-patch-4_18_0-553_40_1 RHEL 8 1-2.el8_10
  • kpatch-patch-4_18_0-553 RHEL 8 1-6.el8_10
  • kpatch-patch-4_18_0-553_16_1 RHEL 8 1-5.el8_10
  • kpatch-patch-4_18_0-553_30_1 RHEL 8 1-4.el8_10
  • kernel RHEL 10.0 6.12.0-55.13.1.el10_0
  • rv RHEL 10.0 6.12.0-55.13.1.el10_0
  • perf RHEL 10.0 6.12.0-55.13.1.el10_0
  • rtla RHEL 10.0 6.12.0-55.13.1.el10_0

red hat advisories RHSA-2025:8346RHSA-2025:8347RHSA-2025:8348RHSA-2025:8344RHSA-2025:8345RHSA-2025:8343

  • kernel-livepatch-MICRO-6-0-RT_Update_3 Linux Micro 6.0 12-1.2
  • kernel-livepatch-MICRO-6-0-RT_Update_4 Linux Micro 6.1, Linux Micro 6.0 9-1.1
  • kernel-livepatch-MICRO-6-0-RT_Update_5 Linux Micro 6.1, Linux Micro 6.0 8-1.1
  • kernel-livepatch-MICRO-6-0_Update_3 Linux Micro 6.0 12-1.2
  • kernel-livepatch-MICRO-6-0_Update_2 Linux Micro 6.1, Linux Micro 6.0 12-1.1
  • kernel-livepatch-MICRO-6-0_Update_4 Linux Micro 6.1, Linux Micro 6.0 10-1.2
  • kernel-livepatch-MICRO-6-0_Update_5 Linux Micro 6.1, Linux Micro 6.0 8-1.2
  • kernel-livepatch-MICRO-6-0-RT_Update_2 Linux Micro 6.1, Linux Micro 6.0 12-1.1

suse advisories SUSE-SU-2025:03408-1SUSE-SU-2025:03406-1SUSE-SU-2025:03400-1SUSE-SU-2025:03397-1SUSE-SU-2025:03395-1SUSE-SU-2025:03393-1

  • kernel AlmaLinux 8 4.18.0-553.53.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.53.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.53.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.53.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.53.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.53.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.53.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.53.1.el8_10

almalinux advisories ALSA-2025:8056ALSA-2025:8057ALSA-2025:7903

  • kernel Rocky Linux 10 6.12.0-55.13.1.el10_0
  • kernel-rt Rocky Linux 8 4.18.0-553.53.1.rt7.394.el8_10
  • kernel Rocky Linux 8 4.18.0-553.53.1.el8_10

rocky linux advisories RLSA-2025:8137RLSA-2025:8057RLSA-2025:8056

  • kernel CBL-Mariner 2.0 5.15.180.1-1
  • kernel Azure Linux 3.0 6.6.82.1-1

azure linux advisories AZL-58995AZL-59037

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-21756 updated cvss 7.8

kernel: vsock: Keep the binding until socket destruction

  • Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-debuginfo-common-x86_64 4.18.0-477.97.1.el8_8, kernel-debuginfo-common-aarch64 4.18.0-477.97.1.el8_8, kernel-debuginfo-common-ppc64le 4.18.0-477.97.1.el8_8
    fixed: vendor fix RHSA-2025:7682
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.117.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.117.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.117.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.117.1.el9_2
    fixed: vendor fix RHSA-2025:7683
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.68.2.el9_4, libperf 5.14.0-427.70.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.68.2.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.70.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.68.2.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.70.1.el9_4, +4 more
    fixed: vendor fix RHSA-2025:8058
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-570.17.1.el9_6, perf 5.14.0-570.17.1.el9_6, rtla 5.14.0-570.17.1.el9_6, python3-perf 5.14.0-570.17.1.el9_6, kernel-devel-matched 5.14.0-570.17.1.el9_6, kernel-64k-devel-matched 5.14.0-570.17.1.el9_6, +7 more
    fixed: vendor fix RHSA-2025:7903
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-55.13.1.el10_0, perf 6.12.0-55.13.1.el10_0, rtla 6.12.0-55.13.1.el10_0, python3-perf 6.12.0-55.13.1.el10_0, kernel-devel-matched 6.12.0-55.13.1.el10_0, kernel-64k-devel-matched 6.12.0-55.13.1.el10_0, +7 more
    fixed: vendor fix RHSA-2025:8137
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.132.1.el9_0, kernel-devel-matched 5.14.0-70.132.1.el9_0, kernel-debug-devel-matched 5.14.0-70.132.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.132.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.132.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.132.1.el9_0, +2 more
    fixed: vendor fix RHSA-2025:7897
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.117.1.el9_2, rtla 5.14.0-284.117.1.el9_2, kernel-devel-matched 5.14.0-284.117.1.el9_2, kernel-64k-devel-matched 5.14.0-284.117.1.el9_2, kernel-debug-devel-matched 5.14.0-284.117.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.117.1.el9_2, +5 more
    fixed: vendor fix RHSA-2025:7683
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.68.2.el9_4, rv 5.14.0-427.70.1.el9_4, perf 5.14.0-427.68.2.el9_4, perf 5.14.0-427.70.1.el9_4, rtla 5.14.0-427.68.2.el9_4, rtla 5.14.0-427.70.1.el9_4, +18 more
    fixed: vendor fix RHSA-2025:8058
show 31 more
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.53.1.el8_10, kernel 4.18.0-553.53.1.el8_10, bpftool 4.18.0-553.53.1.el8_10, kernel-core 4.18.0-553.53.1.el8_10, kpatch-patch-4_18_0-553 1-6.el8_10, kernel-tools 4.18.0-553.53.1.el8_10, +19 more
    fixed: vendor fix RHSA-2025:8056
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.17.1.el9_6, kernel-64k 5.14.0-570.17.1.el9_6, kernel-core 5.14.0-570.17.1.el9_6, kernel-tools 5.14.0-570.17.1.el9_6, kernel-modules 5.14.0-570.17.1.el9_6, kernel-64k-core 5.14.0-570.17.1.el9_6, +27 more
    fixed: vendor fix RHSA-2025:7903
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-55.13.1.el10_0, kernel-64k 6.12.0-55.13.1.el10_0, kernel-core 6.12.0-55.13.1.el10_0, kernel-tools 6.12.0-55.13.1.el10_0, kernel-modules 6.12.0-55.13.1.el10_0, kernel-64k-core 6.12.0-55.13.1.el10_0, +27 more
    fixed: vendor fix RHSA-2025:8137
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.157.1.el8_4, kernel 4.18.0-305.157.1.el8_4, bpftool 4.18.0-305.157.1.el8_4, kernel-core 4.18.0-305.157.1.el8_4, kernel-tools 4.18.0-305.157.1.el8_4, python3-perf 4.18.0-305.157.1.el8_4, +8 more
    fixed: vendor fix RHSA-2025:7901
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.145.1.el8_6, kernel 4.18.0-372.145.1.el8_6, bpftool 4.18.0-372.145.1.el8_6, kernel-core 4.18.0-372.145.1.el8_6, kernel-tools 4.18.0-372.145.1.el8_6, python3-perf 4.18.0-372.145.1.el8_6, +8 more
    fixed: vendor fix RHSA-2025:7652
  • Red Hat Enterprise Linux BaseOS E4S (v.8.4) perf 4.18.0-305.157.1.el8_4, kernel 4.18.0-305.157.1.el8_4, bpftool 4.18.0-305.157.1.el8_4, kernel-core 4.18.0-305.157.1.el8_4, kernel-tools 4.18.0-305.157.1.el8_4, python3-perf 4.18.0-305.157.1.el8_4, +13 more
    fixed: vendor fix RHSA-2025:7901
  • Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.145.1.el8_6, kernel 4.18.0-372.145.1.el8_6, bpftool 4.18.0-372.145.1.el8_6, kernel-core 4.18.0-372.145.1.el8_6, kernel-tools 4.18.0-372.145.1.el8_6, python3-perf 4.18.0-372.145.1.el8_6, +19 more
    fixed: vendor fix RHSA-2025:7652
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.132.1.el9_0, bpftool 5.14.0-70.132.1.el9_0, kernel-core 5.14.0-70.132.1.el9_0, kernel-tools 5.14.0-70.132.1.el9_0, python3-perf 5.14.0-70.132.1.el9_0, kernel-modules 5.14.0-70.132.1.el9_0, +18 more
    fixed: vendor fix RHSA-2025:7897
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) perf 4.18.0-477.97.1.el8_8, kernel 4.18.0-477.97.1.el8_8, bpftool 4.18.0-477.97.1.el8_8, kernel-core 4.18.0-477.97.1.el8_8, kernel-tools 4.18.0-477.97.1.el8_8, python3-perf 4.18.0-477.97.1.el8_8, +19 more
    fixed: vendor fix RHSA-2025:7682
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.117.1.el9_2, kernel 5.14.0-284.117.1.el9_2, kernel-64k 5.14.0-284.117.1.el9_2, kernel-core 5.14.0-284.117.1.el9_2, kernel-tools 5.14.0-284.117.1.el9_2, python3-perf 5.14.0-284.117.1.el9_2, +32 more
    fixed: vendor fix RHSA-2025:7683
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.68.2.el9_4, bpftool 7.3.0-427.70.1.el9_4, kernel 5.14.0-427.68.2.el9_4, kernel 5.14.0-427.70.1.el9_4, kernel-64k 5.14.0-427.68.2.el9_4, kernel-64k 5.14.0-427.70.1.el9_4, +66 more
    fixed: vendor fix RHSA-2025:8058
  • Red Hat Enterprise Linux BaseOS TUS (v.8.4) perf 4.18.0-305.157.1.el8_4, kernel 4.18.0-305.157.1.el8_4, bpftool 4.18.0-305.157.1.el8_4, kernel-core 4.18.0-305.157.1.el8_4, kernel-tools 4.18.0-305.157.1.el8_4, python3-perf 4.18.0-305.157.1.el8_4, +8 more
    fixed: vendor fix RHSA-2025:7901
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.145.1.el8_6, kernel 4.18.0-372.145.1.el8_6, bpftool 4.18.0-372.145.1.el8_6, kernel-core 4.18.0-372.145.1.el8_6, kernel-tools 4.18.0-372.145.1.el8_6, python3-perf 4.18.0-372.145.1.el8_6, +8 more
    fixed: vendor fix RHSA-2025:7652
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.17.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.17.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.17.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.17.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.17.1.el9_6
    fixed: vendor fix RHSA-2025:7903
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-55.13.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.13.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.13.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.13.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.13.1.el10_0
    fixed: vendor fix RHSA-2025:8137
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.53.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.53.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.53.1.el8_10
    fixed: vendor fix RHSA-2025:8056
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.53.1.rt7.394.el8_10, kernel-rt-kvm 4.18.0-553.53.1.rt7.394.el8_10, kernel-rt-core 4.18.0-553.53.1.rt7.394.el8_10, kernel-rt-modules 4.18.0-553.53.1.rt7.394.el8_10, kernel-rt-debug-kvm 4.18.0-553.53.1.rt7.394.el8_10, kernel-rt-debug-core 4.18.0-553.53.1.rt7.394.el8_10, +4 more
    fixed: vendor fix RHSA-2025:8057
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.132.1.rt21.204.el9_0, kernel-rt-kvm 5.14.0-70.132.1.rt21.204.el9_0, kernel-rt-core 5.14.0-70.132.1.rt21.204.el9_0, kernel-rt-modules 5.14.0-70.132.1.rt21.204.el9_0, kernel-rt-debug-kvm 5.14.0-70.132.1.rt21.204.el9_0, kernel-rt-debug-core 5.14.0-70.132.1.rt21.204.el9_0, +4 more
    fixed: vendor fix RHSA-2025:7896
  • Red Hat Enterprise Linux NFV TUS (v.8.4) kernel-rt 4.18.0-305.157.1.rt7.234.el8_4, kernel-rt-kvm 4.18.0-305.157.1.rt7.234.el8_4, kernel-rt-core 4.18.0-305.157.1.rt7.234.el8_4, kernel-rt-modules 4.18.0-305.157.1.rt7.234.el8_4, kernel-rt-debug-kvm 4.18.0-305.157.1.rt7.234.el8_4, kernel-rt-debug-core 4.18.0-305.157.1.rt7.234.el8_4, +4 more
    fixed: vendor fix RHSA-2025:7902
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.17.1.el9_6, kernel-rt-64k 5.14.0-570.17.1.el9_6, kernel-rt-core 5.14.0-570.17.1.el9_6, kernel-rt-modules 5.14.0-570.17.1.el9_6, kernel-rt-64k-core 5.14.0-570.17.1.el9_6, kernel-rt-debug-core 5.14.0-570.17.1.el9_6, +14 more
    fixed: vendor fix RHSA-2025:7903
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-55.13.1.el10_0, kernel-rt-64k 6.12.0-55.13.1.el10_0, kernel-rt-core 6.12.0-55.13.1.el10_0, kernel-rt-modules 6.12.0-55.13.1.el10_0, kernel-rt-64k-core 6.12.0-55.13.1.el10_0, kernel-rt-debug-core 6.12.0-55.13.1.el10_0, +14 more
    fixed: vendor fix RHSA-2025:8137
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.132.1.rt21.204.el9_0, kernel-rt-core 5.14.0-70.132.1.rt21.204.el9_0, kernel-rt-modules 5.14.0-70.132.1.rt21.204.el9_0, kernel-rt-debug-core 5.14.0-70.132.1.rt21.204.el9_0, kernel-rt-debug-modules 5.14.0-70.132.1.rt21.204.el9_0, kernel-rt-modules-extra 5.14.0-70.132.1.rt21.204.el9_0, +2 more
    fixed: vendor fix RHSA-2025:7896
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-core 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-modules 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-debug-core 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-modules-core 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-debug-modules 5.14.0-284.117.1.rt14.402.el9_2, +4 more
    fixed: vendor fix RHSA-2025:7676
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.68.2.el9_4, kernel-rt 5.14.0-427.70.1.el9_4, kernel-rt-core 5.14.0-427.68.2.el9_4, kernel-rt-core 5.14.0-427.70.1.el9_4, kernel-rt-modules 5.14.0-427.68.2.el9_4, kernel-rt-modules 5.14.0-427.70.1.el9_4, +14 more
    fixed: vendor fix RHSA-2025:8058
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-570.17.1.el9_6, kernel-rt-kvm 5.14.0-570.17.1.el9_6, kernel-rt-core 5.14.0-570.17.1.el9_6, kernel-rt-modules 5.14.0-570.17.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.17.1.el9_6, kernel-rt-debug-core 5.14.0-570.17.1.el9_6, +6 more
    fixed: vendor fix RHSA-2025:7903
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-55.13.1.el10_0, kernel-rt-kvm 6.12.0-55.13.1.el10_0, kernel-rt-core 6.12.0-55.13.1.el10_0, kernel-rt-modules 6.12.0-55.13.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.13.1.el10_0, kernel-rt-debug-core 6.12.0-55.13.1.el10_0, +6 more
    fixed: vendor fix RHSA-2025:8137
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-kvm 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-core 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-modules 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-debug-kvm 5.14.0-284.117.1.rt14.402.el9_2, kernel-rt-debug-core 5.14.0-284.117.1.rt14.402.el9_2, +6 more
    fixed: vendor fix RHSA-2025:7676
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.68.2.el9_4, kernel-rt 5.14.0-427.70.1.el9_4, kernel-rt-kvm 5.14.0-427.68.2.el9_4, kernel-rt-kvm 5.14.0-427.70.1.el9_4, kernel-rt-core 5.14.0-427.68.2.el9_4, kernel-rt-core 5.14.0-427.70.1.el9_4, +18 more
    fixed: vendor fix RHSA-2025:8058
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.53.1.rt7.394.el8_10, kernel-rt-core 4.18.0-553.53.1.rt7.394.el8_10, kernel-rt-modules 4.18.0-553.53.1.rt7.394.el8_10, kernel-rt-debug-core 4.18.0-553.53.1.rt7.394.el8_10, kernel-rt-debug-modules 4.18.0-553.53.1.rt7.394.el8_10, kernel-rt-modules-extra 4.18.0-553.53.1.rt7.394.el8_10, +2 more
    fixed: vendor fix RHSA-2025:8057
  • Red Hat Enterprise Linux RT TUS (v.8.4) kernel-rt 4.18.0-305.157.1.rt7.234.el8_4, kernel-rt-core 4.18.0-305.157.1.rt7.234.el8_4, kernel-rt-modules 4.18.0-305.157.1.rt7.234.el8_4, kernel-rt-debug-core 4.18.0-305.157.1.rt7.234.el8_4, kernel-rt-debug-modules 4.18.0-305.157.1.rt7.234.el8_4, kernel-rt-modules-extra 4.18.0-305.157.1.rt7.234.el8_4, +2 more
    fixed: vendor fix RHSA-2025:7902
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-26-295-16 updated cvss 7.8

Siemens SIMATIC S7-1500 TM MFP

  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-24-102-01 updated cvss 5.5

Siemens SIMATIC S7-1500 TM MFP

  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-25-162-05 updated cvss 5.5

Siemens SIMATIC S7-1500 CPU family

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.5
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
14 mo ago

Exploit prediction

0.89% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.