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Fencer Vulns
high 7.8

CVE-2025-40271 json

fs/proc: fix uaf in proc_readdir_de()

published 2025-12-06 11 mo ago modified 2026-10-15 24 d ago also EUVD-2025-201584

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
1
Exploit-DB

Summary

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

fs/proc: fix uaf in proc_readdir_de()

Pde is erased from subdir rbtree through rb_erase(), but not set the node to EMPTY, which may result in uaf access. We should use RB_CLEAR_NODE() set the erased node to EMPTY, then pde_subdir_next() will return NULL to avoid uaf access.

We found an uaf issue while using stress-ng testing, need to run testcase getdent and tun in the same time. The steps of the issue is as follows:

1) use getdent to traverse dir /proc/pid/net/dev_snmp6/, and current pde is tun3;

2) in the [time windows] unregister netdevice tun3 and tun2, and erase them from rbtree. erase tun3 first, and then erase tun2. the pde(tun2) will be released to slab;

3) continue to getdent process, then pde_subdir_next() will return pde(tun2) which is released, it will case uaf access.

CPU 0 | CPU 1 ------------------------------------------------------------------------- traverse dir /proc/pid/net/dev_snmp6/ | unregister_netdevice(tun->dev) //tun3 tun2 sys_getdents64() | iterate_dir() | proc_readdir() | proc_readdir_de() | snmp6_unregister_dev() pde_get(de); | proc_remove() read_unlock(&proc_subdir_lock); | remove_proc_subtree() | write_lock(&proc_subdir_lock); [time window] | rb_erase(&root->subdir_node, &parent->subdir); | write_unlock(&proc_subdir_lock); read_lock(&proc_subdir_lock); | next = pde_subdir_next(de); | pde_put(de); | de = next; //UAF |

rbtree of dev_snmp6 | pde(tun3) / \ NULL pde(tun2)

Patch / fix

  • Linux Linux 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.59, 6.17.9, 6.18
  • Siemens RUGGEDCOM RST2428P V4.0
  • linux Debian 12 6.1.159-1
  • linux Debian 13 6.12.63-1
  • linux Debian 14 6.17.9-1

debian advisories DEBIAN-CVE-2025-40271

  • linux Ubuntu 22.04 LTS 5.15.0-173.183
  • linux Ubuntu 24.04 LTS 6.8.0-106.106
  • linux Ubuntu 25.10 6.17.0-14.14
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1103.110
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1050.53
  • linux-aws Ubuntu 25.10 6.17.0-1007.7
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1103.112
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1052.55

ubuntu advisories UBUNTU-CVE-2025-40271

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

  • kernel RHEL 9 5.14.0-611.30.1.el9_7
  • rv RHEL 9 5.14.0-611.30.1.el9_7
  • perf RHEL 9 5.14.0-611.30.1.el9_7
  • rtla RHEL 9 5.14.0-611.30.1.el9_7
  • libperf RHEL 9 5.14.0-611.30.1.el9_7
  • kernel-rt RHEL 9 5.14.0-611.30.1.el9_7
  • kernel-64k RHEL 9 5.14.0-611.30.1.el9_7
  • kernel-core RHEL 9 5.14.0-611.30.1.el9_7

red hat advisories RHSA-2026:3685RHSA-2026:3634RHSA-2026:3388RHSA-2026:3375RHSA-2026:3360RHSA-2026:3358

  • kernel-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-40.1
  • kernel-source-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-40.1
  • kernel-source Linux Micro 6.1, Linux Micro 6.0 6.4.0-39.1
  • kernel-default Linux Micro 6.1, Linux Micro 6.0 6.4.0-39.1
  • kernel-kvmsmall Linux Micro 6.1, Linux Micro 6.0 6.4.0-39.1
  • kernel-default-base Linux Micro 6.1, Linux Micro 6.0 6.4.0-39.1.21.16
  • kernel-rt Linux Micro 6.2 6.12.0-160000.9.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.9.1

suse advisories SUSE-SU-2026:20845-1SUSE-SU-2026:20876-1SUSE-SU-2026:20477-1SUSE-SU-2026:20498-1SUSE-SU-2026:0473-1SUSE-SU-2026:20207-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.9.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.9.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.9.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.9.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.9.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.9.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.9.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.9.1

opensuse advisories openSUSE-SU-2026:20145-1

  • kernel AlmaLinux 9 5.14.0-611.30.1.el9_7
  • rv AlmaLinux 9 5.14.0-611.30.1.el9_7
  • perf AlmaLinux 9 5.14.0-611.30.1.el9_7
  • rtla AlmaLinux 9 5.14.0-611.30.1.el9_7
  • libperf AlmaLinux 9 5.14.0-611.30.1.el9_7
  • kernel-rt AlmaLinux 9 5.14.0-611.30.1.el9_7
  • kernel-64k AlmaLinux 9 5.14.0-611.30.1.el9_7
  • kernel-core AlmaLinux 9 5.14.0-611.30.1.el9_7

almalinux advisories ALSA-2026:2212ALSA-2026:1661ALSA-2026:1662ALSA-2026:1690

  • kernel Rocky Linux 9 5.14.0-611.30.1.el9_7
  • kernel-rt Rocky Linux 8 4.18.0-553.100.1.rt7.441.el8_10
  • kernel Rocky Linux 8 4.18.0-553.100.1.el8_10
  • kernel Rocky Linux 10 6.12.0-124.31.1.el10_1

rocky linux advisories RLSA-2026:2212RLSA-2026:1661RLSA-2026:1662RLSA-2026:1690

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-2025-40271 updated cvss 7.0

kernel: Linux kernel: Use-after-free in proc_readdir_de() can lead to privilege escalation or denial of service.

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.111.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.111.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.111.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.111.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.111.1.el9_4
    fixed: vendor fix RHSA-2026:2766
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.89.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.89.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.89.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.89.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.89.1.el9_6
    fixed: vendor fix RHSA-2026:2759
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.30.1.el9_7, perf 5.14.0-611.30.1.el9_7, rtla 5.14.0-611.30.1.el9_7, python3-perf 5.14.0-611.30.1.el9_7, kernel-devel-matched 5.14.0-611.30.1.el9_7, kernel-64k-devel-matched 5.14.0-611.30.1.el9_7, +7 more
    fixed: vendor fix RHSA-2026:2212
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.31.1.el10_1, perf 6.12.0-124.31.1.el10_1, rtla 6.12.0-124.31.1.el10_1, python3-perf 6.12.0-124.31.1.el10_1, kernel-devel-matched 6.12.0-124.31.1.el10_1, kernel-64k-devel-matched 6.12.0-124.31.1.el10_1, +7 more
    fixed: vendor fix RHSA-2026:1690
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.167.1.el9_0, kernel-devel-matched 5.14.0-70.167.1.el9_0, kernel-debug-devel-matched 5.14.0-70.167.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.167.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.167.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.167.1.el9_0, +2 more
    fixed: vendor fix RHSA-2026:3293
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.158.1.el9_2, rtla 5.14.0-284.158.1.el9_2, kernel-devel-matched 5.14.0-284.158.1.el9_2, kernel-64k-devel-matched 5.14.0-284.158.1.el9_2, kernel-debug-devel-matched 5.14.0-284.158.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.158.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:3267
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.60.1.el10_0, perf 6.12.0-55.60.1.el10_0, rtla 6.12.0-55.60.1.el10_0, python3-perf 6.12.0-55.60.1.el10_0, kernel-devel-matched 6.12.0-55.60.1.el10_0, kernel-64k-devel-matched 6.12.0-55.60.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:2761
show 31 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.111.1.el9_4, perf 5.14.0-427.111.1.el9_4, rtla 5.14.0-427.111.1.el9_4, kernel-devel-matched 5.14.0-427.111.1.el9_4, kernel-64k-devel-matched 5.14.0-427.111.1.el9_4, kernel-debug-devel-matched 5.14.0-427.111.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:2766
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.89.1.el9_6, perf 5.14.0-570.89.1.el9_6, rtla 5.14.0-570.89.1.el9_6, python3-perf 5.14.0-570.89.1.el9_6, kernel-devel-matched 5.14.0-570.89.1.el9_6, kernel-64k-devel-matched 5.14.0-570.89.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:2759
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.100.1.el8_10, kernel 4.18.0-553.100.1.el8_10, bpftool 4.18.0-553.100.1.el8_10, kernel-core 4.18.0-553.100.1.el8_10, kernel-tools 4.18.0-553.100.1.el8_10, python3-perf 4.18.0-553.100.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:1662
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.30.1.el9_7, kernel-64k 5.14.0-611.30.1.el9_7, kernel-core 5.14.0-611.30.1.el9_7, kernel-tools 5.14.0-611.30.1.el9_7, kernel-modules 5.14.0-611.30.1.el9_7, kernel-64k-core 5.14.0-611.30.1.el9_7, +27 more
    fixed: vendor fix RHSA-2026:2212
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.31.1.el10_1, kernel-64k 6.12.0-124.31.1.el10_1, kernel-core 6.12.0-124.31.1.el10_1, kernel-tools 6.12.0-124.31.1.el10_1, kernel-modules 6.12.0-124.31.1.el10_1, kernel-64k-core 6.12.0-124.31.1.el10_1, +28 more
    fixed: vendor fix RHSA-2026:1690
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.187.1.el8_2, kernel 4.18.0-193.187.1.el8_2, bpftool 4.18.0-193.187.1.el8_2, kernel-core 4.18.0-193.187.1.el8_2, kernel-tools 4.18.0-193.187.1.el8_2, python3-perf 4.18.0-193.187.1.el8_2, +8 more
    fixed: vendor fix RHSA-2026:3388
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.186.1.el8_4, kernel 4.18.0-305.186.1.el8_4, bpftool 4.18.0-305.186.1.el8_4, kernel-core 4.18.0-305.186.1.el8_4, kernel-tools 4.18.0-305.186.1.el8_4, python3-perf 4.18.0-305.186.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:3360
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.181.1.el8_6, kernel 4.18.0-372.181.1.el8_6, bpftool 4.18.0-372.181.1.el8_6, kernel-core 4.18.0-372.181.1.el8_6, kernel-tools 4.18.0-372.181.1.el8_6, python3-perf 4.18.0-372.181.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.181.1.el8_6, kernel 4.18.0-372.181.1.el8_6, bpftool 4.18.0-372.181.1.el8_6, kernel-core 4.18.0-372.181.1.el8_6, kernel-tools 4.18.0-372.181.1.el8_6, python3-perf 4.18.0-372.181.1.el8_6, +15 more
    fixed: vendor fix RHSA-2026:3268
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.130.1.el8_8, kernel 4.18.0-477.130.1.el8_8, bpftool 4.18.0-477.130.1.el8_8, kernel-core 4.18.0-477.130.1.el8_8, kernel-tools 4.18.0-477.130.1.el8_8, python3-perf 4.18.0-477.130.1.el8_8, +9 more
    fixed: vendor fix RHSA-2026:3277
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.167.1.el9_0, bpftool 5.14.0-70.167.1.el9_0, kernel-core 5.14.0-70.167.1.el9_0, kernel-tools 5.14.0-70.167.1.el9_0, python3-perf 5.14.0-70.167.1.el9_0, kernel-modules 5.14.0-70.167.1.el9_0, +14 more
    fixed: vendor fix RHSA-2026:3293
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.158.1.el9_2, kernel 5.14.0-284.158.1.el9_2, kernel-64k 5.14.0-284.158.1.el9_2, kernel-core 5.14.0-284.158.1.el9_2, kernel-tools 5.14.0-284.158.1.el9_2, python3-perf 5.14.0-284.158.1.el9_2, +28 more
    fixed: vendor fix RHSA-2026:3267
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.60.1.el10_0, kernel-64k 6.12.0-55.60.1.el10_0, kernel-core 6.12.0-55.60.1.el10_0, kernel-tools 6.12.0-55.60.1.el10_0, kernel-modules 6.12.0-55.60.1.el10_0, kernel-64k-core 6.12.0-55.60.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:2761
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.111.1.el9_4, kernel 5.14.0-427.111.1.el9_4, kernel-64k 5.14.0-427.111.1.el9_4, kernel-core 5.14.0-427.111.1.el9_4, kernel-tools 5.14.0-427.111.1.el9_4, python3-perf 5.14.0-427.111.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:2766
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.89.1.el9_6, kernel-64k 5.14.0-570.89.1.el9_6, kernel-core 5.14.0-570.89.1.el9_6, kernel-tools 5.14.0-570.89.1.el9_6, kernel-modules 5.14.0-570.89.1.el9_6, kernel-64k-core 5.14.0-570.89.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:2759
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.186.1.el8_4, kernel 4.18.0-305.186.1.el8_4, bpftool 4.18.0-305.186.1.el8_4, kernel-core 4.18.0-305.186.1.el8_4, kernel-tools 4.18.0-305.186.1.el8_4, python3-perf 4.18.0-305.186.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:3360
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.181.1.el8_6, kernel 4.18.0-372.181.1.el8_6, bpftool 4.18.0-372.181.1.el8_6, kernel-core 4.18.0-372.181.1.el8_6, kernel-tools 4.18.0-372.181.1.el8_6, python3-perf 4.18.0-372.181.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:3268
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.130.1.el8_8, kernel 4.18.0-477.130.1.el8_8, bpftool 4.18.0-477.130.1.el8_8, kernel-core 4.18.0-477.130.1.el8_8, kernel-tools 4.18.0-477.130.1.el8_8, python3-perf 4.18.0-477.130.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:3277
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.30.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-611.30.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-611.30.1.el9_7, kernel-debuginfo-common-aarch64 5.14.0-611.30.1.el9_7, kernel-debuginfo-common-ppc64le 5.14.0-611.30.1.el9_7
    fixed: vendor fix RHSA-2026:2212
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.31.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-124.31.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-124.31.1.el10_1, kernel-debuginfo-common-aarch64 6.12.0-124.31.1.el10_1, kernel-debuginfo-common-ppc64le 6.12.0-124.31.1.el10_1
    fixed: vendor fix RHSA-2026:1690
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.60.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.60.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.60.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.60.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.60.1.el10_0
    fixed: vendor fix RHSA-2026:2761
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.100.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.100.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.100.1.el8_10
    fixed: vendor fix RHSA-2026:1662
  • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt 3.10.0-1160.147.1.rt56.1299.el7, kernel-rt-trace 3.10.0-1160.147.1.rt56.1299.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.147.1.rt56.1299.el7
    fixed: vendor fix RHSA-2026:3634
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.100.1.rt7.441.el8_10, kernel-rt-kvm 4.18.0-553.100.1.rt7.441.el8_10, kernel-rt-core 4.18.0-553.100.1.rt7.441.el8_10, kernel-rt-modules 4.18.0-553.100.1.rt7.441.el8_10, kernel-rt-debug-kvm 4.18.0-553.100.1.rt7.441.el8_10, kernel-rt-debug-core 4.18.0-553.100.1.rt7.441.el8_10, +3 more
    fixed: vendor fix RHSA-2026:1661
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-kvm 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-core 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-modules 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-debug-kvm 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-debug-core 5.14.0-70.167.1.rt21.239.el9_0, +4 more
    fixed: vendor fix RHSA-2026:3375
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.30.1.el9_7, kernel-rt-64k 5.14.0-611.30.1.el9_7, kernel-rt-core 5.14.0-611.30.1.el9_7, kernel-rt-modules 5.14.0-611.30.1.el9_7, kernel-rt-64k-core 5.14.0-611.30.1.el9_7, kernel-rt-debug-core 5.14.0-611.30.1.el9_7, +14 more
    fixed: vendor fix RHSA-2026:2212
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.31.1.el10_1, kernel-rt-64k 6.12.0-124.31.1.el10_1, kernel-rt-core 6.12.0-124.31.1.el10_1, kernel-rt-modules 6.12.0-124.31.1.el10_1, kernel-rt-64k-core 6.12.0-124.31.1.el10_1, kernel-rt-debug-core 6.12.0-124.31.1.el10_1, +14 more
    fixed: vendor fix RHSA-2026:1690
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-core 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-modules 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-debug-core 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-debug-modules 5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-modules-extra 5.14.0-70.167.1.rt21.239.el9_0, +2 more
    fixed: vendor fix RHSA-2026:3375
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-core 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-modules 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-debug-core 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-modules-core 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-debug-modules 5.14.0-284.158.1.rt14.443.el9_2, +4 more
    fixed: vendor fix RHSA-2026:3358
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.60.1.el10_0, kernel-rt-64k 6.12.0-55.60.1.el10_0, kernel-rt-core 6.12.0-55.60.1.el10_0, kernel-rt-modules 6.12.0-55.60.1.el10_0, kernel-rt-64k-core 6.12.0-55.60.1.el10_0, kernel-rt-debug-core 6.12.0-55.60.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:2761
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.111.1.el9_4, kernel-rt-core 5.14.0-427.111.1.el9_4, kernel-rt-modules 5.14.0-427.111.1.el9_4, kernel-rt-debug-core 5.14.0-427.111.1.el9_4, kernel-rt-modules-core 5.14.0-427.111.1.el9_4, kernel-rt-debug-modules 5.14.0-427.111.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:2766
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.89.1.el9_6, kernel-rt-64k 5.14.0-570.89.1.el9_6, kernel-rt-core 5.14.0-570.89.1.el9_6, kernel-rt-modules 5.14.0-570.89.1.el9_6, kernel-rt-64k-core 5.14.0-570.89.1.el9_6, kernel-rt-debug-core 5.14.0-570.89.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:2759

9 more fixed, 3 more not affected in the full advisory

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

Timeline

  1. Published
  2. First public exploit (EDB-52550)

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-52550 Linux Kernel proc_readdir_de() 6.18-rc5 - Local Privilege Escalation local, 2026-05-04

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

Affected products

  • Linux Linux
  • Siemens RUGGEDCOM RST2428P

Classification

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.