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Fencer Vulns
high 8.4

CVE-2025-22121 json

ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()

published 2025-04-16 18 mo ago modified 2026-10-15 24 d ago also EUVD-2025-11160

cvss
8.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

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

ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()

There's issue as follows: BUG: KASAN: use-after-free in ext4_xattr_inode_dec_ref_all+0x6ff/0x790 Read of size 4 at addr ffff88807b003000 by task syz-executor.0/15172

CPU: 3 PID: 15172 Comm: syz-executor.0 Call Trace: __dump_stack lib/dump_stack.c:82 [inline] dump_stack+0xbe/0xfd lib/dump_stack.c:123 print_address_description.constprop.0+0x1e/0x280 mm/kasan/report.c:400 __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560 kasan_report+0x3a/0x50 mm/kasan/report.c:585 ext4_xattr_inode_dec_ref_all+0x6ff/0x790 fs/ext4/xattr.c:1137 ext4_xattr_delete_inode+0x4c7/0xda0 fs/ext4/xattr.c:2896 ext4_evict_inode+0xb3b/0x1670 fs/ext4/inode.c:323 evict+0x39f/0x880 fs/inode.c:622 iput_final fs/inode.c:1746 [inline] iput fs/inode.c:1772 [inline] iput+0x525/0x6c0 fs/inode.c:1758 ext4_orphan_cleanup fs/ext4/super.c:3298 [inline] ext4_fill_super+0x8c57/0xba40 fs/ext4/super.c:5300 mount_bdev+0x355/0x410 fs/super.c:1446 legacy_get_tree+0xfe/0x220 fs/fs_context.c:611 vfs_get_tree+0x8d/0x2f0 fs/super.c:1576 do_new_mount fs/namespace.c:2983 [inline] path_mount+0x119a/0x1ad0 fs/namespace.c:3316 do_mount+0xfc/0x110 fs/namespace.c:3329 __do_sys_mount fs/namespace.c:3540 [inline] __se_sys_mount+0x219/0x2e0 fs/namespace.c:3514 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1

Memory state around the buggy address: ffff88807b002f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807b002f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807b003000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88807b003080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88807b003100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

Above issue happens as ext4_xattr_delete_inode() isn't check xattr is valid if xattr is in inode. To solve above issue call xattr_check_inode() check if xattr if valid in inode. In fact, we can directly verify in ext4_iget_extra_inode(), so that there is no divergent verification.

Patch / fix

  • Linux Linux 5.10.248, 5.15.198, 6.1.161, 6.6.120, 6.12.59, 6.14.2, 6.15
  • linux Debian 12 6.1.162-1
  • linux Debian 13 6.12.63-1
  • linux Debian 14 6.16.3-1

debian advisories DEBIAN-CVE-2025-22121

  • linux Ubuntu 22.04 LTS 5.15.0-173.183
  • linux Ubuntu 24.04 LTS 6.8.0-106.106
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1103.110
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1050.53
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1103.112
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1052.55
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1099.105
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1048.53

ubuntu advisories UBUNTU-CVE-2025-22121

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 5.14.0-570.30.1.el9_6
  • rv RHEL 9 5.14.0-570.30.1.el9_6
  • perf RHEL 9 5.14.0-570.30.1.el9_6
  • rtla RHEL 9 5.14.0-570.30.1.el9_6
  • libperf RHEL 9 5.14.0-570.30.1.el9_6
  • kernel-rt RHEL 9 5.14.0-570.30.1.el9_6
  • kernel-64k RHEL 9 5.14.0-570.30.1.el9_6
  • kernel-core RHEL 9 5.14.0-570.30.1.el9_6

red hat advisories RHSA-2025:11861RHSA-2025:11855RHSA-2025:11571RHSA-2025:11572RHSA-2025:11245RHSA-2025:10830

  • kernel-64kb SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS, Enterprise Storage 7.1 5.3.18-150300.59.207.1
  • kernel-syms SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.207.1
  • kernel-source SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.207.1
  • kernel-default SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +5 more 5.3.18-150300.59.207.1
  • kernel-preempt SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.207.1
  • kernel-obs-build SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.207.1
  • kernel-default-base SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +3 more 5.3.18-150300.59.207.1.150300.18.124.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.3.1

suse advisories SUSE-SU-2025:01982-1SUSE-SU-2025:01967-1SUSE-SU-2025:01964-1SUSE-SU-2025:01951-1SUSE-SU-2025:01919-1SUSE-SU-2025:01707-1

  • kernel-abi-stablelists AlmaLinux 10 6.12.0-55.24.1.el10_0
  • kernel AlmaLinux 9 5.14.0-570.30.1.el9_6
  • rv AlmaLinux 9 5.14.0-570.30.1.el9_6
  • perf AlmaLinux 9 5.14.0-570.30.1.el9_6
  • rtla AlmaLinux 9 5.14.0-570.30.1.el9_6
  • libperf AlmaLinux 9 5.14.0-570.30.1.el9_6
  • kernel-rt AlmaLinux 9 5.14.0-570.30.1.el9_6
  • kernel-64k AlmaLinux 9 5.14.0-570.30.1.el9_6

almalinux advisories ALSA-2025:11855ALSA-2025:11861

  • kernel Rocky Linux 9 5.14.0-570.30.1.el9_6
  • kernel Rocky Linux 10 6.12.0-55.24.1.el10_0

rocky linux advisories RLSA-2025:11861RLSA-2025:11855

  • kernel Azure Linux 3.0 6.6.121.1-1

azure linux advisories AZL-62660

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-2025-22121 updated cvss 7.1

kernel: ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()

  • 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 Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    affected: no fix planned “Out of support scope”
  • 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: no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.77.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.77.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.77.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.77.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.77.1.el9_4
    fixed: vendor fix RHSA-2025:11245
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-570.30.1.el9_6, perf 5.14.0-570.30.1.el9_6, rtla 5.14.0-570.30.1.el9_6, python3-perf 5.14.0-570.30.1.el9_6, kernel-devel-matched 5.14.0-570.30.1.el9_6, kernel-64k-devel-matched 5.14.0-570.30.1.el9_6, +7 more
    fixed: vendor fix RHSA-2025:11861
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-55.24.1.el10_0, perf 6.12.0-55.24.1.el10_0, rtla 6.12.0-55.24.1.el10_0, python3-perf 6.12.0-55.24.1.el10_0, kernel-devel-matched 6.12.0-55.24.1.el10_0, kernel-64k-devel-matched 6.12.0-55.24.1.el10_0, +7 more
    fixed: vendor fix RHSA-2025:11855
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.138.1.el9_0, kernel-devel-matched 5.14.0-70.138.1.el9_0, kernel-debug-devel-matched 5.14.0-70.138.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.138.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.138.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.138.1.el9_0, +2 more
    fixed: vendor fix RHSA-2025:10830
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.126.1.el9_2, rtla 5.14.0-284.126.1.el9_2, kernel-devel-matched 5.14.0-284.126.1.el9_2, kernel-64k-devel-matched 5.14.0-284.126.1.el9_2, kernel-debug-devel-matched 5.14.0-284.126.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.126.1.el9_2, +5 more
    fixed: vendor fix RHSA-2025:11571
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.77.1.el9_4, perf 5.14.0-427.77.1.el9_4, rtla 5.14.0-427.77.1.el9_4, kernel-devel-matched 5.14.0-427.77.1.el9_4, kernel-64k-devel-matched 5.14.0-427.77.1.el9_4, kernel-debug-devel-matched 5.14.0-427.77.1.el9_4, +6 more
    fixed: vendor fix RHSA-2025:11245
show 17 more
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.30.1.el9_6, kernel-64k 5.14.0-570.30.1.el9_6, kernel-core 5.14.0-570.30.1.el9_6, kernel-tools 5.14.0-570.30.1.el9_6, kernel-modules 5.14.0-570.30.1.el9_6, kernel-64k-core 5.14.0-570.30.1.el9_6, +27 more
    fixed: vendor fix RHSA-2025:11861
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-55.24.1.el10_0, kernel-64k 6.12.0-55.24.1.el10_0, kernel-core 6.12.0-55.24.1.el10_0, kernel-tools 6.12.0-55.24.1.el10_0, kernel-modules 6.12.0-55.24.1.el10_0, kernel-64k-core 6.12.0-55.24.1.el10_0, +27 more
    fixed: vendor fix RHSA-2025:11855
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.138.1.el9_0, bpftool 5.14.0-70.138.1.el9_0, kernel-core 5.14.0-70.138.1.el9_0, kernel-tools 5.14.0-70.138.1.el9_0, python3-perf 5.14.0-70.138.1.el9_0, kernel-modules 5.14.0-70.138.1.el9_0, +14 more
    fixed: vendor fix RHSA-2025:10830
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.126.1.el9_2, kernel 5.14.0-284.126.1.el9_2, kernel-64k 5.14.0-284.126.1.el9_2, kernel-core 5.14.0-284.126.1.el9_2, kernel-tools 5.14.0-284.126.1.el9_2, python3-perf 5.14.0-284.126.1.el9_2, +28 more
    fixed: vendor fix RHSA-2025:11571
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.77.1.el9_4, kernel 5.14.0-427.77.1.el9_4, kernel-64k 5.14.0-427.77.1.el9_4, kernel-core 5.14.0-427.77.1.el9_4, kernel-tools 5.14.0-427.77.1.el9_4, python3-perf 5.14.0-427.77.1.el9_4, +28 more
    fixed: vendor fix RHSA-2025:11245
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.30.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.30.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.30.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.30.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.30.1.el9_6
    fixed: vendor fix RHSA-2025:11861
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-55.24.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.24.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.24.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.24.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.24.1.el10_0
    fixed: vendor fix RHSA-2025:11855
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.138.1.rt21.210.el9_0, kernel-rt-kvm 5.14.0-70.138.1.rt21.210.el9_0, kernel-rt-core 5.14.0-70.138.1.rt21.210.el9_0, kernel-rt-modules 5.14.0-70.138.1.rt21.210.el9_0, kernel-rt-debug-kvm 5.14.0-70.138.1.rt21.210.el9_0, kernel-rt-debug-core 5.14.0-70.138.1.rt21.210.el9_0, +4 more
    fixed: vendor fix RHSA-2025:10829
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.30.1.el9_6, kernel-rt-64k 5.14.0-570.30.1.el9_6, kernel-rt-core 5.14.0-570.30.1.el9_6, kernel-rt-modules 5.14.0-570.30.1.el9_6, kernel-rt-64k-core 5.14.0-570.30.1.el9_6, kernel-rt-debug-core 5.14.0-570.30.1.el9_6, +14 more
    fixed: vendor fix RHSA-2025:11861
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-55.24.1.el10_0, kernel-rt-64k 6.12.0-55.24.1.el10_0, kernel-rt-core 6.12.0-55.24.1.el10_0, kernel-rt-modules 6.12.0-55.24.1.el10_0, kernel-rt-64k-core 6.12.0-55.24.1.el10_0, kernel-rt-debug-core 6.12.0-55.24.1.el10_0, +14 more
    fixed: vendor fix RHSA-2025:11855
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.138.1.rt21.210.el9_0, kernel-rt-core 5.14.0-70.138.1.rt21.210.el9_0, kernel-rt-modules 5.14.0-70.138.1.rt21.210.el9_0, kernel-rt-debug-core 5.14.0-70.138.1.rt21.210.el9_0, kernel-rt-debug-modules 5.14.0-70.138.1.rt21.210.el9_0, kernel-rt-modules-extra 5.14.0-70.138.1.rt21.210.el9_0, +2 more
    fixed: vendor fix RHSA-2025:10829
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.126.1.rt14.411.el9_2, kernel-rt-core 5.14.0-284.126.1.rt14.411.el9_2, kernel-rt-modules 5.14.0-284.126.1.rt14.411.el9_2, kernel-rt-debug-core 5.14.0-284.126.1.rt14.411.el9_2, kernel-rt-modules-core 5.14.0-284.126.1.rt14.411.el9_2, kernel-rt-debug-modules 5.14.0-284.126.1.rt14.411.el9_2, +4 more
    fixed: vendor fix RHSA-2025:11572
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.77.1.el9_4, kernel-rt-core 5.14.0-427.77.1.el9_4, kernel-rt-modules 5.14.0-427.77.1.el9_4, kernel-rt-debug-core 5.14.0-427.77.1.el9_4, kernel-rt-modules-core 5.14.0-427.77.1.el9_4, kernel-rt-debug-modules 5.14.0-427.77.1.el9_4, +4 more
    fixed: vendor fix RHSA-2025:11245
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-570.30.1.el9_6, kernel-rt-kvm 5.14.0-570.30.1.el9_6, kernel-rt-core 5.14.0-570.30.1.el9_6, kernel-rt-modules 5.14.0-570.30.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.30.1.el9_6, kernel-rt-debug-core 5.14.0-570.30.1.el9_6, +6 more
    fixed: vendor fix RHSA-2025:11861
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-55.24.1.el10_0, kernel-rt-kvm 6.12.0-55.24.1.el10_0, kernel-rt-core 6.12.0-55.24.1.el10_0, kernel-rt-modules 6.12.0-55.24.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.24.1.el10_0, kernel-rt-debug-core 6.12.0-55.24.1.el10_0, +6 more
    fixed: vendor fix RHSA-2025:11855
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.126.1.rt14.411.el9_2, kernel-rt-kvm 5.14.0-284.126.1.rt14.411.el9_2, kernel-rt-core 5.14.0-284.126.1.rt14.411.el9_2, kernel-rt-modules 5.14.0-284.126.1.rt14.411.el9_2, kernel-rt-debug-kvm 5.14.0-284.126.1.rt14.411.el9_2, kernel-rt-debug-core 5.14.0-284.126.1.rt14.411.el9_2, +6 more
    fixed: vendor fix RHSA-2025:11572
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.77.1.el9_4, kernel-rt-kvm 5.14.0-427.77.1.el9_4, kernel-rt-core 5.14.0-427.77.1.el9_4, kernel-rt-modules 5.14.0-427.77.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.77.1.el9_4, kernel-rt-debug-core 5.14.0-427.77.1.el9_4, +6 more
    fixed: vendor fix RHSA-2025:11245

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-26-295-11 updated cvss 8.4

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.7 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.7
    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-26-209-04 updated cvss 5.5

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.6 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.6
    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
none
Automatable
no
Technical impact
total
Assessed
24 d ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 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.