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VulnerabilityPublished Updated

CVE-2025-71123: Linux kernel · ext4: fix string copying in parse_apply_sb_mount_options()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ee5a977b4e771cc181f39d504426dbd31ed701cc : update Linux kernel when convenient.

Data as of 10 Nov 2026, 13:17 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
Patch
Available – fixed in ee5a977b4e771cc181f39d504426dbd31ed701cc, db9ee13fab0267eccf6544ee35b16c9522db9aac, 902ca2356f1e3ec5355c5808ad5d3f9d0095b0cc +9

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Jan 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • >=5.10.246 <5.10.248
  • >=6.1.158 <6.1.160
  • >=6.6.114 <6.6.120
  • >=6.12.54 <6.12.64
  • >=5.4.301 <5.5
  • >=6.17.4 <6.18
Fixed in
  • ee5a977b4e771cc181f39d504426dbd31ed701cc
  • db9ee13fab0267eccf6544ee35b16c9522db9aac
  • 902ca2356f1e3ec5355c5808ad5d3f9d0095b0cc
  • 52ac96c4a2dd7bc47666000440b0602d9742e820
  • 6e37143560e37869d51b7d9e0ac61fc48895f8a0
  • 6.18
  • 6.12.64
  • 6.6.120
  • 6.1.160
  • 5bbacbbf1ca4419861dca3c6b82707c10e9c021c
  • 5.10.248
  • 5.5
LinuxLinuxAffected
  • =6.18
Fixed in–

AI-suggested

A fix for this vulnerability is available and has been incorporated into Linux kernel versions 5.10.248, 6.1.160, 6.6.120, 6.12.64, 6.18, and later. Users should upgrade to one of these fixed kernel versions to mitigate the issue. The patch ensures proper string copying and validation of mount options to prevent buffer overflow warnings. No additional mitigation steps are required beyond applying the official kernel updates.

Description

CVE-2025-71123 addresses a vulnerability in the Linux kernel's ext4 filesystem code, specifically in the parse_apply_sb_mount_options() function. The issue arises from improper use of strscpy_pad() to copy a non-NUL-terminated string into a NUL-terminated buffer, which can lead to a buffer overflow warning. The flaw was identified by the Linux Verification Center using Syzkaller. The fix involves ensuring the buffer size matches the expected input and returning an error if a non-NUL-terminated string is provided.

References

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