CVE-2025-40198
In the Linux kernel, the following vulnerability has been resolved: ext4: avoid potential buffer over-read in parse_apply_sb_mount_options() Unlike other strings in the ext4 superblock, we rely on tune2fs to make sure s_mount_opts is NUL terminated. Harden parse_apply_sb_mount_options() by treating s_mount_opts as a potential __nonstring.
Affected versions
Linux kernel versions
2.6.36
and later are affected. Fixed in
5.4.301,
5.10.246,
6.1.158,
6.6.114,
6.12.54,
6.17.4,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40198 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/01829af7656b56d83682b3491265d583d502e502
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PatchKernel patch commithttps://git.kernel.org/stable/c/2a0cf438320cdb783e0378570744c0ef0d83e934
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PatchKernel patch commithttps://git.kernel.org/stable/c/7bf46ff83a0ef11836e38ebd72cdc5107209342d
Frequently asked questions
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What is CVE-2025-40198?
CVE-2025-40198 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 2.6.36 onward and has been patched in 5.4.301, 5.10.246, 6.1.158 and others. CVE-2025-40198 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40198?
Yes — CVE-2025-40198 has been patched. Fixed versions include 5.4.301, 5.10.246, 6.1.158 and others. If you are running Linux kernel 2.6.36 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40198 actively exploited?
No — CVE-2025-40198 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.