CVE-2025-40198
Published Nov 12, 2025
Modified Apr 15, 2026
Description
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.
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References
Other References
https://git.kernel.org/stable/c/01829af7656b56d83682b3491265d583d502e502
https://git.kernel.org/stable/c/2a0cf438320cdb783e0378570744c0ef0d83e934
https://git.kernel.org/stable/c/7bf46ff83a0ef11836e38ebd72cdc5107209342d
https://git.kernel.org/stable/c/8ecb790ea8c3fc69e77bace57f14cf0d7c177bd8
https://git.kernel.org/stable/c/a6e94557cd05adc82fae0400f6e17745563e5412
https://git.kernel.org/stable/c/b2bac84fde28fb6a88817b8b761abda17a1d300b
https://git.kernel.org/stable/c/e651294218d2684302ee5ed95ccf381646f3e5b4
Frequently Asked Questions
What is 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.
How do I check if I'm vulnerable to CVE-2025-40198? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.