CVE-2025-71292

In the Linux kernel, the following vulnerability has been resolved: jfs: nlink overflow in jfs_rename If nlink is maximal for a directory (-1) and inside that directory you perform a rename for some child directory (not moving from the parent), then the nlink of the first directory is first incremented and later decremented. Normally this is fine, but when nlink = -1 this causes a wrap around to 0, and then drop_nlink issues a warning. After applying the patch syzbot no longer issues any warnings. I also ran some basic fs tests to look for any regressions.

CVSS 3.1

5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.3% chance of exploitation in the next 30 days; higher than 24% of CVEs (scores of 2026-10-25)

Published

2026-05-06

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/2108829a59f081e822fdab8c2cd7131deb8aa8a1
• https://git.kernel.org/stable/c/5d77c36cd4b698649f5c30c5f6c084f4f61d1880
• https://git.kernel.org/stable/c/9218dc26fd922b09858ecd3666ed57dfd8098da8
• https://git.kernel.org/stable/c/93c325746ae59709b4f9bad4e3e4761c8d566c70
• https://git.kernel.org/stable/c/a3d66089e50a6e0142f8884471f74292102ea9aa

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