High · published May 6, 2026
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.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 2.6.12.1, < 5.10.252 | 5.10.252 |
| linux/linux_kernel | ≥ 5.11, < 5.15.202 | 5.15.202 |
| linux/linux_kernel | ≥ 5.16, < 6.1.165 | 6.1.165 |
| linux/linux_kernel | ≥ 6.2, < 6.6.128 | 6.6.128 |
| linux/linux_kernel | ≥ 6.7, < 6.12.75 | 6.12.75 |
| linux/linux_kernel | ≥ 6.13, < 6.18.16 | 6.18.16 |
| linux/linux_kernel | ≥ 6.19, < 6.19.6 | 6.19.6 |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |