Description
In the Linux kernel, the following vulnerability has been resolved: fat: avoid parent link count underflow in rmdir Corrupted FAT images can leave a directory inode with an incorrect i_nlink (e.g. 2 even though subdirectories exist). rmdir then unconditionally calls drop_nlink(dir) and can drive i_nlink to 0, triggering the WARN_ON in drop_nlink(). Add a sanity check in vfat_rmdir() and msdos_rmdir(): only drop the parent link count when it is at least 3, otherwise report a filesystem error.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
9a53c3a783c2fa9b969628e65695c11c3e51e673 to < 7fe0de287e931e07cb96ecf1f449b2ebdb0e1115affected9a53c3a783c2fa9b969628e65695c11c3e51e673 to < 9894c79fd9466612d0514be157b5c30cd93aa645affected9a53c3a783c2fa9b969628e65695c11c3e51e673 to < cd569b87378b9c33ae13c23d6bb9d205d66f7c4baffected9a53c3a783c2fa9b969628e65695c11c3e51e673 to < d3b7ffa90f613938128432c7b2f35b7aa4bdd86baffected9a53c3a783c2fa9b969628e65695c11c3e51e673 to < 955c5d670b5ae07c78f4345e23a895638db96ce1affected9a53c3a783c2fa9b969628e65695c11c3e51e673 to < 17866f8a0822d414cb02e621cf003a7d04396ef8affected9a53c3a783c2fa9b969628e65695c11c3e51e673 to < d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0affected9a53c3a783c2fa9b969628e65695c11c3e51e673 to < 8cafcb881364af5ef3a8b9fed4db254054033d8aaffected
Linux Linux
Default version status: affected
2.6.19affected0 to < 2.6.19unaffected5.10.252 to ≤ 5.10.*unaffected5.15.202 to ≤ 5.15.*unaffected6.1.165 to ≤ 6.1.*unaffected6.6.128 to ≤ 6.6.*unaffected6.12.75 to ≤ 6.12.*unaffected6.18.14 to ≤ 6.18.*unaffected6.19.4 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/7fe0de287e931e07cb96ecf1f449b2ebdb0e1115 ↗
- https://git.kernel.org/stable/c/9894c79fd9466612d0514be157b5c30cd93aa645 ↗
- https://git.kernel.org/stable/c/cd569b87378b9c33ae13c23d6bb9d205d66f7c4b ↗
- https://git.kernel.org/stable/c/d3b7ffa90f613938128432c7b2f35b7aa4bdd86b ↗
- https://git.kernel.org/stable/c/955c5d670b5ae07c78f4345e23a895638db96ce1 ↗
- https://git.kernel.org/stable/c/17866f8a0822d414cb02e621cf003a7d04396ef8 ↗
- https://git.kernel.org/stable/c/d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0 ↗
- https://git.kernel.org/stable/c/8cafcb881364af5ef3a8b9fed4db254054033d8a ↗