Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 before 7fe0de287e931e07cb96ecf1f449b2ebdb0e1115; affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 before 9894c79fd9466612d0514be157b5c30cd93aa645; affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 before cd569b87378b9c33ae13c23d6bb9d205d66f7c4b; affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 before d3b7ffa90f613938128432c7b2f35b7aa4bdd86b; affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 before 955c5d670b5ae07c78f4345e23a895638db96ce1; affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 before 17866f8a0822d414cb02e621cf003a7d04396ef8; affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 before d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0; affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 before 8cafcb881364af5ef3a8b9fed4db254054033d8a |
| Linux / Linux | affected 2.6.19; unaffected 0 before 2.6.19; unaffected 5.10.252 through 5.10.*; unaffected 5.15.202 through 5.15.*; unaffected 6.1.165 through 6.1.*; unaffected 6.6.128 through 6.6.*; unaffected 6.12.75 through 6.12.*; unaffected 6.18.14 through 6.18.*; unaffected 6.19.4 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
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