Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: xfs: fix cursor and pointer handling when recovering iunlink buckets LOLLM pointed out a bug in xlog_recover_iunlink_bucket: 1. We don't null out prev_ip after releasing it, which can lead to UAF problems if the inodegc flush call in the loop fails. at which point I noticed even more bugs: 2. If the inodegc flush inside the loop fails, we also leak @ip. 3. We set prev_agino to agino having already advanced agino, which results in inodes with i_prev_unlinked set to itself. 4. If we exit the bottom of the loop with prev_ip set, then prev_ip aliases ip and we also set its i_prev_unlinked to itself. Bugs 3 and 4 introduce loops into the unlinked list, though these loops don't surface because we immediately flush each unlinked inode after loading it. Fix all of these issues.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 04755d2e5821b3afbaadd09fe5df58d04de36484 before 47a948ba653a463d429e02fda2f06a3d6b78666d; affected 04755d2e5821b3afbaadd09fe5df58d04de36484 before 8c9d5b8a96d6b93eb24e07b4163c89341ba29bd1; affected 04755d2e5821b3afbaadd09fe5df58d04de36484 before 66a2179d02668f8df44b1a249899006f3ba38ea0; affected 04755d2e5821b3afbaadd09fe5df58d04de36484 before 961c717e6bf0e53c2c2b1fe4aef1add9390fedab; affected 04755d2e5821b3afbaadd09fe5df58d04de36484 before 65f39d09d73718611cee40399179323b5d4ead00 |
| Linux / Linux | affected 6.0; unaffected 0 before 6.0; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.18.55 through 6.18.*; unaffected 7.2.9 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/47a948ba653a463d429e02fda2f06a3d6b78666d
- https://git.kernel.org/stable/c/8c9d5b8a96d6b93eb24e07b4163c89341ba29bd1
- https://git.kernel.org/stable/c/66a2179d02668f8df44b1a249899006f3ba38ea0
- https://git.kernel.org/stable/c/961c717e6bf0e53c2c2b1fe4aef1add9390fedab
- https://git.kernel.org/stable/c/65f39d09d73718611cee40399179323b5d4ead00