Description
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.
References6
- git.kernel.org/stable/c/47a948ba653a463d429e02fda2f06a3d6b78666d
- git.kernel.org/stable/c/65f39d09d73718611cee40399179323b5d4ead00
- git.kernel.org/stable/c/66a2179d02668f8df44b1a249899006f3ba38ea0
- git.kernel.org/stable/c/8c9d5b8a96d6b93eb24e07b4163c89341ba29bd1
- git.kernel.org/stable/c/8cfde7b2fb7288f4f6b90293e8702ff897c682fe
- git.kernel.org/stable/c/961c717e6bf0e53c2c2b1fe4aef1add9390fedab
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 10 November 2026
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