CVE-2026-89839
f2fs: use the mount idmap for the owner check in f2fs_xattr_advise_set()
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
In the Linux kernel, the following vulnerability has been resolved: f2fs: use the mount idmap for the owner check in f2fs_xattr_advise_set() f2fs_xattr_advise_set() calls inode_owner_or_capable() with &nop_mnt_idmap before allowing the "system.advise" xattr to be set, instead of the idmap that the VFS passes to the ->set() handler. f2fs supports idmapped mounts, so on such a mount this checks the caller's fsuid against the unmapped on-disk owner rather than the mapped owner: the actual owner can be wrongly denied with -EPERM and an unrelated caller wrongly allowed. Pass the handler's idmap instead.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 16, 2026 |
Stay Ahead of the Next One
Get instant alerts for linux linux
Be the first to know when new unknown vulnerabilities affecting linux linux are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
Affected Versions
Linux / Linux
01beba7957a26f9b7179127e8ad56bb5a0f56138 < 4c0c610b480cfbc57528aa1acbd6be12ed2a6fb1 01beba7957a26f9b7179127e8ad56bb5a0f56138 < c3e2692c7a58e0bdb84bd658d827e89dcecea3ad 01beba7957a26f9b7179127e8ad56bb5a0f56138 < 3b681229e9f8fb1dd29bc65983bf3c87779e4ca3 01beba7957a26f9b7179127e8ad56bb5a0f56138 < ab31e3b774f5d06b4489cef6c297b48c47c9dcbd 01beba7957a26f9b7179127e8ad56bb5a0f56138 < a54ffce4637acb0db8e695188a6c7f99f14c3576
Linux / Linux
6.3
References
git.kernel.org: https://git.kernel.org/stable/c/4c0c610b480cfbc57528aa1acbd6be12ed2a6fb1 git.kernel.org: https://git.kernel.org/stable/c/c3e2692c7a58e0bdb84bd658d827e89dcecea3ad git.kernel.org: https://git.kernel.org/stable/c/3b681229e9f8fb1dd29bc65983bf3c87779e4ca3 git.kernel.org: https://git.kernel.org/stable/c/ab31e3b774f5d06b4489cef6c297b48c47c9dcbd git.kernel.org: https://git.kernel.org/stable/c/a54ffce4637acb0db8e695188a6c7f99f14c3576