CVE-2026-89839
Description
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.
How to fix
- Linux Linux4c0c610b480cfbc57528aa1acbd6be12ed2a6fb1, c3e2692c7a58e0bdb84bd658d827e89dcecea3ad, 3b681229e9f8fb1dd29bc65983bf3c87779e4ca3, ab31e3b774f5d06b4489cef6c297b48c47c9dcbd, a54ffce4637acb0db8e695188a6c7f99f14c3576 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 01beba7957a26f9b7179127e8ad56bb5a0f56138 ≤ v < 4c0c610b480cfbc57528aa1acbd6be12ed2a6fb1, 01beba7957a26f9b7179127e8ad56bb5a0f56138 ≤ v < c3e2692c7a58e0bdb84bd658d827e89dcecea3ad, 01beba7957a26f9b7179127e8ad56bb5a0f56138 ≤ v < 3b681229e9f8fb1dd29bc65983bf3c87779e4ca3, 01beba7957a26f9b7179127e8ad56bb5a0f56138 ≤ v < ab31e3b774f5d06b4489cef6c297b48c47c9dcbd, 01beba7957a26f9b7179127e8ad56bb5a0f56138 ≤ v < a54ffce4637acb0db8e695188a6c7f99f14c3576, 6.3 | 4c0c610b480cfbc57528aa1acbd6be12ed2a6fb1, c3e2692c7a58e0bdb84bd658d827e89dcecea3ad, 3b681229e9f8fb1dd29bc65983bf3c87779e4ca3, ab31e3b774f5d06b4489cef6c297b48c47c9dcbd, a54ffce4637acb0db8e695188a6c7f99f14c3576 |
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