{"id":"CVE-2026-89839","published":"2026-09-16T11:16:50.727","lastModified":"2026-09-16T11:16:50.727","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: use the mount idmap for the owner check in f2fs_xattr_advise_set()\n\nf2fs_xattr_advise_set() calls inode_owner_or_capable() with &nop_mnt_idmap\nbefore allowing the \"system.advise\" xattr to be set, instead of the idmap\nthat the VFS passes to the ->set() handler.\n\nf2fs supports idmapped mounts, so on such a mount this checks the caller's\nfsuid against the unmapped on-disk owner rather than the mapped owner: the\nactual owner can be wrongly denied with -EPERM and an unrelated caller\nwrongly allowed.  Pass the handler's idmap instead.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/3b681229e9f8fb1dd29bc65983bf3c87779e4ca3","tags":[]},{"url":"https://git.kernel.org/stable/c/4c0c610b480cfbc57528aa1acbd6be12ed2a6fb1","tags":[]},{"url":"https://git.kernel.org/stable/c/a54ffce4637acb0db8e695188a6c7f99f14c3576","tags":[]},{"url":"https://git.kernel.org/stable/c/ab31e3b774f5d06b4489cef6c297b48c47c9dcbd","tags":[]},{"url":"https://git.kernel.org/stable/c/c3e2692c7a58e0bdb84bd658d827e89dcecea3ad","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}