{"id":"CVE-2026-89839","title":"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…","summary":"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…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 01beba7957a26f9b7179127e8ad56bb5a0f56138 < 4c0c610b480cfbc57528aa1acbd6be12ed2a6fb1","Linux >= 01beba7957a26f9b7179127e8ad56bb5a0f56138 < c3e2692c7a58e0bdb84bd658d827e89dcecea3ad","Linux >= 01beba7957a26f9b7179127e8ad56bb5a0f56138 < 3b681229e9f8fb1dd29bc65983bf3c87779e4ca3","Linux >= 01beba7957a26f9b7179127e8ad56bb5a0f56138 < ab31e3b774f5d06b4489cef6c297b48c47c9dcbd","Linux >= 01beba7957a26f9b7179127e8ad56bb5a0f56138 < a54ffce4637acb0db8e695188a6c7f99f14c3576","Linux 6.3"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T11:16:50.727","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89839","references":[{"url":"https://git.kernel.org/stable/c/3b681229e9f8fb1dd29bc65983bf3c87779e4ca3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4c0c610b480cfbc57528aa1acbd6be12ed2a6fb1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a54ffce4637acb0db8e695188a6c7f99f14c3576","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ab31e3b774f5d06b4489cef6c297b48c47c9dcbd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c3e2692c7a58e0bdb84bd658d827e89dcecea3ad","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:53.997Z","epss":0.002,"epssPercentile":0.10166,"slug":"CVE-2026-89839","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}