{"id":"CVE-2026-90320","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate external xattr entries when reading metadata\n\nocfs2_validate_xattr_block() checks the xattr block header before the\nblock reaches higher-level xattr use…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate external xattr entries when reading metadata\n\nocfs2_validate_xattr_block() checks the xattr block header before the\nblock reaches higher-level xattr use…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= cf1d6c763fbcb115263114302485ad17e7933d87 < 9f4129b6905b7d638bbc9eb8013c3989cbe30b7e","Linux >= cf1d6c763fbcb115263114302485ad17e7933d87 < 2cf82b46d5e43be0dfbaac7fa1073cec2fc1f5e6","Linux 2.6.28"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:53.563","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90320","references":[{"url":"https://git.kernel.org/stable/c/2cf82b46d5e43be0dfbaac7fa1073cec2fc1f5e6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9f4129b6905b7d638bbc9eb8013c3989cbe30b7e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00162,"epssPercentile":0.05835,"ingestedAt":"2026-09-17T16:21:47.823Z","slug":"CVE-2026-90320","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate external xattr entries when reading metadata\n\nocfs2_validate_xattr_block() checks the xattr block header before the\nblock reaches higher-level xattr users, but it does not verify that a\nnon-indexed block's xh_count and entry offsets fit inside the block. \nIndexed buckets likewise reach list/get consumers after ECC without an\nentry-bounds check.\n\nUse the flat xattr entry validator for non-indexed external xattr blocks,\nand use a bucket-specific validator for indexed buckets at metadata read\ntime.  The bucket validator keeps the entry array bounded by the first\nbucket block while checking name/value offsets against the bucket block\nthey target.\n\nReject corrupted external xattr metadata before listxattr() or getxattr()\ncan walk out-of-range entry arrays or name/value offsets.\n\nValidation reproduced this kernel report:\nBUG: KASAN: use-after-free in ocfs2_xattr_list_entries+0xd7/0x190\nRead of size 1 at addr ffff88810a654007 by task ocfs2_xattr_lis/630\nCall Trace:\n  dump_stack_lvl+0x66/0xa0\n  print_report+0xce/0x630\n  kasan_report+0xe0/0x110\n  ocfs2_xattr_list_entries+0xd7/0x190\n  ocfs2_listxattr+0x3f6/0x610\n  listxattr+0x90/0xe0\n  path_listxattrat+0xed/0x220\n  do_syscall_64+0x115/0x6a0\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":207251,"id":"CVE-2026-90320","ts":1789757339896,"field":"cvss","old":null,"new":"7.8"},{"seq":207250,"id":"CVE-2026-90320","ts":1789757339896,"field":"severity","old":"none","new":"high"}]}