{"id":"CVE-2026-90320","summary":"ocfs2: validate external xattr entries when reading metadata","details":"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 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","modified":"2026-09-19T03:47:28.891191258Z","published":"2026-09-17T16:08:37.497Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90320.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2cf82b46d5e43be0dfbaac7fa1073cec2fc1f5e6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9f4129b6905b7d638bbc9eb8013c3989cbe30b7e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90320.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90320"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"cf1d6c763fbcb115263114302485ad17e7933d87"},{"fixed":"9f4129b6905b7d638bbc9eb8013c3989cbe30b7e"},{"fixed":"2cf82b46d5e43be0dfbaac7fa1073cec2fc1f5e6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90320.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.28"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90320.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}