High 7.8Published Sep 17, 2026

CVE-2026-90320ocfs2: validate external xattr entries when reading metadata

Updated under an hour ago (2026-10-19 07:10 UTC)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: ocfs2: validate external xattr entries when reading metadata ocfs2_validate_xattr_block() checks the xattr block header before the block reaches higher-level xattr users, but it does not verify that a non-indexed block's xh_count and entry offsets fit inside the block. Indexed buckets likewise reach list/get consumers after ECC without an entry-bounds check. Use the flat xattr entry validator for non-indexed external xattr blocks, and use a bucket-specific validator for indexed buckets at metadata read time. The bucket validator keeps the entry array bounded by the first bucket block while checking name/value offsets against the bucket block they target. Reject corrupted external xattr metadata before listxattr() or getxattr() can walk out-of-range entry arrays or name/value offsets. Validation reproduced this kernel report: BUG: KASAN: use-after-free in ocfs2_xattr_list_entries+0xd7/0x190 Read of size 1 at addr ffff88810a654007 by task ocfs2_xattr_lis/630 Call Trace: dump_stack_lvl+0x66/0xa0 print_report+0xce/0x630 kasan_report+0xe0/0x110 ocfs2_xattr_list_entries+0xd7/0x190 ocfs2_listxattr+0x3f6/0x610 listxattr+0x90/0xe0 path_listxattrat+0xed/0x220 do_syscall_64+0x115/0x6a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Sep 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from cf1d6c763fbcb115263114302485ad17e7933d87 before 9f4129b6905b7d638bbc9eb8013c3989cbe30b7e; from cf1d6c763fbcb115263114302485ad17e7933d87 before 2cf82b46d5e43be0dfbaac7fa1073cec2fc1f5e6	CNA record

References

https://git.kernel.org/stable/c/9f4129b6905b7d638bbc9eb8013c3989cbe30b7e
https://git.kernel.org/stable/c/2cf82b46d5e43be0dfbaac7fa1073cec2fc1f5e6

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.