high · 7.8

ocfs2: validate external xattr entries when reading metadata

CVE-2026-90320 · published 17 Sept 2026

How serious is it

  • Severity: high, CVSS score 7.8 out of 10.
  • No exploit prediction (EPSS) score yet.
  • Not on the CISA list of exploited vulnerabilities.
  • No public exploit in Exploit-DB.

Is your app affected by CVE-2026-90320?

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Who is affected

  • Linux Linux: cf1d6c763fbcb115263114302485ad17e7933d87 to < dc5778dbd0b6c411107a0e37e913a94b3c2f2728, cf1d6c763fbcb115263114302485ad17e7933d87 to < ee4ef26927e967ea699b3f0d7ecf97ce044fbc79, cf1d6c763fbcb115263114302485ad17e7933d87 to < 9f4129b6905b7d638bbc9eb8013c3989cbe30b7e, cf1d6c763fbcb115263114302485ad17e7933d87 to < 2cf82b46d5e43be0dfbaac7fa1073cec2fc1f5e6
  • Linux Linux: 2.6.28

How to check

  1. Find out whether you run the affected product and which version, then compare it with the versions above.

How to fix

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  1. Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
  2. If a vulnerable version was live, check your logs and rotate the secrets that server could read.

The advisory

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

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References

Merged from CVE List. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON

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