# CVE-2026-90320: linux: In the Linux kernel, the following vulnerability has been resolved:  ocfs2: validate external xattr entries when read...

CVE-2026-90320 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-90320, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-90320
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 17, 2026

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-90320](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90320.md) | Sep 23, 2026 |
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-90320](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90320.md) | Sep 23, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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