# CVE-2026-90205: ocfs2: validate orphan slot during inode read

CVE-2026-90205 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-90205, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-90205
- Priority: High
- CVSS: 7.8 (Moderate)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 17, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90205

## Description

In the Linux kernel, the following vulnerability has been resolved:  ocfs2: validate orphan slot during inode read  Patch series "ocfs2: validate active orphan slots during inode read".  OCFS2 trusts active ordinary and append-DIO orphan slots read from dinodes. A corrupted slot can therefore index osb_orphan_wipes or the slot-local system-inode cache outside their allocations before the corruption is reported.  Patch 1 validates the ordinary orphan slot used by inode wipe processing. Patch 2 validates the append-DIO orphan slot used by DIO completion and orphan recovery.  Both checks reject corrupt metadata at the existing inode validation boundary.   This patch (of 2):  [BUG] A corrupted dinode with OCFS2_ORPHANED_FL can carry an i_orphaned_slot outside the mounted filesystem slot range. ocfs2_wipe_inode() uses it to index osb_orphan_wipes before looking up the orphan directory, causing an out-of-bounds memory access.  BUG: KASAN: slab-use-after-free in ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102 Read of size 8 at addr ffff88800b767c00 by task kworker/u8:3/85 Call Trace:  ...  ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102  ocfs2_wipe_inode+0x292/0xf70 fs/ocfs2/inode.c:840  ocfs2_delete_inode fs/ocfs2/inode.c:1155 [inline]  ocfs2_evict_inode+0x6c9/0x1170 fs/ocfs2/inode.c:1295  evict+0x38e/0x8f0 fs/inode.c:810  iput_final fs/inode.c:1914 [inline]  iput fs/inode.c:1966 [inline]  iput+0x55b/0x8b0 fs/inode.c:1926  ocfs2_recover_orphans+0x610/0xe40 fs/ocfs2/journal.c:2374  ocfs2_complete_recovery+0x5af/0xd00 fs/ocfs2/journal.c:1373  ...  [CAUSE] ocfs2_validate_inode_block() validates i_suballoc_slot but leaves the active ordinary orphan slot unchecked. Downstream consumers assume that the value is smaller than osb->max_slots.  [FIX] Reject an active i_orphaned_slot outside the slot range during dinode validation, before the inode reaches orphan wipe processing.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-90205](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90205.md) | Sep 23, 2026 |
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-90205](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90205.md) | Sep 23, 2026 |

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Data as of 2026-11-08T06:59:42Z 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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