Description
In the Linux kernel, the following vulnerability has been resolved:

ocfs2: validate DIO orphan slot during inode read

[BUG]
A corrupted append-DIO dinode (high byte at offset 0xa1
corrupted from 0 to 1) can carry an i_dio_orphaned_slot
outside the mounted filesystem slot range and trigger a
use-after-free error:

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_del_inode_from_orphan() uses i_dio_orphaned_slot to index the
slot-local system inode cache. The dinode validator does not check
this active slot, so an out-of-range value produces an invalid cache
entry pointer that is dereferenced as an inode pointer.

[FIX]
Reject an active i_dio_orphaned_slot outside the slot range during
dinode validation, before DIO orphan recovery can consume it.
Published: 2026-09-17
Score: 7.8 High
EPSS: < 1% Very Low
KEV: No
Impact: Use‑After‑Free leading to local privilege escalation or denial of service
Action: Patch
AI Analysis

Impact

A corrupted append‑DIO dinode in the Linux kernel’s OCFS2 filesystem can store an out‑of‑range i_dio_orphaned_slot value during ingestion. When the slot is later used for inode recovery, the kernel dereferences an invalid cache entry pointer, causing a use‑after‑free. The flaw results in memory corruption that could allow an attacker to corrupt kernel memory, potentially escalating privileges or crashing the system. The weakness is a use‑after‑free.

Affected Systems

The vulnerability affects the Linux kernel on any distribution that includes the OCFS2 filesystem. No specific version ranges are listed, so all kernel releases containing OCFS2 are potentially impacted.

Risk and Exploitability

The CVSS score of 7.8 indicates a high severity. The EPSS score is below 1 %, implying a low probability of exploitation at the time of assessment. The flaw is not listed in the CISA KEV catalog. Likely attack vectors require local write access to an OCFS2‑backed filesystem to create the corrupted dinode; therefore, the vulnerability may be exploitable by privileged or compromised local users rather than remote attackers.

Generated by OpenCVE AI on September 20, 2026 at 03:55 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade the Linux kernel to a revision that incorporates the OCFS2 use‑after‑free fix, ensuring the kernel code validates i_dio_orphaned_slot values during dinode validation.
  • If an immediate kernel update is not feasible, restrict write access to the affected OCFS2 filesystem or mount it read‑only for untrusted workloads to creation of corrupted dinodes.
  • Enable kernel memory‑corruption detection mechanisms such as KASAN or kmemleak and monitor system logs for related error messages to detect any residual issues promptly.

Generated by OpenCVE AI on September 20, 2026 at 03:55 UTC.

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History

Sun, 20 Sep 2026 04:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Sun, 20 Sep 2026 02:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Sat, 19 Sep 2026 03:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

Thu, 17 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: ocfs2: validate DIO orphan slot during inode read [BUG] A corrupted append-DIO dinode (high byte at offset 0xa1 corrupted from 0 to 1) can carry an i_dio_orphaned_slot outside the mounted filesystem slot range and trigger a use-after-free error: 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_del_inode_from_orphan() uses i_dio_orphaned_slot to index the slot-local system inode cache. The dinode validator does not check this active slot, so an out-of-range value produces an invalid cache entry pointer that is dereferenced as an inode pointer. [FIX] Reject an active i_dio_orphaned_slot outside the slot range during dinode validation, before DIO orphan recovery can consume it.
Title ocfs2: validate DIO orphan slot during inode read
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Subscriptions

Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-09-18T17:53:42.767Z

Reserved: 2026-09-11T19:38:34.792Z

Link: CVE-2026-90204

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-17T17:17:15.460

Modified: 2026-09-18T18:17:46.287

Link: CVE-2026-90204

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-20T04:00:09Z

Weaknesses