---
cve: "CVE-2026-53043"
severity: "CRITICAL"
cvss: 9.1
epss: "51%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-06-24 17:17:16"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T11:56:28+02:00"
---

# CVE-2026-53043

> 9.1 CRITICAL

## Beschreibung

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

ocfs2/dlm: validate qr_numregions in dlm_match_regions()

Patch series "ocfs2/dlm: fix two bugs in dlm_match_regions()".

In dlm_match_regions(), the qr_numregions field from a DLM_QUERY_REGION
network message is used to drive loops over the qr_regions buffer without
sufficient validation.  This series fixes two issues:

- Patch 1 adds a bounds check to reject messages where qr_numregions
  exceeds O2NM_MAX_REGIONS. The o2net layer only validates message
  byte length; it does not constrain field values, so a crafted message
  can set qr_numregions up to 255 and trigger out-of-bounds reads past
  the 1024-byte qr_regions buffer.

- Patch 2 fixes an off-by-one in the local-vs-remote comparison loop,
  which uses '

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 5.10.258
- Kernel ≥ 5.15.209
- Kernel ≥ 6.1.175
- Kernel ≥ 6.6.141
- Kernel ≥ 6.12.91
- Kernel ≥ 6.18.33
- Kernel ≥ 7.0.10

## Referenzen

- <https://git.kernel.org/stable/c/d3d5efade0c79dac1cac98c0cb1115432f804439>
- <https://git.kernel.org/stable/c/f69551139caf6d24242a0ad049ee46b264e3aee0>
- <https://git.kernel.org/stable/c/1f8b91275912cd428289c1fb424bebd7ff5302bd>
- <https://git.kernel.org/stable/c/f37de46149db49abd2b24f4f0c5a88cf4dfb5f47>
- <https://git.kernel.org/stable/c/6c6e8fc3c007319981647b410c29bb5775048551>
- <https://git.kernel.org/stable/c/3f474c33ebc2e2ca3fcb587d7de4375348f13373>
- <https://git.kernel.org/stable/c/3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21>
- <https://git.kernel.org/stable/c/7ab3fbb01bc6d79091bc375e5235d360cd9b78be>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-53043) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_