---
cve: "CVE-2026-89826"
severity: "HIGH"
cvss: 7.1
epss: "23.6%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-09-16 11:16:49"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T08:45:35+02:00"
---

# CVE-2026-89826

> 7.1 HIGH

## Beschreibung

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

drm/panthor: harden firmware build-info bounds checks

panthor_fw_read_build_info() checks whether the metadata range fits in the
firmware image with hdr.meta_start + hdr.meta_size. Both fields are u32, so
the addition can wrap and let an out-of-bounds range pass validation.

The function also reads the "git_sha: " prefix without first checking that
the metadata is long enough, and meta_size == 0 can underflow the NULL
terminator index.

Use subtraction-based bounds checking and reject metadata that is too short
to contain the expected prefix and trailing NULL byte.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- Kernel ≥ 6.18.51
- Kernel ≥ 7.2.5

## Referenzen

- <https://git.kernel.org/stable/c/5516f1acfd07564361cf306cc90a8e513df0f096>
- <https://git.kernel.org/stable/c/6ae19dce3e8c13ae73590b3f4311abe9f96bbae8>
- <https://git.kernel.org/stable/c/8321b093fa6c297b80586460ce6914d9655df170>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-89826) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_