---
cve: "CVE-2026-80993"
severity: "LOW"
cvss: 3.1
epss: "17%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-09-11 20:19:06"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T04:12:13+02:00"
---

# CVE-2026-80993

> 3.1 LOW

## Beschreibung

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

net: phylink: correctly validate returned PCS in phylink_inband_caps

In phylink_inband_caps(), the PCS returned by mac_select_pcs is only
checked if NULL but mac_select_pcs can also return an error pointer.

This can cause a kernel panic as phylink_pcs_inband_caps() only checks
if passed PCS is not NULL and directly dereference ops from the phylink_pcs
struct.

Use the IS_ERR_OR_NULL macro to address both case where the returned
PCS can be NULL or an error pointer and prevent a kernel panic.

## Patch verfügbar (OSV)

- Kernel ≥ 6.18.50
- Kernel ≥ 7.2.4

## Referenzen

- <https://git.kernel.org/stable/c/b6b533f83461c3730875cf3ed5ff6362dcb67be9>
- <https://git.kernel.org/stable/c/fb4d77553841ae85bed9b2cf03351c401e871d85>
- <https://git.kernel.org/stable/c/f2849b1fd059ec9b3281b771e6ac5aad9feee851>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-80993) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_