CVE-2026-89951

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89951

Key Details

CVE	CVE-2026-89951
CVSS Score / Version	8.8 (High) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is adjacent; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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

batman-adv: fix stale receive device on merged fragments

Fragment reassembly reuses the skb from the highest-numbered buffered

fragment as the merged packet. When that fragment was received on a hard

interface which is deleted before the chain completes, the merged skb can

re-enter the receive path with a stale skb->dev and skb_iif.

batadv_batman_skb_recv() passes such merged packets through the normal

receive handlers again. DAT and bridge loop avoidance both derive the ARP

header length from skb->dev, so they can dereference the freed net_device

before the packet reaches the local mesh interface.

Refresh the receive device metadata from the current receive device before

running the packet handlers. This keeps internally reinjected merged

fragments consistent with the normal receive path after hard interface

teardown. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89951
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89951

Source

Reference

NVD

CVE