Use-after-free in Linux kernel - CVE-2026-89951
Published: September 17, 2026
Vulnerability identifier: #VU150333
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89951
CWE-ID: CWE-416
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise confidentiality, integrity, and availability.
The vulnerability exists due to use-after-free in batadv_batman_skb_recv() when processing reassembled fragmented packets. A remote attacker can send fragmented packets to compromise confidentiality, integrity, and availability.
Exploitation requires a hard interface to be deleted before fragment reassembly completes.
Affected software
Linux kernel
How to mitigate CVE-2026-89951
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/2dffc8c44b6e3347b3719c6419c07b4a18fea895
- https://git.kernel.org/stable/c/63d86250fa7cbe22451369bd1c0881dfc8190958
- https://git.kernel.org/stable/c/6df64825f8b199921120c685af2abca14b077331
- https://git.kernel.org/stable/c/a2c272da99c2077088083c14961cf2f1e4506995
- https://git.kernel.org/stable/c/ad46c907d7d9975a285c1e89a4adde652eaa93f5
- https://git.kernel.org/stable/c/e91d2cc7441d89a45bad73ad9789159c7441cb80
- https://git.kernel.org/stable/c/f4b4ae763b5d59319fad62a00c76676758e7dafa
- https://git.kernel.org/stable/c/f830c2dfc1431764db9256b3d5db1695fc9a7f56