Use-after-free in Linux kernel - CVE-2026-72251
Published: August 16, 2026
Vulnerability identifier: #VU143190
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-72251
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in nf_nat_sip in net/netfilter/nf_nat_sip.c when handling cloned socket buffers during SIP NAT processing. A local user can trigger packet processing with a cloned skb to cause a denial of service.
The issue occurs in the reply-direction destination port mangling path for SIP traffic.
Affected software
Linux kernel
How to mitigate CVE-2026-72251
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/0e76e3e886cc9ee027337d5ad39cb96f57b7bdc7
- https://git.kernel.org/stable/c/2bcf2c5052fb5e73e255140ab43f056aef409c27
- https://git.kernel.org/stable/c/57e4e29644ec054d7021d296407e7ddd844afea2
- https://git.kernel.org/stable/c/77e43bcb7ec177e293a5c3f1b91a2c5aebfb6c68
- https://git.kernel.org/stable/c/bded21a4bf9bf86a79148be735723a97ca9a7532
- https://git.kernel.org/stable/c/dc11f26685aa850f237226f0f463647aea58ab7c
- https://git.kernel.org/stable/c/e38143c9b477f2968024c47c647dd4456a40aff1
- https://git.kernel.org/stable/c/eae9c6ccb5af69c713a65f8ae219f5c1aa32cd17