Race condition in Linux kernel - CVE-2026-80784
Published: September 5, 2026
Vulnerability identifier: #VU147135
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80784
CWE-ID: CWE-362
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 a race condition in MPTCP path manager announcement and userspace local-address list allocation when processing concurrent userspace PM generic netlink ANNOUNCE requests during MPTCP socket teardown. A local user can issue concurrent ANNOUNCE requests while closing an MPTCP socket to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-80784
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/6c290915a03fc8228b473641025cf762b256dbd2
- https://git.kernel.org/stable/c/9fe5eebb664ecdba88f3fde18062d94b1d1c465f
- https://git.kernel.org/stable/c/b2a0b55bf613bd3e81ed26a847b0f6b8e6b7f804
- https://git.kernel.org/stable/c/bb32e9a6a9a9f99eeda16c4efe443400f3e43892
- https://git.kernel.org/stable/c/efc33b5102ff859bacd390a5f30112d8e0c084c0
- https://git.kernel.org/stable/c/f48341830e4202db3fe884b819b2db6740f0537d