CVE-2026-99218
In the Linux kernel, the following vulnerability has been resolved: coredump: hold RCU while releasing parked threads coredump_finish() releases the parked thr…
Impact
In the Linux kernel, the following vulnerability has been resolved: coredump: hold RCU while releasing parked threads coredump_finish() releases the parked threads by clearing ->task in their core_thread entry and calling wake_up_process() on each of them. It does that without holding a reference on the task and without being inside rcu. But calling wake_up_process(task) without rcu here isn't safe. A parked thread doesn't need that wakeup to leave. A spurious wakeup or a preemption after the store is enough for the task to go away. So if the coredump client is preempted between the store and wake_up_process() the thread can exit and be freed in the meantime and try_to_wake_up() takes pi_lock in freed memory. Hold rcu across the loop.
An attacker can exploit this with local access to the system, with a regular user account, without any action by a user. Specific conditions have to be met, which makes an attack harder. If it succeeds: high risk of data being read, high risk of data or systems being changed, high risk of outages.
Affected products · Linux
| Product | Affected versions |
|---|---|
| Linux | from a94e2d408eaedbd85aae259621d46fafc10479a2 before fd0fbe84312fda2fc187428c92c50b7d03a9d24c from a94e2d408eaedbd85aae259621d46fafc10479a2 before 71146c437bae59e5280f657965dc6d006ee3989b from a94e2d408eaedbd85aae259621d46fafc10479a2 before 0fce73efee40c65ce26641c5d93942462f9e8307 from a94e2d408eaedbd85aae259621d46fafc10479a2 before 16e94ed90b1b02398e044d41fd1db34828daa08e from a94e2d408eaedbd85aae259621d46fafc10479a2 before a0f09ff4c6b93312e565cfe75d76c3a551a3ec4c from a94e2d408eaedbd85aae259621d46fafc10479a2 before b0eca0edddf4c1dbaf6d1f6a8636b4235f5bc573 |
References
- NVD record
- CVE.org record
- GitHub advisory
- https://git.kernel.org/stable/c/fd0fbe84312fda2fc187428c92c50b7d03a9d24c
- https://git.kernel.org/stable/c/71146c437bae59e5280f657965dc6d006ee3989b
- https://git.kernel.org/stable/c/0fce73efee40c65ce26641c5d93942462f9e8307
- https://git.kernel.org/stable/c/16e94ed90b1b02398e044d41fd1db34828daa08e
- https://git.kernel.org/stable/c/a0f09ff4c6b93312e565cfe75d76c3a551a3ec4c
- https://git.kernel.org/stable/c/b0eca0edddf4c1dbaf6d1f6a8636b4235f5bc573
- https://github.com/advisories/GHSA-2cpv-4f6v-pr9h
- https://nvd.nist.gov/vuln/detail/CVE-2026-99218
- https://git.kernel.org/stable/c/61d58591aa0188bf2463e263962256316ff8b576