CVE-2026-99218
coredump: hold RCU while releasing parked threads
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.0.
Affected products
- affected a94e2d408eaedbd85aae259621d46fafc10479a2 – < fd0fbe84312fda2fc187428c92c50b7d03a9d24c
- affected a94e2d408eaedbd85aae259621d46fafc10479a2 – < 71146c437bae59e5280f657965dc6d006ee3989b
- affected a94e2d408eaedbd85aae259621d46fafc10479a2 – < 0fce73efee40c65ce26641c5d93942462f9e8307
- affected a94e2d408eaedbd85aae259621d46fafc10479a2 – < 16e94ed90b1b02398e044d41fd1db34828daa08e
- affected a94e2d408eaedbd85aae259621d46fafc10479a2 – < a0f09ff4c6b93312e565cfe75d76c3a551a3ec4c
- affected a94e2d408eaedbd85aae259621d46fafc10479a2 – < b0eca0edddf4c1dbaf6d1f6a8636b4235f5bc573
- affected a94e2d408eaedbd85aae259621d46fafc10479a2 – < 61d58591aa0188bf2463e263962256316ff8b576
- affected 2.6.27
- unaffected < 2.6.27
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.161 – ≤ 6.6.*
- unaffected 6.12.115 – ≤ 6.12.*
- unaffected 6.18.60 – ≤ 6.18.*
- unaffected 7.2.14 – ≤ 7.2.*
- unaffected 7.3.1 – ≤ 7.3.*
- unaffected 7.4-rc1 – ≤ *
References (7)
- https://git.kernel.org/stable/c/fd0fbe84312fda2fc187428c92c50b7d03a9d24c (opens in a new tab)
- https://git.kernel.org/stable/c/71146c437bae59e5280f657965dc6d006ee3989b (opens in a new tab)
- https://git.kernel.org/stable/c/0fce73efee40c65ce26641c5d93942462f9e8307 (opens in a new tab)
- https://git.kernel.org/stable/c/16e94ed90b1b02398e044d41fd1db34828daa08e (opens in a new tab)
- https://git.kernel.org/stable/c/a0f09ff4c6b93312e565cfe75d76c3a551a3ec4c (opens in a new tab)
- https://git.kernel.org/stable/c/b0eca0edddf4c1dbaf6d1f6a8636b4235f5bc573 (opens in a new tab)
- https://git.kernel.org/stable/c/61d58591aa0188bf2463e263962256316ff8b576 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-99218)Record last updated .