- 7.8HighCVSS base score
- 5.4%Exploitation in 30 daysEPSS · top 7.2% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
Description
In the Linux kernel, the following vulnerability has been resolved: rtmutex: Use waiter::task instead of current in remove_waiter() remove_waiter() is used by the slowlock paths, but it is also used for proxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from futex_requeue(). In the latter case waiter::task is not current, but remove_waiter() operates on current for the dequeue operation. That results in several problems: 1) the rbtree dequeue happens without waiter::task::pi_lock being held 2) the waiter task's pi_blocked_on state is not cleared, which leaves a dangling pointer primed for UAF around. 3) rt_mutex_adjust_prio_chain() operates on the wrong top priority waiter task Use waiter::task instead of current in all related operations in remove_waiter() to cure those problems. [ tglx: Fixup rt_mutex_adjust_prio_chain(), add a comment and amend the changelog ]
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: a proof of concept is public.
Timeline
ID reserved
By Linux
- 20 days later
· 20 days later
Published
- 6 months later
· 6 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 5.4% · top 7.2% of all CVEs (11 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 – < f3fa3424bceb128d2be4b3745506b22844b87db7
- affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 – < 838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd
- affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 – < d8cce4773c2b23d819baf5abedc62f7b430e8745
- affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 – < 8a1fc8d698ac5e5916e3082a0f74450d71f9611f
- affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 – < 6d52dfcb2a5db86e346cf51f8fcf2071b8085166
- affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 – < 3fb7394a837740770f0d6b4b30567e60786a63f2
- affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 – < 88614876370aac8ad1050ad785a4c095ba17ac11
- affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 – < 3bfdc63936dd4773109b7b8c280c0f3b5ae7d349
- affected 2.6.39
- unaffected < 2.6.39
- unaffected 5.10.261 – ≤ 5.10.*
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.140 – ≤ 6.6.*
- unaffected 6.12.86 – ≤ 6.12.*
- unaffected 6.18.27 – ≤ 6.18.*
- unaffected 7.0.4 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References12
- https://git.kernel.org/stable/c/f3fa3424bceb128d2be4b3745506b22844b87db7 (opens in a new tab)
- https://git.kernel.org/stable/c/838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd (opens in a new tab)
- https://git.kernel.org/stable/c/d8cce4773c2b23d819baf5abedc62f7b430e8745 (opens in a new tab)
- https://git.kernel.org/stable/c/8a1fc8d698ac5e5916e3082a0f74450d71f9611f (opens in a new tab)
- https://git.kernel.org/stable/c/6d52dfcb2a5db86e346cf51f8fcf2071b8085166 (opens in a new tab)
- https://git.kernel.org/stable/c/3fb7394a837740770f0d6b4b30567e60786a63f2 (opens in a new tab)
- https://git.kernel.org/stable/c/88614876370aac8ad1050ad785a4c095ba17ac11 (opens in a new tab)
- https://git.kernel.org/stable/c/3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 (opens in a new tab)
- http://www.openwall.com/lists/oss-security/2026/07/08/12 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (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)
- EUVD EUVD-2026-31277 (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://cveledger.app/cve/CVE-2026-43499)Record last updated .