CVE-2026-43499rtmutex: Use waiter::task instead of current in remove_waiter()
Updated under an hour ago ()
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It affects Linux and 5 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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 ]
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-416
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 before f3fa3424bceb128d2be4b3745506b22844b87db7; 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 builds before 838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd; from 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 before d8cce4773c2b23d819baf5abedc62f7b430e8745; 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 builds before 8a1fc8d698ac5e5916e3082a0f74450d71f9611f; 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 builds before 6d52dfcb2a5db86e346cf51f8fcf2071b8085166; 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 builds before 3fb7394a837740770f0d6b4b30567e60786a63f2; from 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 before 88614876370aac8ad1050ad785a4c095ba17ac11; 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 builds before 3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.39 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.86; from 6.13 before 6.18.27; from 6.19 before 7.0.4 | NVD |
References
- https://git.kernel.org/stable/c/f3fa3424bceb128d2be4b3745506b22844b87db7
- https://git.kernel.org/stable/c/838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd
- https://git.kernel.org/stable/c/d8cce4773c2b23d819baf5abedc62f7b430e8745patch
- https://git.kernel.org/stable/c/8a1fc8d698ac5e5916e3082a0f74450d71f9611fpatch
- https://git.kernel.org/stable/c/6d52dfcb2a5db86e346cf51f8fcf2071b8085166patch
- https://git.kernel.org/stable/c/3fb7394a837740770f0d6b4b30567e60786a63f2patch
- https://git.kernel.org/stable/c/88614876370aac8ad1050ad785a4c095ba17ac11patch
- https://git.kernel.org/stable/c/3bfdc63936dd4773109b7b8c280c0f3b5ae7d349patch
- http://www.openwall.com/lists/oss-security/2026/07/08/12
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.