CVE-2026-43499

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Source
https://cve.org/CVERecord?id=CVE-2026-43499
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43499.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-43499
Downstream
Related
Published
2026-05-21T12:17:49Z
Modified
2026-08-28T11:30:42Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
rtmutex: Use waiter::task instead of current in remove_waiter()
Details

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 ]

Database specific 
{
    "cna_assigner":  "Linux",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43499.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
8161239a8bcce9ad6b537c04a1fa3b5c68bae693
Fixed
f3fa3424bceb128d2be4b3745506b22844b87db7
Fixed
838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd
Fixed
d8cce4773c2b23d819baf5abedc62f7b430e8745
Fixed
8a1fc8d698ac5e5916e3082a0f74450d71f9611f
Fixed
6d52dfcb2a5db86e346cf51f8fcf2071b8085166
Fixed
3fb7394a837740770f0d6b4b30567e60786a63f2
Fixed
88614876370aac8ad1050ad785a4c095ba17ac11
Fixed
3bfdc63936dd4773109b7b8c280c0f3b5ae7d349

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43499.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.6.39
Fixed
5.10.261
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.212
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.175
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.140
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.86
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.27
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.0.4

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43499.json"