rtmutex: Use waiter::task instead of current in remove_waiter()
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 ]
CVE-2026-43499
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-43499
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "8161239a8bcce9ad6b537c04a1fa3b5c68bae693",
"lessThan": "f3fa3424bceb128d2be4b3745506b22844b87db7",
"versionType": "git"
},
{
"status": "affected",
"version": "8161239a8bcce9ad6b537c04a1fa3b5c68bae693",
"lessThan": "838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd",
"versionType": "git"
},
{
"status": "affected",
"version": "8161239a8bcce9ad6b537c04a1fa3b5c68bae693",
"lessThan": "d8cce4773c2b23d819baf5abedc62f7b430e8745",
"versionType": "git"
},
{
"status": "affected",
"version": "8161239a8bcce9ad6b537c04a1fa3b5c68bae693",
"lessThan": "8a1fc8d698ac5e5916e3082a0f74450d71f9611f",
"versionType": "git"
},
{
"status": "affected",
"version": "8161239a8bcce9ad6b537c04a1fa3b5c68bae693",
"lessThan": "6d52dfcb2a5db86e346cf51f8fcf2071b8085166",
"versionType": "git"
},
{
"status": "affected",
"version": "8161239a8bcce9ad6b537c04a1fa3b5c68bae693",
"lessThan": "3fb7394a837740770f0d6b4b30567e60786a63f2",
"versionType": "git"
},
{
"status": "affected",
"version": "8161239a8bcce9ad6b537c04a1fa3b5c68bae693",
"lessThan": "88614876370aac8ad1050ad785a4c095ba17ac11",
"versionType": "git"
},
{
"status": "affected",
"version": "8161239a8bcce9ad6b537c04a1fa3b5c68bae693",
"lessThan": "3bfdc63936dd4773109b7b8c280c0f3b5ae7d349",
"versionType": "git"
}
],
"programFiles": [
"kernel/locking/rtmutex.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.39"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.39",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.140",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.86",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.27",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.4",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/locking/rtmutex.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43499
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #28354 · Revision 1
- Added to Heist Feed
- Publisher date