sched/psi: Shut down rtpoll_timer in psi_cgroup_free()
In the Linux kernel, the following vulnerability has been resolved: sched/psi: Shut down rtpoll_timer in psi_cgroup_free() psi_schedule_rtpoll_work() is called locklessly from the scheduler hotpath and can race psi_trigger_destroy() taking down the last rtpoll trigger under rtpoll_trigger_lock: psi_schedule_rtpoll_work() psi_trigger_destroy() rcu_read_lock(); task = rcu_dereference(rtpoll_task); rcu_assign_pointer(rtpoll_task, NULL); timer_delete(&rtpoll_timer); mod_timer(&rtpoll_timer, ...); rcu_read_unlock(); synchronize_rcu(); kthread_stop(task_to_destroy); The group can then be freed with the re-armed timer still pending, and poll_timer_fn() runs on freed memory. 461daba06bdc ("psi: eliminate kthread_worker from psi trigger scheduling mechanism") deleted the timer synchronously after the synchronize_rcu(), which prevented this but raced trigger creation instead: the deletion could cancel the timer that a new trigger set armed during the grace period and, as creation also reinitialized the timer at the time, corrupt it. 8f91efd870ea ("psi: Fix race between psi_trigger_create/destroy") moved the initialization into group_init() and the deletion into the locked section, trading the creation races for the window above. Neither placement in the destruction path works. A pending timer firing while the group is alive is harmless though. poll_timer_fn() just wakes the rtpoll waitqueue and doesn't re-arm itself. Bind the timer to the group's lifetime instead and shut it down in ps
CVE-2026-74594
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-2026-74594
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": "6bfcb6178925b1fd28c102e53d403091b8f49396",
"lessThan": "4addb102154b7cf6e2310ccbe20c3c08619e520d",
"versionType": "git"
},
{
"status": "affected",
"version": "8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83",
"lessThan": "894a9300d7fb2e2951da92e565ae6de7ddfb0a69",
"versionType": "git"
},
{
"status": "affected",
"version": "8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83",
"lessThan": "1e5ca82eee59caca6988f9d6e859786aab8a5fa0",
"versionType": "git"
},
{
"status": "affected",
"version": "8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83",
"lessThan": "310b5a537a78c358a4cd244bd767c1a517a05459",
"versionType": "git"
},
{
"status": "affected",
"version": "8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83",
"lessThan": "806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08",
"versionType": "git"
},
{
"status": "affected",
"version": "8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83",
"lessThan": "8037c5b2b2a447df52542f4d8535895d837bdcbd",
"versionType": "git"
},
{
"status": "affected",
"version": "8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83",
"lessThan": "611e7821c4f83a671455658797336faecc3a5196",
"versionType": "git"
},
{
"status": "affected",
"version": "8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83",
"lessThan": "5457025fa8ca3c0d2732109513de839e3e797190",
"versionType": "git"
},
{
"status": "affected",
"version": "e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49",
"versionType": "git"
},
{
"status": "affected",
"version": "979965c33f734a1666af67900408f997ac669c23",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.50",
"lessThan": "5.10.266",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.12.17",
"lessThan": "5.13",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.13.2",
"lessThan": "5.14",
"versionType": "semver"
}
],
"programFiles": [
"kernel/sched/psi.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.266",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.217",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/sched/psi.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74594
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33229 · Revision 1
- Added to Heist Feed
- Publisher date