cgroup: split cgroup_destroy_wq into 3 workqueues
In the Linux kernel, the following vulnerability has been resolved: cgroup: split cgroup_destroy_wq into 3 workqueues A hung task can occur during [1] LTP cgroup testing when repeatedly mounting/unmounting perf_event and net_prio controllers with systemd.unified_cgroup_hierarchy=1. The hang manifests in cgroup_lock_and_drain_offline() during root destruction. Related case: cgroup_fj_function_perf_event cgroup_fj_function.sh perf_event cgroup_fj_function_net_prio cgroup_fj_function.sh net_prio Call Trace: cgroup_lock_and_drain_offline+0x14c/0x1e8 cgroup_destroy_root+0x3c/0x2c0 css_free_rwork_fn+0x248/0x338 process_one_work+0x16c/0x3b8 worker_thread+0x22c/0x3b0 kthread+0xec/0x100 ret_from_fork+0x10/0x20 Root Cause: CPU0 CPU1 mount perf_event umount net_prio cgroup1_get_tree cgroup_kill_sb rebind_subsystems // root destruction enqueues // cgroup_destroy_wq // kill all perf_event css // one perf_event css A is dying // css A offline enqueues cgroup_destroy_wq // root destruction will be executed first css_free_rwork_fn cgroup_destroy_root cgroup_lock_and_drain_offline // some perf descendants are dying // cgroup_destroy_wq max_active = 1 // waiting for css A to die Problem scenario: 1. CPU0 mounts perf_event (rebind_subsystems) 2. CPU1 unmounts net_prio (cgroup_kill_sb), queuing root destruction work 3. A dying perf_event CSS gets queued for offline after root destruction 4. Root destruction waits for offline completion, but offline work is blocked behind root destruction in cgro
CVE-2025-39953
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-2025-39953
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": "334c3679ec4b2b113c35ebe37d2018b112dd5013",
"lessThan": "cabadd7fd15f97090f752fd22dd7f876a0dc3dc4",
"versionType": "git"
},
{
"status": "affected",
"version": "334c3679ec4b2b113c35ebe37d2018b112dd5013",
"lessThan": "a0c896bda7077aa5005473e2c5b3c27173313b4c",
"versionType": "git"
},
{
"status": "affected",
"version": "334c3679ec4b2b113c35ebe37d2018b112dd5013",
"lessThan": "f2795d1b92506e3adf52a298f7181032a1525e04",
"versionType": "git"
},
{
"status": "affected",
"version": "334c3679ec4b2b113c35ebe37d2018b112dd5013",
"lessThan": "993049c9b1355c78918344a6403427d53f9ee700",
"versionType": "git"
},
{
"status": "affected",
"version": "334c3679ec4b2b113c35ebe37d2018b112dd5013",
"lessThan": "4a1e3ec28e8062cd9f339aa6a942df9c5bcb6811",
"versionType": "git"
},
{
"status": "affected",
"version": "334c3679ec4b2b113c35ebe37d2018b112dd5013",
"lessThan": "ded4d207a3209a834b6831ceec7f39b934c74802",
"versionType": "git"
},
{
"status": "affected",
"version": "334c3679ec4b2b113c35ebe37d2018b112dd5013",
"lessThan": "05e0b03447cf215ec384210441b34b7a3b16e8b0",
"versionType": "git"
},
{
"status": "affected",
"version": "334c3679ec4b2b113c35ebe37d2018b112dd5013",
"lessThan": "79f919a89c9d06816dbdbbd168fa41d27411a7f9",
"versionType": "git"
}
],
"programFiles": [
"kernel/cgroup/cgroup.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.300",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.245",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.194",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.154",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.108",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.49",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.16.9",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/cgroup/cgroup.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-39953
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #27075 · Revision 1
- Added to Heist Feed
- Publisher date