CVE-2025-38352
Confirmed PUBLISHEDposix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()
1 day faster than CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() If an exiting non-autoreaping task has already passed exit_notify() and calls handle_posix_cpu_timers() from IRQ, it can be reaped by its parent or debugger right after unlock_task_sighand(). If a concurrent posix_cpu_timer_del() runs at that moment, it won't be able to detect timer->it.cpu.firing != 0: cpu_timer_task_rcu() and/or lock_task_sighand() will fail. Add the tsk->exit_state check into run_posix_cpu_timers() to fix this. This fix is not needed if CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, because exit_task_work() is called before exit_notify(). But the check still makes sense, task_work_add(&tsk->posix_cputimers_work.work) will fail anyway in this case.
- CVE Published
- Jul 22, 2025
- Exploitation Reported
- Jun 01, 2026
- CVSS
- 7.4 High
- EPSS
- 1.3%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Linux |
Linux
|
0bdd2ed4138ec04e09b4f8165981efc99e439f55 to < 78a4b8e3795b31dae58762bc091bb0f4f74a2200 |
Affected |
| Linux |
Linux
|
0bdd2ed4138ec04e09b4f8165981efc99e439f55 to < c076635b3a42771ace7d276de8dc3bc76ee2ba1b |
Affected |
| Linux |
Linux
|
0bdd2ed4138ec04e09b4f8165981efc99e439f55 to < 2f3daa04a9328220de46f0d5c919a6c0073a9f0b |
Affected |
| Linux |
Linux
|
0bdd2ed4138ec04e09b4f8165981efc99e439f55 to < 764a7a5dfda23f69919441f2eac2a83e7db6e5bb |
Affected |
| Linux |
Linux
|
0bdd2ed4138ec04e09b4f8165981efc99e439f55 to < 2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff |
Affected |
| Linux |
Linux
|
0bdd2ed4138ec04e09b4f8165981efc99e439f55 to < c29d5318708e67ac13c1b6fc1007d179fb65b4d7 |
Affected |
| Linux |
Linux
|
0bdd2ed4138ec04e09b4f8165981efc99e439f55 to < 460188bc042a3f40f72d34b9f7fc6ee66b0b757b |
Affected |
| Linux |
Linux
|
0bdd2ed4138ec04e09b4f8165981efc99e439f55 to < f90fff1e152dedf52b932240ebbd670d83330eca |
Affected |
| Linux |
Linux
|
2.6.36 |
Affected |
| Linux |
Linux
|
0 to < 2.6.36 |
Unaffected |
| Linux |
Linux
|
5.4.295 to <= 5.4.* |
Unaffected |
| Linux |
Linux
|
5.10.239 to <= 5.10.* |
Unaffected |
| Linux |
Linux
|
5.15.186 to <= 5.15.* |
Unaffected |
| Linux |
Linux
|
6.1.142 to <= 6.1.* |
Unaffected |
| Linux |
Linux
|
6.6.94 to <= 6.6.* |
Unaffected |
| Linux |
Linux
|
6.12.34 to <= 6.12.* |
Unaffected |
| Linux |
Linux
|
6.15.3 to <= 6.15.* |
Unaffected |
| Linux |
Linux
|
6.16 to <= * |
Unaffected |
CVE References
- git.kernel.org/stable/c/78a4b8e3795b31dae58762bc091bb0f4f74... git.kernel.org · CVE Record https://git.kernel.org/stable/c/78a4b8e3795b31dae58762bc091bb0f4f74a2200
- git.kernel.org/stable/c/c076635b3a42771ace7d276de8dc3bc76ee... git.kernel.org · CVE Record https://git.kernel.org/stable/c/c076635b3a42771ace7d276de8dc3bc76ee2ba1b
- git.kernel.org/stable/c/2f3daa04a9328220de46f0d5c919a6c0073... git.kernel.org · CVE Record https://git.kernel.org/stable/c/2f3daa04a9328220de46f0d5c919a6c0073a9f0b
- git.kernel.org/stable/c/764a7a5dfda23f69919441f2eac2a83e7db... git.kernel.org · CVE Record https://git.kernel.org/stable/c/764a7a5dfda23f69919441f2eac2a83e7db6e5bb
- git.kernel.org/stable/c/2c72fe18cc5f9f1750f5bc148cf1c94c29e... git.kernel.org · CVE Record https://git.kernel.org/stable/c/2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff
Show 3 more references
- git.kernel.org/stable/c/c29d5318708e67ac13c1b6fc1007d179fb6... git.kernel.org · CVE Record https://git.kernel.org/stable/c/c29d5318708e67ac13c1b6fc1007d179fb65b4d7
- git.kernel.org/stable/c/460188bc042a3f40f72d34b9f7fc6ee66b0... git.kernel.org · CVE Record https://git.kernel.org/stable/c/460188bc042a3f40f72d34b9f7fc6ee66b0b757b
- git.kernel.org/stable/c/f90fff1e152dedf52b932240ebbd670d833... git.kernel.org · CVE Record https://git.kernel.org/stable/c/f90fff1e152dedf52b932240ebbd670d83330eca
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CVE First | 2026-06-01 10:40 UTC |
| CISA | 2026-06-02 14:06 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2026-06-01 10:40:05 UTC · CVE
Weaknesses (CWE)
-
Time-of-check Time-of-use (TOCTOU) Race Condition
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
14:06 UTC about 2 months ago14:06 UTC · about 2 months ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
10:40 UTC about 2 months ago10:40 UTC · about 2 months ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
08:04 UTC 12 months ago08:04 UTC · 12 months ago
CVE published
Vulnerability disclosed publicly
-
04:51 UTC over 1 year ago04:51 UTC · over 1 year ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2025-38352
{
"cve_id": "CVE-2025-38352",
"title": "posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_ti...",
"affected_vendor": "Linux",
"affected_product": "Linux",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 7.4,
"epss_score": 0.01345,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}