CVE-2025-38352 (GCVE-0-2025-38352)
Vulnerability from cvelistv5 – Published: 2025-07-22 08:04 – Updated: 2026-05-11 21:26Title
posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()
Summary
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.
Severity
7.4 (High)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
12 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < 78a4b8e3795b31dae58762bc091bb0f4f74a2200
(git)
Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < c076635b3a42771ace7d276de8dc3bc76ee2ba1b (git) Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < 2f3daa04a9328220de46f0d5c919a6c0073a9f0b (git) Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < 764a7a5dfda23f69919441f2eac2a83e7db6e5bb (git) Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < 2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff (git) Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < c29d5318708e67ac13c1b6fc1007d179fb65b4d7 (git) Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < 460188bc042a3f40f72d34b9f7fc6ee66b0b757b (git) Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < f90fff1e152dedf52b932240ebbd670d83330eca (git) |
|
| Linux | Linux |
Affected:
2.6.36
Unaffected: 0 , < 2.6.36 (semver) Unaffected: 5.4.295 , ≤ 5.4.* (semver) Unaffected: 5.10.239 , ≤ 5.10.* (semver) Unaffected: 5.15.186 , ≤ 5.15.* (semver) Unaffected: 6.1.142 , ≤ 6.1.* (semver) Unaffected: 6.6.94 , ≤ 6.6.* (semver) Unaffected: 6.12.34 , ≤ 6.12.* (semver) Unaffected: 6.15.3 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix) |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 91ff16fc-465c-4636-b3b7-fed36da126ea
Exploited: Yes
Timestamps
First Seen: 2025-09-04
Asserted: 2025-09-04
Scope
Notes: KEV entry: Linux Kernel Time-of-Check Time-of-Use (TOCTOU) Race Condition Vulnerability | Affected: Linux / Kernel | Description: Linux kernel contains a time-of-check time-of-use (TOCTOU) race condition vulnerability that has a high impact on confidentiality, integrity, and availability. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2025-09-25 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff ; https://source.android.com/docs/security/bulletin/2025-09-01 ; https://nvd.nist.gov/vuln/detail/CVE-2025-38352
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-367 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Kernel |
| Due Date | 2025-09-25 |
| Date Added | 2025-09-04 |
| Vendorproject | Linux |
| Vulnerabilityname | Linux Kernel Time-of-Check Time-of-Use (TOCTOU) Race Condition Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-02 13:24 UTC
| Updated: 2026-02-06 07:53 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 46c6a5e1-9e3e-44e4-a952-bd3430db5606
Exploited: Yes
Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() | Affected: Linux / Linux | CVSS: 7.4 (HIGH) | EPSS: 0.0187 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() |
| Vendor | Linux |
| Product | Linux |
| Added Date | 2026-06-01T10:40:05.482Z |
| Cvss Score | 7.4 |
| Epss Score | 0.0187 |
| Cvss Severity | HIGH |
| Epss Percentile | 0.7663 |
| Used In Malware | unknown |
| Ahead Of Cisa Kev |
|
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-19 12:42 UTC
| Updated: 2026-06-19 12:42 UTC
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But the check still\\nmakes sense, task_work_add(\u0026tsk-\u003eposix_cputimers_work.work) will fail\\nanyway in this case.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: posix-cpu-timers: corregir la ejecuci\u00f3n entre handle_posix_cpu_timers() y posix_cpu_timer_del(). Si una tarea no autorecuperadora que est\u00e1 saliendo ya ha pasado exit_notify() y llama a handle_posix_cpu_timers() desde IRQ, puede ser recuperada por su padre o depurador justo despu\u00e9s de unlock_task_sighand(). Si en ese momento se ejecuta un posix_cpu_timer_del() concurrente, no podr\u00e1 detectar timer-\u0026gt;it.cpu.firing != 0: cpu_timer_task_rcu() y/o lock_task_sighand() fallar\u00e1n. Agregue la verificaci\u00f3n tsk-\u0026gt;exit_state en run_posix_cpu_timers() para corregir esto. Esta correcci\u00f3n no es necesaria si CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, porque exit_task_work() se llama antes de exit_notify(). Pero la verificaci\u00f3n sigue teniendo sentido, task_work_add(\u0026amp;tsk-\u0026gt;posix_cputimers_work.work) fallar\u00e1 de todos modos en este 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\"active\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-09-05T03:55:31.566379Z\"}}}, {\"other\": {\"type\": \"kev\", \"content\": {\"dateAdded\": \"2025-09-04\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-38352\"}}}], \"references\": [{\"url\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-38352\", \"tags\": [\"government-resource\"]}, {\"url\": \"https://github.com/farazsth98/chronomaly\", \"tags\": [\"exploit\"]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-367\", \"description\": \"CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-09-02T18:20:34.530Z\"}}], \"cna\": {\"title\": \"posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"0bdd2ed4138ec04e09b4f8165981efc99e439f55\", \"lessThan\": \"78a4b8e3795b31dae58762bc091bb0f4f74a2200\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0bdd2ed4138ec04e09b4f8165981efc99e439f55\", \"lessThan\": \"c076635b3a42771ace7d276de8dc3bc76ee2ba1b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0bdd2ed4138ec04e09b4f8165981efc99e439f55\", \"lessThan\": \"2f3daa04a9328220de46f0d5c919a6c0073a9f0b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0bdd2ed4138ec04e09b4f8165981efc99e439f55\", \"lessThan\": \"764a7a5dfda23f69919441f2eac2a83e7db6e5bb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0bdd2ed4138ec04e09b4f8165981efc99e439f55\", \"lessThan\": 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\"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/78a4b8e3795b31dae58762bc091bb0f4f74a2200\"}, {\"url\": \"https://git.kernel.org/stable/c/c076635b3a42771ace7d276de8dc3bc76ee2ba1b\"}, {\"url\": \"https://git.kernel.org/stable/c/2f3daa04a9328220de46f0d5c919a6c0073a9f0b\"}, {\"url\": \"https://git.kernel.org/stable/c/764a7a5dfda23f69919441f2eac2a83e7db6e5bb\"}, {\"url\": \"https://git.kernel.org/stable/c/2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff\"}, {\"url\": \"https://git.kernel.org/stable/c/c29d5318708e67ac13c1b6fc1007d179fb65b4d7\"}, {\"url\": \"https://git.kernel.org/stable/c/460188bc042a3f40f72d34b9f7fc6ee66b0b757b\"}, {\"url\": \"https://git.kernel.org/stable/c/f90fff1e152dedf52b932240ebbd670d83330eca\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nposix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()\\n\\nIf an exiting non-autoreaping task has already passed exit_notify() and\\ncalls handle_posix_cpu_timers() from IRQ, it can be reaped by its parent\\nor debugger right after unlock_task_sighand().\\n\\nIf a concurrent posix_cpu_timer_del() runs at that moment, it won\u0027t be\\nable to detect timer-\u003eit.cpu.firing != 0: cpu_timer_task_rcu() and/or\\nlock_task_sighand() will fail.\\n\\nAdd the tsk-\u003eexit_state check into run_posix_cpu_timers() to fix this.\\n\\nThis fix is not needed if CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, because\\nexit_task_work() is called before exit_notify(). But the check still\\nmakes sense, task_work_add(\u0026tsk-\u003eposix_cputimers_work.work) will fail\\nanyway in this case.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.295\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.239\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.186\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.142\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.94\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.34\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.15.3\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.16\", \"versionStartIncluding\": \"2.6.36\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-07-28T04:19:41.105Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2025-38352\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-26T17:50:25.787Z\", \"dateReserved\": \"2025-04-16T04:51:24.006Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-07-22T08:04:25.277Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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