CVE-2025-38352 (GCVE-0-2025-38352)

Vulnerability from cvelistv5 – Published: 2025-07-22 08:04 – Updated: 2026-08-05 12:01
VLAI CISA KEVIntel
Title
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
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.4 (High)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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
Impacted 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)
Create a notification for this product.
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)
Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8919cea1-7f34-4580-93a8-d0435055dd0e

Vulnerability ID: CVE-2025-38352

Status: Confirmed

Status Updated: 2025-09-04 00:00 UTC

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 12:25 UTC | Updated: 2026-02-06 07:17 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4dfbc5d1-59f9-4ec9-b99b-61760e086d6c

Vulnerability ID: CVE-2025-38352

Status: Confirmed

Status Updated: 2026-06-01 10:40 UTC

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: 0.01345 | 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 0.01345
Cvss Severity HIGH
Epss Percentile 0.67735
Used In Malware unknown
Ahead Of Cisa Kev 
{
  "count": 1,
  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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      "title": "posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38352\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-22T08:15:23.577\",\"lastModified\":\"2026-07-30T13:13:18.130\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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.\"},{\"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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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-30T08:52:03+00:00",
      "cve": "CVE-2025-38352",
      "id": "CVE-2025-38352",
      "initial_release_date": "2025-07-22T00:00:00+00:00",
      "product_status:fixed": "1985",
      "product_status:known_not_affected": "32",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38352.json",
      "version": "3"
    },
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      "aggregate_severity": "important",
      "current_release_date": "2026-07-25T00:47:41Z",
      "cve": "CVE-2025-38352",
      "id": "CVE-2025-38352",
      "initial_release_date": "2025-07-23T23:23:20Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "405",
      "product_status:known_not_affected": "292",
      "product_status:recommended": "987",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38352",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38352.json",
      "version": "58"
    },
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\"lessThan\": \"764a7a5dfda23f69919441f2eac2a83e7db6e5bb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0bdd2ed4138ec04e09b4f8165981efc99e439f55\", \"lessThan\": \"2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0bdd2ed4138ec04e09b4f8165981efc99e439f55\", \"lessThan\": \"c29d5318708e67ac13c1b6fc1007d179fb65b4d7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0bdd2ed4138ec04e09b4f8165981efc99e439f55\", \"lessThan\": \"460188bc042a3f40f72d34b9f7fc6ee66b0b757b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0bdd2ed4138ec04e09b4f8165981efc99e439f55\", \"lessThan\": \"f90fff1e152dedf52b932240ebbd670d83330eca\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/time/posix-cpu-timers.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", 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{\"status\": \"unaffected\", \"version\": \"6.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/time/posix-cpu-timers.c\"], \"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\": \"2026-07-30T05:53:07.549Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-38352\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-30T05:53:07.549Z\", \"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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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.


Detection rules are retrieved from Rulezet.