--- id: CVE-2025-38352 title: >- 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 ha… 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 ha… severity: high cvss: 7.8 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H' cwe: - CWE-367 - CWE-362 vendor: linux product: linux_kernel affected: - 'linux_kernel >= 2.6.36, < 5.4.295' - 'linux_kernel >= 5.5, < 5.10.239' - 'linux_kernel >= 5.11, < 5.15.186' - 'linux_kernel >= 5.16, < 6.1.142' - 'linux_kernel >= 6.2, < 6.6.94' - 'linux_kernel >= 6.7, < 6.12.34' - 'linux_kernel >= 6.13, < 6.15.3' - linux_kernel = 6.16 - debian_linux = 11.0 patched: - linux_kernel 6.15.3 published: '2025-07-22' updated: '2026-09-08' sourceUpdated: '2026-09-08T18:17:32.447' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-38352' references: - url: 'https://git.kernel.org/stable/c/2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/2f3daa04a9328220de46f0d5c919a6c0073a9f0b' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/460188bc042a3f40f72d34b9f7fc6ee66b0b757b' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/764a7a5dfda23f69919441f2eac2a83e7db6e5bb' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/78a4b8e3795b31dae58762bc091bb0f4f74a2200' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/c076635b3a42771ace7d276de8dc3bc76ee2ba1b' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/c29d5318708e67ac13c1b6fc1007d179fb65b4d7' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/f90fff1e152dedf52b932240ebbd670d83330eca' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://github.com/farazsth98/chronomaly' label: 134c704f-9b21-4f2e-91b3-4a467353bcc0 - url: >- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-38352 label: 134c704f-9b21-4f2e-91b3-4a467353bcc0 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38352.json - url: 'https://access.redhat.com/security/cve/CVE-2025-38352' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2382581' - url: 'https://www.cve.org/CVERecord?id=CVE-2025-38352' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-38352' - url: >- https://lore.kernel.org/linux-cve-announce/2025072229-CVE-2025-38352-f1de@gregkh/T - url: 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog' - url: 'https://access.redhat.com/errata/RHSA-2025:15648' - url: 'https://access.redhat.com/errata/RHSA-2025:15646' - url: 'https://access.redhat.com/errata/RHSA-2025:15662' - url: 'https://access.redhat.com/errata/RHSA-2025:15670' - url: 'https://access.redhat.com/errata/RHSA-2025:15669' - url: 'https://access.redhat.com/errata/RHSA-2025:15668' - url: 'https://access.redhat.com/errata/RHSA-2025:15661' - url: 'https://access.redhat.com/errata/RHSA-2025:15471' - url: 'https://access.redhat.com/errata/RHSA-2025:15921' - url: 'https://access.redhat.com/errata/RHSA-2025:15656' - url: 'https://access.redhat.com/errata/RHSA-2025:15660' - url: 'https://access.redhat.com/errata/RHSA-2025:15647' - url: 'https://access.redhat.com/errata/RHSA-2025:16045' - url: 'https://access.redhat.com/errata/RHSA-2025:15649' - url: 'https://access.redhat.com/errata/RHSA-2025:16008' - url: 'https://access.redhat.com/errata/RHSA-2025:15933' - url: 'https://access.redhat.com/errata/RHSA-2025:15931' - url: 'https://access.redhat.com/errata/RHSA-2025:15932' - url: 'https://access.redhat.com/errata/RHSA-2025:15798' - url: 'https://access.redhat.com/errata/RHSA-2025:15472' - url: 'https://access.redhat.com/errata/RHSA-2025:15658' - url: 'https://access.redhat.com/errata/RHSA-2025:15657' tags: - nvd - kev - in-the-wild - exploit-available - cve.org - csaf - vex - red-hat epss: 0.01297 epssPercentile: 0.69142 kev: true kevDateAdded: '2025-09-04' kevDueDate: '2025-09-25' kevRansomware: false exploited: true exploits: github: 6 githubRepos: - 'https://github.com/farazsth98/poc-CVE-2025-38352' - 'https://github.com/farazsth98/chronomaly' - 'https://github.com/Crime2/poc-CVE-2025-38352' checkedAt: '2026-09-24T07:52:53.330Z' exploitAvailable: true ssvc: exploitation: active automatable: 'no' technicalImpact: total timestamp: '2025-09-05T03:55:31.566379Z' ingestedAt: '2026-07-31T06:58:50.977Z' scores: nvd: 7.8 vendor: 7 --- ## Overview 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. ## Affected - `linux_kernel >= 2.6.36, < 5.4.295` - `linux_kernel >= 5.5, < 5.10.239` - `linux_kernel >= 5.11, < 5.15.186` - `linux_kernel >= 5.16, < 6.1.142` - `linux_kernel >= 6.2, < 6.6.94` - `linux_kernel >= 6.7, < 6.12.34` - `linux_kernel >= 6.13, < 6.15.3` - `linux_kernel = 6.16` - `debian_linux = 11.0` ## Remediation Upgrade past the affected range: - `linux_kernel 6.15.3` ## Vendor advisories - **RHSA-2025:15648** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · released 2025-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2025:15648) - **RHSA-2025:15646** · Red Hat · fixed in: Red Hat Enterprise Linux for Real Time (v. 7 ELS) · released 2025-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2025:15646) - **RHSA-2025:15662** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2025-09-11 · [advisory](https://access.redhat.com/errata/RHSA-2025:15662) - **RHSA-2025:15670** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.0), Red Hat Enterprise Linux BaseOS E4S (v.9.0) · released 2025-09-11 · [advisory](https://access.redhat.com/errata/RHSA-2025:15670) - **RHSA-2025:15669** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2) · released 2025-09-11 · [advisory](https://access.redhat.com/errata/RHSA-2025:15669) - **RHSA-2025:15668** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.4), Red Hat Enterprise Linux BaseOS EUS (v.9.4), Red Hat CodeReady Linux Builder EUS (v.9.4), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4), Red Hat Enterprise Linux Real Time EUS (v.9.4) · released 2025-09-11 · [advisory](https://access.redhat.com/errata/RHSA-2025:15668) - **RHSA-2025:15661** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2025-09-11 · [advisory](https://access.redhat.com/errata/RHSA-2025:15661) - **RHSA-2025:15471** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2025-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2025:15471) - **RHSA-2025:15921** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8) · released 2025-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2025:15921) - **RHSA-2025:15656** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS AUS (v. 8.2) · released 2025-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2025:15656) - **RHSA-2025:15660** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) · released 2025-09-11 · [advisory](https://access.redhat.com/errata/RHSA-2025:15660)