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posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() (Linux Linux)

CVE-2025-38352
HIGH 7.8CISA KEV ↗Exploitée selon l'ENISA depuis le 2025-09-04

En bref

Source
NVD
EPSS
EPSS 1.36 % · centile 72 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Analyzed

Rechercher sur…

Description

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.

Faiblesses (CWE)

  • CWE-367 — Situation de compétition TOCTOU

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 0bdd2ed4138ec04e09b4f8165981efc99e439f55 < 78a4b8e3795b31dae58762bc091bb0f4f74a2200 ; affected 0bdd2ed4138ec04e09b4f8165981efc99e439f55 < c076635b3a42771ace7d276de8dc3bc76ee2ba1b ; affected 0bdd2ed4138ec04e09b4f8165981efc99e439f55 < 2f3daa04a9328220de46f0d5c919a6c0073a9f0b ; affected 0bdd2ed4138ec04e09b4f8165981efc99e439f55 < 764a7a5dfda23f69919441f2eac2a83e7db6e5bb ; affected 0bdd2ed4138ec04e09b4f8165981efc99e439f55 < 2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff ; affected 0bdd2ed4138ec04e09b4f8165981efc99e439f55 < c29d5318708e67ac13c1b6fc1007d179fb65b4d7
Linux · Linuxaffected 2.6.36 ; unaffected 0 < 2.6.36 ; unaffected 5.4.295 ≤ 5.4.* ; unaffected 5.10.239 ≤ 5.10.* ; unaffected 5.15.186 ≤ 5.15.* ; unaffected 6.1.142 ≤ 6.1.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
CISA Known Exploited VulnerabilitiesCC0 1.0
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD