{
  "cveId": "CVE-2026-90305",
  "url": "https://patchblox.com/security/cve/CVE-2026-90305",
  "summary": "CVE-2026-90305 is fixed in linux on 1 platform by DEBIAN-CVE-2026-90305 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ARM: 9483/1: select HAVE_POSIX_CPU_TIMERS_TASK_W...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ARM: 9483/1: select HAVE_POSIX_CPU_TIMERS_TASK_WORK  Commit c6e61c06d606 (\u0022ARM: 9463/1: Allow to enable RT\u0022) enabled PREEMPT_RT on ARM but did not select HAVE_POSIX_CPU_TIMERS_TASK_WORK. This leaves CONFIG_POSIX_CPU_TIMERS_TASK_WORK disabled, so CPU timers expire in hard IRQ context.  On PREEMPT_RT this makes run_posix_cpu_timers() take the sleeping sighand-\u003Esiglock:    BUG: sleeping function called from invalid context at spinlock_rt.c:48     rt_spin_lock from lock_task_sighand     lock_task_sighand from run_posix_cpu_timers     run_posix_cpu_timers from update_process_times  ARM handles TIF_NOTIFY_RESUME on all return-to-user paths, including v7-M. ARM32 KVM host support was removed by commit 541ad0150ca4 (\u0022arm: Remove 32bit KVM host support\u0022), so the select need not be conditional on KVM.  Select it to defer POSIX CPU timer expiry to task context.  Reproduced with setrlimit(RLIMIT_CPU, ...) and a busy loop. The same path is used by setitimer(ITIMER_PROF or ITIMER_VIRTUAL) and POSIX CPU timers created with timer_create().",
  "published": "2026-09-17T17:17:28Z",
  "severity": "",
  "epss": 0.00198,
  "epssPercentile": 0.09581,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-90305",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90305",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}