{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  ARM: 9483/1: select HAVE_POSIX_CPU_TIMERS_TASK_WORK  Commit c6e61c06d606 (\"ARM: 9463/1: Allow to enable RT\") 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 (\"arm: Remove 32bit KVM host support\"), 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().",
  "id": "DEBIAN-CVE-2026-90305",
  "modified": "2026-09-18T04:47:39.370059090Z",
  "published": "2026-09-17T17:17:28.163Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-90305"
    }
  ],
  "upstream": [
    "CVE-2026-90305"
  ]
}