ARM: 9483/1: select HAVE_POSIX_CPU_TIMERS_TASK_WORK

{
  "id": "5a0aa8890cfb3a93f479a3a726e6488fe61cf97ff0dc023168f9aa64b17e2762",
  "url": "https://osv.dev/vulnerability/CVE-2026-90305",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ARM: 9483/1: select HAVE_POSIX_CPU_TIMERS_TASK_WORK",
    "summary": "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->siglock: 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().",
    "evidence": "osv:CVE-2026-90305",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-90305",
      "aliases": [
        "CVE-2026-90305"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c6e61c06d6061750597e79c598acb5dead44c35b"
                },
                {
                  "fixed": "8de56782d6e5ba7a9f8c820342dccde65502f93f"
                },
                {
                  "fixed": "8a58a41100ea377e978d99600ec24a9bd0273662"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90305.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.1.0"
                },
                {
                  "fixed": "7.2.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90305.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.148054645Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/8a58a41100ea377e978d99600ec24a9bd0273662",
        "https://git.kernel.org/stable/c/8de56782d6e5ba7a9f8c820342dccde65502f93f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90305.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90305",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90305.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90305",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 519953,
  "published_at": "2026-09-17T16:08:27.742+00:00"
}