{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "07d91ef510fb16a2e0ca7453222105835b7ba3b8"
            },
            {
              "fixed": "220ee9e04ca3b7f014c000264aa6c884f036c86e"
            },
            {
              "fixed": "81aadbd09bf1dcd3238212f336ba699503557ae8"
            },
            {
              "fixed": "244f301759fd34b1dd0b4192ce44f8ef224e027d"
            },
            {
              "fixed": "7d1559126d86be6e4f6a85663dfbfe85caa47e37"
            },
            {
              "fixed": "e4a4ccfa470f910b747b3ee8d18670ed8ac8a236"
            },
            {
              "fixed": "a3b8d46fe401cba3a5c46dea610e6eb3dc15370e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.15.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90003.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Prevent rcuwait use-after-free during requeue PI\n\nOn PREEMPT_RT, FUTEX_CMP_REQUEUE_PI can trigger a KASAN report\n(slab-out-of-bounds) in futex_requeue_pi_complete() invocation of\nrcuwait_wake_up().\n\nThe futex_q used by futex_wait_requeue_pi() is allocated on the waiter's\nstack. An early wakeup can race with a PI requeue as follows:\n\n        waiter                          requeue task\n        ------                          ------------\nfutex_wait_requeue_pi()\n  futex_do_wait()\n    schedule()\n                                       futex_requeue\n                                         futex_proxy_trylock_atomic()\n                                           futex_requeue_pi_prepare()\n                                            Q_REQUEUE_PI_NONE -\u003e Q_REQUEUE_PI_IN_PROGRESS\n* timeout/ signal wakes waiter *\n  futex_requeue_pi_wakeup_sync()\n   Q_REQUEUE_PI_IN_PROGRESS -\u003e Q_REQUEUE_PI_WAIT\n                                           requeue_pi_wake_futex\n                                             futex_requeue_pi_complete()\n                                               cmpxchg Q_REQUEUE_PI_WAIT -\u003e Q_REQUEUE_PI_LOCKED\n    rcuwait_wait_event()\n      if (atomic_read(\u0026q-\u003erequeue_state) != Q_REQUEUE_PI_WAIT)\n       break /* no schedule() */\n\n /* q.pi_state-\u003eowner == current */\n futex_private_hash_put()\n /* return from syscall */\n                                              rcuwait_wake_up(\u0026q-\u003erequeue_wait)\n                                                /* q is gone */\n\nfutex_requeue_pi_complete() publishes Q_REQUEUE_PI_LOCKED before\ncalling rcuwait_wake_up(). The waiter observes this state in\nrcuwait_wait_event() before invoking schedule() in rcuwait_wait_event().\nHere, the waiter is free leave the syscall before requeue task can\ncomplete the wake.\n\nTo address this race skip rcuwait_wake_up() in the Q_REQUEUE_PI_LOCKED\ncase.\nThis state is only published by requeue_pi_wake_futex(), which saves\nq-\u003etask before futex_requeue_pi_complete() and wakes the waiter via\nwake_up_state().\n\nThis wake is intended to wake the waiter from its futex_do_wait() sleep.\nIf the waiter is still sleeping there, it can not get into the\nQ_REQUEUE_PI_WAIT state (and require this removed wake).\nShould the waiter be woken up from futex_do_wait() by other means (as in\nthis example) and sleep in futex_requeue_pi_wakeup_sync() then the\nwake_up_state() from requeue_pi_wake_futex() will wake it, too.\nShould the waiter task terminate before wake_up_state() had a chance to\nwake the task then the task pointer does not become invalid because the\nfutex_hash_bucket::lock is held and the task pointer is RCU protected.\n\n[bigeasy: Updated comment and commit message]",
  "id": "CVE-2026-90003",
  "modified": "2026-09-18T03:30:55.673913345Z",
  "published": "2026-09-16T10:33:13.420Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/220ee9e04ca3b7f014c000264aa6c884f036c86e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/244f301759fd34b1dd0b4192ce44f8ef224e027d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d1559126d86be6e4f6a85663dfbfe85caa47e37"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/81aadbd09bf1dcd3238212f336ba699503557ae8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3b8d46fe401cba3a5c46dea610e6eb3dc15370e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e4a4ccfa470f910b747b3ee8d18670ed8ac8a236"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90003.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90003"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "futex: Prevent rcuwait use-after-free during requeue PI"
}