{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74594",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74594"
  ],
  "published": "2026-08-22T15:32:12Z",
  "summary": "sched/psi: Shut down rtpoll_timer in psi_cgroup_free()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/psi: Shut down rtpoll_timer in psi_cgroup_free()\n\npsi_schedule_rtpoll_work() is called locklessly from the scheduler hotpath\nand can race psi_trigger_destroy() taking down the last rtpoll trigger under\nrtpoll_trigger_lock:\n\n  psi_schedule_rtpoll_work()        psi_trigger_destroy()\n\n  rcu_read_lock();\n  task = rcu_dereference(rtpoll_task);\n                                    rcu_assign_pointer(rtpoll_task, NULL);\n                                    timer_delete(&rtpoll_timer);\n  mod_timer(&rtpoll_timer, ...);\n  rcu_read_unlock();\n                                    synchronize_rcu();\n                                    kthread_stop(task_to_destroy);\n\nThe group can then be freed with the re-armed timer still pending, and\npoll_timer_fn() runs on freed memory.\n\n461daba06bdc (\"psi: eliminate kthread_worker from psi trigger scheduling\nmechanism\") deleted the timer synchronously after the synchronize_rcu(),\nwhich prevented this but raced trigger creation instead: the deletion could\ncancel the timer that a new trigger set armed during the grace period and,\nas creation also reinitialized the timer at the time, corrupt it.\n8f91efd870ea (\"psi: Fix race between psi_trigger_create/destroy\") moved the\ninitialization into group_init() and the deletion into the locked section,\ntrading the creation races for the window above.\n\nNeither placement in the destruction path works. A pending timer firing\nwhile the group is alive is harmless though. poll_timer_fn() just wakes the\nrtpoll waitqueue and doesn't re-arm itself. Bind the timer to the group's\nlifetime instead and shut it down in psi_cgroup_free(). Nothing can arm it\nby then. timer_shutdown_sync() because the timer is never armed again.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74594"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4addb102154b7cf6e2310ccbe20c3c08619e520d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/894a9300d7fb2e2951da92e565ae6de7ddfb0a69"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1e5ca82eee59caca6988f9d6e859786aab8a5fa0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/310b5a537a78c358a4cd244bd767c1a517a05459"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8037c5b2b2a447df52542f4d8535895d837bdcbd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/611e7821c4f83a671455658797336faecc3a5196"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5457025fa8ca3c0d2732109513de839e3e797190"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-25T05:42:41Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Reachable only via local kernel interfaces: writing cgroup *.pressure or /proc/pressure/*, closing the trigger fd, and removing the cgroup; the race involves scheduler hotpath callbacks, not any network protocol.\nAC:L - The attacker controls both race participants\u2014closing/destroying the last privileged PSI trigger while concurrently driving psi_schedule_rtpoll_work() via cgroup task scheduling or the psimon worker\u2014so the mod_timer-after-timer_delete window is reliably winnable.\nPR:L - The vulnerable rtpoll path requires CAP_SYS_RESOURCE (non-2s PSI windows); that capability is available to an unprivileged user who creates a user namespace, and cgroup pressure files are writable under delegated cgroup v2 hierarchies in that namespace.\nUI:N - Exploitation is fully self-driven: the attacker creates the trigger, races its teardown against scheduler activity, and deletes the cgroup; no separate victim action such as mounting a filesystem or opening a file is required.\nS:U - Impact is confined to kernel memory corruption and potential local privilege escalation within the same kernel security authority; it does not cross a VM, container runtime, or IOMMU trust boundary.\nC:H - After psi_cgroup_free() the pending rtpoll_timer fires poll_timer_fn() on a freed psi_group, a classic use-after-free that can expose or corrupt adjacent slab contents and be developed into arbitrary kernel memory read primitives.\nI:H - poll_timer_fn() performs atomic_set() on group->rtpoll_wakeup and wake_up_interruptible() on group->rtpoll_wait after the psi_group is freed, giving attacker-influenced writes into a recycled kmem object suitable for control-flow hijacking.\nA:H - Timer execution on freed psi_group memory can cause immediate kernel oops/panic from invalid pointer dereferences or list corruption, and the race can be retriggered for sustained denial of service on shared cloud/container hosts."
    }
  }
}