CVE-2026-74594 (GCVE-0-2026-74594)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40
VLAI
Title
sched/psi: Shut down rtpoll_timer in psi_cgroup_free()
Summary
In the Linux kernel, the following vulnerability has been resolved: sched/psi: Shut down rtpoll_timer in psi_cgroup_free() psi_schedule_rtpoll_work() is called locklessly from the scheduler hotpath and can race psi_trigger_destroy() taking down the last rtpoll trigger under rtpoll_trigger_lock: psi_schedule_rtpoll_work() psi_trigger_destroy() rcu_read_lock(); task = rcu_dereference(rtpoll_task); rcu_assign_pointer(rtpoll_task, NULL); timer_delete(&rtpoll_timer); mod_timer(&rtpoll_timer, ...); rcu_read_unlock(); synchronize_rcu(); kthread_stop(task_to_destroy); The group can then be freed with the re-armed timer still pending, and poll_timer_fn() runs on freed memory. 461daba06bdc ("psi: eliminate kthread_worker from psi trigger scheduling mechanism") deleted the timer synchronously after the synchronize_rcu(), which prevented this but raced trigger creation instead: the deletion could cancel the timer that a new trigger set armed during the grace period and, as creation also reinitialized the timer at the time, corrupt it. 8f91efd870ea ("psi: Fix race between psi_trigger_create/destroy") moved the initialization into group_init() and the deletion into the locked section, trading the creation races for the window above. Neither placement in the destruction path works. A pending timer firing while the group is alive is harmless though. poll_timer_fn() just wakes the rtpoll waitqueue and doesn't re-arm itself. Bind the timer to the group's lifetime instead and shut it down in psi_cgroup_free(). Nothing can arm it by then. timer_shutdown_sync() because the timer is never armed again.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6bfcb6178925b1fd28c102e53d403091b8f49396 , < 4addb102154b7cf6e2310ccbe20c3c08619e520d (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 894a9300d7fb2e2951da92e565ae6de7ddfb0a69 (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 1e5ca82eee59caca6988f9d6e859786aab8a5fa0 (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 310b5a537a78c358a4cd244bd767c1a517a05459 (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08 (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 8037c5b2b2a447df52542f4d8535895d837bdcbd (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 611e7821c4f83a671455658797336faecc3a5196 (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 5457025fa8ca3c0d2732109513de839e3e797190 (git)
Affected: e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49 (git)
Affected: 979965c33f734a1666af67900408f997ac669c23 (git)
Affected: 5.10.50 , < 5.10.266 (semver)
Affected: 5.12.17 , < 5.13 (semver)
Affected: 5.13.2 , < 5.14 (semver)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "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(\u0026rtpoll_timer);\n  mod_timer(\u0026rtpoll_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\u0027t re-arm itself. Bind the timer to the group\u0027s\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."
        }
      ],
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        {
          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "value": "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-\u003ertpoll_wakeup and wake_up_interruptible() on group-\u003ertpoll_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."
            }
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        "dateUpdated": "2026-08-25T05:40:21.246Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4addb102154b7cf6e2310ccbe20c3c08619e520d"
        },
        {
          "url": "https://git.kernel.org/stable/c/894a9300d7fb2e2951da92e565ae6de7ddfb0a69"
        },
        {
          "url": "https://git.kernel.org/stable/c/1e5ca82eee59caca6988f9d6e859786aab8a5fa0"
        },
        {
          "url": "https://git.kernel.org/stable/c/310b5a537a78c358a4cd244bd767c1a517a05459"
        },
        {
          "url": "https://git.kernel.org/stable/c/806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08"
        },
        {
          "url": "https://git.kernel.org/stable/c/8037c5b2b2a447df52542f4d8535895d837bdcbd"
        },
        {
          "url": "https://git.kernel.org/stable/c/611e7821c4f83a671455658797336faecc3a5196"
        },
        {
          "url": "https://git.kernel.org/stable/c/5457025fa8ca3c0d2732109513de839e3e797190"
        }
      ],
      "title": "sched/psi: Shut down rtpoll_timer in psi_cgroup_free()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74594",
    "datePublished": "2026-08-22T15:31:44.894Z",
    "dateReserved": "2026-08-15T05:44:03.919Z",
    "dateUpdated": "2026-08-25T05:40:21.246Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74594",
      "date": "2026-08-29",
      "epss": "0.00129",
      "percentile": "0.02859"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-24T14:44:20.000Z",
      "cve": "CVE-2026-74594",
      "id": "msrc_CVE-2026-74594",
      "initial_release_date": "2026-08-24T01:10:54.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "sched/psi: Shut down rtpoll_timer in psi_cgroup_free()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74594.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74594\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:31.680\",\"lastModified\":\"2026-08-25T06:18:34.890\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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(\u0026rtpoll_timer);\\n  mod_timer(\u0026rtpoll_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\u0027t re-arm itself. Bind the timer to the group\u0027s\\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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/sched/psi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6bfcb6178925b1fd28c102e53d403091b8f49396\",\"lessThan\":\"4addb102154b7cf6e2310ccbe20c3c08619e520d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"894a9300d7fb2e2951da92e565ae6de7ddfb0a69\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"1e5ca82eee59caca6988f9d6e859786aab8a5fa0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"310b5a537a78c358a4cd244bd767c1a517a05459\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"8037c5b2b2a447df52542f4d8535895d837bdcbd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"611e7821c4f83a671455658797336faecc3a5196\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"5457025fa8ca3c0d2732109513de839e3e797190\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"979965c33f734a1666af67900408f997ac669c23\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.50\",\"lessThan\":\"5.10.266\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.12.17\",\"lessThan\":\"5.13\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.13.2\",\"lessThan\":\"5.14\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/sched/psi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1e5ca82eee59caca6988f9d6e859786aab8a5fa0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/310b5a537a78c358a4cd244bd767c1a517a05459\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4addb102154b7cf6e2310ccbe20c3c08619e520d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5457025fa8ca3c0d2732109513de839e3e797190\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/611e7821c4f83a671455658797336faecc3a5196\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8037c5b2b2a447df52542f4d8535895d837bdcbd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/894a9300d7fb2e2951da92e565ae6de7ddfb0a69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:49:54+00:00",
      "cve": "CVE-2026-74594",
      "id": "CVE-2026-74594",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "48",
      "product_status:known_not_affected": "226",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sched/psi: Shut down rtpoll_timer in psi_cgroup_free()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74594.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.