CVE-2026-43499 (GCVE-0-2026-43499)

Vulnerability from cvelistv5 – Published: 2026-05-21 12:17 – Updated: 2026-08-05 12:28
VLAI
Title
rtmutex: Use waiter::task instead of current in remove_waiter()
Summary
In the Linux kernel, the following vulnerability has been resolved: rtmutex: Use waiter::task instead of current in remove_waiter() remove_waiter() is used by the slowlock paths, but it is also used for proxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from futex_requeue(). In the latter case waiter::task is not current, but remove_waiter() operates on current for the dequeue operation. That results in several problems: 1) the rbtree dequeue happens without waiter::task::pi_lock being held 2) the waiter task's pi_blocked_on state is not cleared, which leaves a dangling pointer primed for UAF around. 3) rt_mutex_adjust_prio_chain() operates on the wrong top priority waiter task Use waiter::task instead of current in all related operations in remove_waiter() to cure those problems. [ tglx: Fixup rt_mutex_adjust_prio_chain(), add a comment and amend the changelog ]
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
Linux Linux Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < f3fa3424bceb128d2be4b3745506b22844b87db7 (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < 838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < d8cce4773c2b23d819baf5abedc62f7b430e8745 (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < 8a1fc8d698ac5e5916e3082a0f74450d71f9611f (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < 6d52dfcb2a5db86e346cf51f8fcf2071b8085166 (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < 3fb7394a837740770f0d6b4b30567e60786a63f2 (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < 88614876370aac8ad1050ad785a4c095ba17ac11 (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < 3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.39
Unaffected: 0 , < 2.6.39 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.86 , ≤ 6.12.* (semver)
Unaffected: 6.18.27 , ≤ 6.18.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - The vulnerable code is reached through the futex(2) syscall (FUTEX_CMP_REQUEUE_PI \u2192 futex_requeue \u2192 rt_mutex_start_proxy_lock), which requires local access to issue syscalls and is not reachable over any network.\nAC:L - The attacker controls all the threads and PI-futexes involved and can deterministically construct the deadlock-detection error that drives the proxy-lock rollback into remove_waiter(); the resulting UAF/corruption is reliably triggerable without depending on conditions outside the attacker\u0027s control.\nPR:L - Any basic unprivileged local user can call futex() with FUTEX_CMP_REQUEUE_PI \u2014 no capabilities, root, or namespaces are required.\nUI:N - The bug is triggered entirely by the attacker\u0027s own threads and syscalls; no action by any other user is needed.\nS:U - The corruption is confined to kernel memory within the same security authority; it is a standard local kernel privilege issue with no cross-boundary (VM/IOMMU) escape.\nC:H - The dangling pi_blocked_on pointer and rbtree dequeue under the wrong pi_lock give a use-after-free over reclaimed stack memory, which can be leveraged to read controlled kernel memory contents.\nI:H - The UAF and unsynchronized rbtree manipulation provide a write primitive into kernel data structures, enabling memory corruption exploitable for control-flow hijacking and privilege escalation.\nA:H - The dangling pointer dereference and PI-chain corruption readily cause kernel oops/panic, so availability impact is high."
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    "dateReserved": "2026-05-01T14:12:56.014Z",
    "dateUpdated": "2026-08-05T12:28:22.054Z",
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      "date": "2026-08-14",
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      "cve": "CVE-2026-43499",
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      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
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      "title": "rtmutex: Use waiter::task instead of current in remove_waiter()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-43499.json",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43499\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-21T13:16:19.300\",\"lastModified\":\"2026-07-24T15:17:20.787\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nrtmutex: Use waiter::task instead of current in remove_waiter()\\n\\nremove_waiter() is used by the slowlock paths, but it is also used for\\nproxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from\\nfutex_requeue().\\n\\nIn the latter case waiter::task is not current, but remove_waiter()\\noperates on current for the dequeue operation. That results in several\\nproblems:\\n\\n  1) the rbtree dequeue happens without waiter::task::pi_lock being held\\n\\n  2) the waiter task\u0027s pi_blocked_on state is not cleared, which leaves a\\n     dangling pointer primed for UAF around.\\n\\n  3) rt_mutex_adjust_prio_chain() operates on the wrong top priority waiter\\n     task\\n\\nUse waiter::task instead of current in all related operations in\\nremove_waiter() to cure those problems.\\n\\n[ tglx: Fixup rt_mutex_adjust_prio_chain(), add a comment and amend the\\n  \\tchangelog ]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nrtmutex: Usar waiter::task en lugar de current en remove_waiter()\\n\\nremove_waiter() es usado por las rutas de slowlock, pero tambi\u00e9n es usado para la reversi\u00f3n de bloqueo de proxy en rt_mutex_start_proxy_lock() cuando es invocado desde futex_requeue().\\n\\nEn este \u00faltimo caso, waiter::task no es current, pero remove_waiter() opera en current para la operaci\u00f3n de desencolado. Eso resulta en varios problemas:\\n\\n  1) el desencolado de rbtree ocurre sin que waiter::task::pi_lock est\u00e9 retenido\\n\\n  2) el estado pi_blocked_on de la tarea de espera no se borra, lo que deja un puntero colgante preparado para UAF.\\n\\n  3) rt_mutex_adjust_prio_chain() opera en la tarea de espera de m\u00e1xima prioridad incorrecta\\n\\nUsar waiter::task en lugar de current en todas las operaciones relacionadas en remove_waiter() para solucionar esos problemas.\\n\\n[ tglx: Corregir rt_mutex_adjust_prio_chain(), a\u00f1adir un comentario y modificar el registro de cambios ]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/locking/rtmutex.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\"lessThan\":\"f3fa3424bceb128d2be4b3745506b22844b87db7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\"lessThan\":\"838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\"lessThan\":\"d8cce4773c2b23d819baf5abedc62f7b430e8745\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\"lessThan\":\"8a1fc8d698ac5e5916e3082a0f74450d71f9611f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\"lessThan\":\"6d52dfcb2a5db86e346cf51f8fcf2071b8085166\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\"lessThan\":\"3fb7394a837740770f0d6b4b30567e60786a63f2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\"lessThan\":\"88614876370aac8ad1050ad785a4c095ba17ac11\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\"lessThan\":\"3bfdc63936dd4773109b7b8c280c0f3b5ae7d349\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/locking/rtmutex.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.39\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.39\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.86\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.27\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.4\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.39\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"0C6D7D14-6525-4171-992F-7F8ADC8215B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"A1A92866-F406-43B5-B2D1-CFC274753E9D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.86\",\"matchCriteriaId\":\"55DA1C62-9991-451E-B8A8-E0004E00F789\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.27\",\"matchCriteriaId\":\"A10AC84F-C058-47D5-85B4-E6E51A613B74\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.4\",\"matchCriteriaId\":\"CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3bfdc63936dd4773109b7b8c280c0f3b5ae7d349\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3fb7394a837740770f0d6b4b30567e60786a63f2\",\"source\":\"416baaa9-dc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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-20T08:37:08+00:00",
      "cve": "CVE-2026-43499",
      "id": "CVE-2026-43499",
      "initial_release_date": "2026-05-21T00:00:00+00:00",
      "product_status:fixed": "2188",
      "product_status:known_affected": "22",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: rtmutex: Use waiter::task instead of current in remove_waiter()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43499.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-13T16:28:11Z",
      "cve": "CVE-2026-43499",
      "id": "CVE-2026-43499",
      "initial_release_date": "2026-05-22T02:20:03Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "441",
      "product_status:recommended": "680",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43499",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43499.json",
      "version": "26"
    }
  }
}



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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.