CVE-2026-53163

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Tighten this check to\naccount for try_to_take_rt_mutex()."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/locking/rtmutex.c", "kernel/locking/rtmutex_api.c"], "versions": [{"version": "f3fa3424bceb128d2be4b3745506b22844b87db7", "lessThan": "bfbc047ceb42c0e1fac8f3a155d4548a8bbe76b1", "status": "affected", "versionType": "git"}, {"version": "838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd", "lessThan": "4ffacf76a457b7ca8ac05f5df8740b0d8f53574a", "status": "affected", "versionType": "git"}, {"version": "d8cce4773c2b23d819baf5abedc62f7b430e8745", "lessThan": "4afda3a1da02129568a3a2f1898aa13e6763bcba", "status": "affected", "versionType": "git"}, {"version": "8a1fc8d698ac5e5916e3082a0f74450d71f9611f", "lessThan": "6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48", "status": "affected", "versionType": "git"}, {"version": "6d52dfcb2a5db86e346cf51f8fcf2071b8085166", "lessThan": "5799f9bd7fee40370b93ab1ddf001cdc7017c14d", "status": "affected", "versionType": "git"}, {"version": "3fb7394a837740770f0d6b4b30567e60786a63f2", "lessThan": "a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53", "status": "affected", "versionType": "git"}, {"version": "88614876370aac8ad1050ad785a4c095ba17ac11", "lessThan": "55363fa0a04524d11efeaadee734d2db1756ed27", "status": "affected", "versionType": "git"}, {"version": "3bfdc63936dd4773109b7b8c280c0f3b5ae7d349", "lessThan": "40a25d59e85b3c8709ac2424d44f65610467871e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/locking/rtmutex.c", "kernel/locking/rtmutex_api.c"], "versions": [{"version": "6.1.175", "lessThan": "6.1.177", "status": "affected", "versionType": "semver"}, {"version": "6.6.140", "lessThan": "6.6.144", "status": "affected", "versionType": "semver"}, {"version": "6.12.86", "lessThan": "6.12.95", "status": "affected", "versionType": "semver"}, {"version": "6.18.27", "lessThan": "6.18.36", "status": "affected", "versionType": "semver"}, {"version": "7.0.4", "lessThan": "7.0.13", "status": "affected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.175", "versionEndExcluding": "6.1.177"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.140", "versionEndExcluding": "6.6.144"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.86", "versionEndExcluding": "6.12.95"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.27", "versionEndExcluding": "6.18.36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0.4", "versionEndExcluding": "7.0.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/bfbc047ceb42c0e1fac8f3a155d4548a8bbe76b1"}, {"url": "https://git.kernel.org/stable/c/4ffacf76a457b7ca8ac05f5df8740b0d8f53574a"}, {"url": "https://git.kernel.org/stable/c/4afda3a1da02129568a3a2f1898aa13e6763bcba"}, {"url": "https://git.kernel.org/stable/c/6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48"}, {"url": "https://git.kernel.org/stable/c/5799f9bd7fee40370b93ab1ddf001cdc7017c14d"}, {"url": "https://git.kernel.org/stable/c/a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53"}, {"url": "https://git.kernel.org/stable/c/55363fa0a04524d11efeaadee734d2db1756ed27"}, {"url": "https://git.kernel.org/stable/c/40a25d59e85b3c8709ac2424d44f65610467871e"}], "title": "locking/rtmutex: Skip remove_waiter() when waiter is not enqueued", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-53163", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:21:24.651660Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:24:05.662Z"}}]}}

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Tighten this check to\naccount for try_to_take_rt_mutex()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.177", "versionStartIncluding": "6.1.175"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.144", "versionStartIncluding": "6.6.140"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.95", "versionStartIncluding": "6.12.86"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.36", "versionStartIncluding": "6.18.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.13", "versionStartIncluding": "7.0.4"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-24T14:33:48.972Z"}}}, "cveMetadata": {"cveId": "CVE-2026-53163", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:24:05.662Z", "dateReserved": "2026-06-09T07:44:35.388Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-06-25T08:38:44.108Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*", "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*", "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlocking/rtmutex: Skip remove_waiter() when waiter is not enqueued\n\nsyzbot triggered the following splat in remove_waiter() via\nFUTEX_CMP_REQUEUE_PI:\n\n KASAN: null-ptr-deref in range [0x0000000000000a88-0x0000000000000a8f]\n class_raw_spinlock_constructor\n remove_waiter+0x159/0x1200 kernel/locking/rtmutex.c:1561\n rt_mutex_start_proxy_lock+0x103/0x120\n futex_requeue+0x10e4/0x20d0\n __x64_sys_futex+0x34f/0x4d0\n\ntask_blocks_on_rt_mutex() does not arm the waiter upon deadlock detection,\nleaving waiter->task nil, where 3bfdc63936dd (\"rtmutex: Use waiter::task instead\nof current in remove_waiter()\") made this fatal.\n\nFurthermore, rt_mutex_start_proxy_lock() should not be calling into remove_waiter()\nupon a successfully grabbing the rtmutex. 1a1fb985f2e2 (\"futex: Handle early deadlock\nreturn correctly\"), moved the remove_waiter() out of __rt_mutex_start_proxy_lock()\n(where 'ret' was only ever 0 or < 0) into the wrapper. Tighten this check to\naccount for try_to_take_rt_mutex()."}], "id": "CVE-2026-53163", "lastModified": "2026-11-06T17:18:11.883", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53163", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:21:24.651660Z", "version": "2.0.3"}}]}, "published": "2026-06-25T09:16:33.703", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/40a25d59e85b3c8709ac2424d44f65610467871e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4afda3a1da02129568a3a2f1898aa13e6763bcba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4ffacf76a457b7ca8ac05f5df8740b0d8f53574a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/55363fa0a04524d11efeaadee734d2db1756ed27"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5799f9bd7fee40370b93ab1ddf001cdc7017c14d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bfbc047ceb42c0e1fac8f3a155d4548a8bbe76b1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: locking/rtmutex: Skip remove_waiter() when waiter is not enqueued", "id": "2492704", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492704"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel's `rtmutex` locking mechanism. A local attacker could trigger a null-pointer dereference by using the `FUTEX_CMP_REQUEUE_PI` operation. This vulnerability occurs because the `remove_waiter()` function is called when the waiter is not properly enqueued, leading to a system crash and a denial of service (DoS). This issue was detected by KASAN (Kernel Address Sanitizer)."], "name": "CVE-2026-53163", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53163\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53163\nhttps://lore.kernel.org/linux-cve-announce/2026062550-CVE-2026-53163-0eb8@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3fb7394a837740770f0d6b4b30567e60786a63f2,a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[88614876370aac8ad1050ad785a4c095ba17ac11,55363fa0a04524d11efeaadee734d2db1756ed27)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3bfdc63936dd4773109b7b8c280c0f3b5ae7d349,40a25d59e85b3c8709ac2424d44f65610467871e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "d8cce4773c2b23d819baf5abedc62f7b430e8745"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "8a1fc8d698ac5e5916e3082a0f74450d71f9611f"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "6d52dfcb2a5db86e346cf51f8fcf2071b8085166"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.175,6.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.140,6.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.86,6.13)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.27,6.18.36)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[7.0.4,7.0.13)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-06-25T11:45:03.803332+00:00", "updated": "2026-06-26T13:30:16.967639+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}