{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53163", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.388Z", "datePublished": "2026-06-25T08:38:44.108Z", "dateUpdated": "2026-06-25T08:38:44.108Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-25T08:38:44.108Z"}, "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()."}], "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": "3fb7394a837740770f0d6b4b30567e60786a63f2", "lessThan": "a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53", "status": "affected", "versionType": "git"}, {"version": "88614876370aac8ad1050ad785a4c095ba17ac11", "lessThan": "55363fa0a04524d11efeaadee734d2db1756ed27", "status": "affected", "versionType": "git"}, {"version": "3bfdc63936dd4773109b7b8c280c0f3b5ae7d349", "lessThan": "40a25d59e85b3c8709ac2424d44f65610467871e", "status": "affected", "versionType": "git"}, {"version": "d8cce4773c2b23d819baf5abedc62f7b430e8745", "status": "affected", "versionType": "git"}, {"version": "8a1fc8d698ac5e5916e3082a0f74450d71f9611f", "status": "affected", "versionType": "git"}, {"version": "6d52dfcb2a5db86e346cf51f8fcf2071b8085166", "status": "affected", "versionType": "git"}, {"version": "6.1.175", "lessThan": "6.2", "status": "affected", "versionType": "semver"}, {"version": "6.6.140", "lessThan": "6.7", "status": "affected", "versionType": "semver"}, {"version": "6.12.86", "lessThan": "6.13", "status": "affected", "versionType": "semver"}]}, {"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": "6.18.27", "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": "6.18.27", "versionEndExcluding": "6.18.36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0.4", "versionEndExcluding": "7.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.140"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.86"}]}]}], "references": [{"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"}}}}

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{}

{"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"]}