{"api_version":"1","generated_at":"2026-07-04T18:20:04+00:00","cve":"CVE-2026-53163","urls":{"html":"https://cve.report/CVE-2026-53163","api":"https://cve.report/api/cve/CVE-2026-53163.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53163","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53163"},"summary":{"title":"locking/rtmutex: Skip remove_waiter() when waiter is not enqueued","description":"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().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-25 09:16:33","updated_at":"2026-07-04 12:16:59"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48","name":"https://git.kernel.org/stable/c/6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4afda3a1da02129568a3a2f1898aa13e6763bcba","name":"https://git.kernel.org/stable/c/4afda3a1da02129568a3a2f1898aa13e6763bcba","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/55363fa0a04524d11efeaadee734d2db1756ed27","name":"https://git.kernel.org/stable/c/55363fa0a04524d11efeaadee734d2db1756ed27","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5799f9bd7fee40370b93ab1ddf001cdc7017c14d","name":"https://git.kernel.org/stable/c/5799f9bd7fee40370b93ab1ddf001cdc7017c14d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53","name":"https://git.kernel.org/stable/c/a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/40a25d59e85b3c8709ac2424d44f65610467871e","name":"https://git.kernel.org/stable/c/40a25d59e85b3c8709ac2424d44f65610467871e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53163","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53163","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d8cce4773c2b23d819baf5abedc62f7b430e8745 4afda3a1da02129568a3a2f1898aa13e6763bcba git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8a1fc8d698ac5e5916e3082a0f74450d71f9611f 6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6d52dfcb2a5db86e346cf51f8fcf2071b8085166 5799f9bd7fee40370b93ab1ddf001cdc7017c14d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3fb7394a837740770f0d6b4b30567e60786a63f2 a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 88614876370aac8ad1050ad785a4c095ba17ac11 55363fa0a04524d11efeaadee734d2db1756ed27 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 40a25d59e85b3c8709ac2424d44f65610467871e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.175 6.1.177 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.140 6.6.144 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.86 6.12.95 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.27 6.18.36 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.0.4 7.0.13 semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"53163","cve":"CVE-2026-53163","epss":"0.001730000","percentile":"0.070010000","score_date":"2026-07-03","updated_at":"2026-07-04 00:02:19"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/locking/rtmutex.c","kernel/locking/rtmutex_api.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"4afda3a1da02129568a3a2f1898aa13e6763bcba","status":"affected","version":"d8cce4773c2b23d819baf5abedc62f7b430e8745","versionType":"git"},{"lessThan":"6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48","status":"affected","version":"8a1fc8d698ac5e5916e3082a0f74450d71f9611f","versionType":"git"},{"lessThan":"5799f9bd7fee40370b93ab1ddf001cdc7017c14d","status":"affected","version":"6d52dfcb2a5db86e346cf51f8fcf2071b8085166","versionType":"git"},{"lessThan":"a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53","status":"affected","version":"3fb7394a837740770f0d6b4b30567e60786a63f2","versionType":"git"},{"lessThan":"55363fa0a04524d11efeaadee734d2db1756ed27","status":"affected","version":"88614876370aac8ad1050ad785a4c095ba17ac11","versionType":"git"},{"lessThan":"40a25d59e85b3c8709ac2424d44f65610467871e","status":"affected","version":"3bfdc63936dd4773109b7b8c280c0f3b5ae7d349","versionType":"git"}]},{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/locking/rtmutex.c","kernel/locking/rtmutex_api.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"6.1.177","status":"affected","version":"6.1.175","versionType":"semver"},{"lessThan":"6.6.144","status":"affected","version":"6.6.140","versionType":"semver"},{"lessThan":"6.12.95","status":"affected","version":"6.12.86","versionType":"semver"},{"lessThan":"6.18.36","status":"affected","version":"6.18.27","versionType":"semver"},{"lessThan":"7.0.13","status":"affected","version":"7.0.4","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.177","versionStartIncluding":"6.1.175","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.144","versionStartIncluding":"6.6.140","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.95","versionStartIncluding":"6.12.86","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.36","versionStartIncluding":"6.18.27","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.13","versionStartIncluding":"7.0.4","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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()."}],"providerMetadata":{"dateUpdated":"2026-07-04T11:50:59.024Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53163","datePublished":"2026-06-25T08:38:44.108Z","dateReserved":"2026-06-09T07:44:35.388Z","dateUpdated":"2026-07-04T11:50:59.024Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-25 09:16:33","lastModifiedDate":"2026-07-04 12:16:59","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53163","Ordinal":"1","Title":"locking/rtmutex: Skip remove_waiter() when waiter is not enqueue","CVE":"CVE-2026-53163","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53163","Ordinal":"1","NoteData":"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().","Type":"Description","Title":"locking/rtmutex: Skip remove_waiter() when waiter is not enqueue"}]}}}