{"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":"2026-07-04T11:50:59.024Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-07-04T11:50:59.024Z"},"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":"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/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"}}}}