CVE-2026-53163 (GCVE-0-2026-53163)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-07-04 11:50
VLAI
Title
locking/rtmutex: Skip remove_waiter() when waiter is not enqueued
Summary
In the Linux kernel, the following vulnerability has been resolved: locking/rtmutex: Skip remove_waiter() when waiter is not enqueued syzbot triggered the following splat in remove_waiter() via FUTEX_CMP_REQUEUE_PI: KASAN: null-ptr-deref in range [0x0000000000000a88-0x0000000000000a8f] class_raw_spinlock_constructor remove_waiter+0x159/0x1200 kernel/locking/rtmutex.c:1561 rt_mutex_start_proxy_lock+0x103/0x120 futex_requeue+0x10e4/0x20d0 __x64_sys_futex+0x34f/0x4d0 task_blocks_on_rt_mutex() does not arm the waiter upon deadlock detection, leaving waiter->task nil, where 3bfdc63936dd ("rtmutex: Use waiter::task instead of current in remove_waiter()") made this fatal. Furthermore, rt_mutex_start_proxy_lock() should not be calling into remove_waiter() upon a successfully grabbing the rtmutex. 1a1fb985f2e2 ("futex: Handle early deadlock return correctly"), moved the remove_waiter() out of __rt_mutex_start_proxy_lock() (where 'ret' was only ever 0 or < 0) into the wrapper. Tighten this check to account for try_to_take_rt_mutex().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d8cce4773c2b23d819baf5abedc62f7b430e8745 , < 4afda3a1da02129568a3a2f1898aa13e6763bcba (git)
Affected: 8a1fc8d698ac5e5916e3082a0f74450d71f9611f , < 6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48 (git)
Affected: 6d52dfcb2a5db86e346cf51f8fcf2071b8085166 , < 5799f9bd7fee40370b93ab1ddf001cdc7017c14d (git)
Affected: 3fb7394a837740770f0d6b4b30567e60786a63f2 , < a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53 (git)
Affected: 88614876370aac8ad1050ad785a4c095ba17ac11 , < 55363fa0a04524d11efeaadee734d2db1756ed27 (git)
Affected: 3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 , < 40a25d59e85b3c8709ac2424d44f65610467871e (git)
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Linux Linux Affected: 6.1.175 , < 6.1.177 (semver)
Affected: 6.6.140 , < 6.6.144 (semver)
Affected: 6.12.86 , < 6.12.95 (semver)
Affected: 6.18.27 , < 6.18.36 (semver)
Affected: 7.0.4 , < 7.0.13 (semver)
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          "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-\u003etask 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 \u0027ret\u0027 was only ever 0 or \u003c 0) into the wrapper. Tighten this check to\naccount for try_to_take_rt_mutex()."
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        "dateUpdated": "2026-07-04T11:50:59.024Z",
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          "url": "https://git.kernel.org/stable/c/40a25d59e85b3c8709ac2424d44f65610467871e"
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    "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"
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  }
}


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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.

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  • 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.
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