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().
References
Configurations
Configuration 1 (hide)
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History
24 Jul 2026, 15:18
| Type | Values Removed | Values Added |
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| References |
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07 Jul 2026, 18:18
| Type | Values Removed | Values Added |
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| References | () https://git.kernel.org/stable/c/40a25d59e85b3c8709ac2424d44f65610467871e - Patch | |
| References | () https://git.kernel.org/stable/c/4afda3a1da02129568a3a2f1898aa13e6763bcba - Patch | |
| References | () https://git.kernel.org/stable/c/55363fa0a04524d11efeaadee734d2db1756ed27 - Patch | |
| References | () https://git.kernel.org/stable/c/5799f9bd7fee40370b93ab1ddf001cdc7017c14d - Patch | |
| References | () https://git.kernel.org/stable/c/6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48 - Patch | |
| References | () https://git.kernel.org/stable/c/a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53 - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* |
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| CWE | CWE-476 | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| First Time |
Linux linux Kernel
Linux |
04 Jul 2026, 12:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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25 Jun 2026, 09:16
| Type | Values Removed | Values Added |
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| New CVE |
Information
Published : 2026-06-25 09:16
Updated : 2026-07-24 15:18
NVD link : CVE-2026-53163
Mitre link : CVE-2026-53163
CVE.ORG link : CVE-2026-53163
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference