CVE-2026-53163
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
locking/rtmutex: Skip remove_waiter() when waiter is not enqueued
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().
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| f3fa3424bceb128d2be4b3745506b22844b87db7 | affected | git | bfbc047ceb42c0e1fac8f3a155d4548a8bbe76b1 | Unavailable | None listed |
| 838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd | affected | git | 4ffacf76a457b7ca8ac05f5df8740b0d8f53574a | Unavailable | None listed |
| d8cce4773c2b23d819baf5abedc62f7b430e8745 | affected | git | 4afda3a1da02129568a3a2f1898aa13e6763bcba | Unavailable | None listed |
| 8a1fc8d698ac5e5916e3082a0f74450d71f9611f | affected | git | 6707d7e0b71748cb3cd95bad81dae5fe1b3c8f48 | Unavailable | None listed |
| 6d52dfcb2a5db86e346cf51f8fcf2071b8085166 | affected | git | 5799f9bd7fee40370b93ab1ddf001cdc7017c14d | Unavailable | None listed |
| 3fb7394a837740770f0d6b4b30567e60786a63f2 | affected | git | a388e3dfaf9538a680de5ed43a8ebb5dd45b6e53 | Unavailable | None listed |
| 88614876370aac8ad1050ad785a4c095ba17ac11 | affected | git | 55363fa0a04524d11efeaadee734d2db1756ed27 | Unavailable | None listed |
| 3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 | affected | git | 40a25d59e85b3c8709ac2424d44f65610467871e | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 6.1.175 | affected | semver | 6.1.177 | Unavailable | None listed |
| 6.6.140 | affected | semver | 6.6.144 | Unavailable | None listed |
| 6.12.86 | affected | semver | 6.12.95 | Unavailable | None listed |
| 6.18.27 | affected | semver | 6.18.36 | Unavailable | None listed |
| 7.0.4 | affected | semver | 7.0.13 | Unavailable | None listed |