Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: rtmutex: Use waiter::task instead of current in remove_waiter() remove_waiter() is used by the slowlock paths, but it is also used for proxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from futex_requeue(). In the latter case waiter::task is not current, but remove_waiter() operates on current for the dequeue operation. That results in several problems: 1) the rbtree dequeue happens without waiter::task::pi_lock being held 2) the waiter task's pi_blocked_on state is not cleared, which leaves a dangling pointer primed for UAF around. 3) rt_mutex_adjust_prio_chain() operates on the wrong top priority waiter task Use waiter::task instead of current in all related operations in remove_waiter() to cure those problems. [ tglx: Fixup rt_mutex_adjust_prio_chain(), add a comment and amend the changelog ]
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 before f3fa3424bceb128d2be4b3745506b22844b87db7; affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 before 838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd; affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 before d8cce4773c2b23d819baf5abedc62f7b430e8745; affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 before 8a1fc8d698ac5e5916e3082a0f74450d71f9611f; affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 before 6d52dfcb2a5db86e346cf51f8fcf2071b8085166; affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 before 3fb7394a837740770f0d6b4b30567e60786a63f2; affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 before 88614876370aac8ad1050ad785a4c095ba17ac11; affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 before 3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 |
| Linux / Linux | affected 2.6.39; unaffected 0 before 2.6.39; unaffected 5.10.261 through 5.10.*; unaffected 5.15.212 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.140 through 6.6.*; unaffected 6.12.86 through 6.12.*; unaffected 6.18.27 through 6.18.*; unaffected 7.0.4 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/f3fa3424bceb128d2be4b3745506b22844b87db7
- https://git.kernel.org/stable/c/838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd
- https://git.kernel.org/stable/c/d8cce4773c2b23d819baf5abedc62f7b430e8745
- https://git.kernel.org/stable/c/8a1fc8d698ac5e5916e3082a0f74450d71f9611f
- https://git.kernel.org/stable/c/6d52dfcb2a5db86e346cf51f8fcf2071b8085166
- https://git.kernel.org/stable/c/3fb7394a837740770f0d6b4b30567e60786a63f2
- https://git.kernel.org/stable/c/88614876370aac8ad1050ad785a4c095ba17ac11
- https://git.kernel.org/stable/c/3bfdc63936dd4773109b7b8c280c0f3b5ae7d349
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.
No English description supplied.