Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix tp_meter counter underflow during shutdown batadv_tp_sender_shutdown() unconditionally decrements the "sending" atomic counter. If multiple paths (e.g. timeout, user cancel, and normal finish) call this function, the counter can underflow to -1. Since the sender logic treats any non-zero value as "still sending", a negative value causes the sender kthread to loop indefinitely. This leads to a use-after-free when the interface is removed while the zombie thread is still active. Fix this by using atomic_xchg() to ensure the counter only transitions from 1 to 0 once. [sven: added missing change in batadv_tp_send]
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before e75e2ab463b5b34df6b98f94d740aff327ce9f6b; affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before abae88fa254f2981d39ac003a7b302528a22af64; affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before c66d20a3ff095e3f000551d208ec2606616db15c; affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before c1bac194733aabd731aafa6a01350c229e187dba; affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before 01cefc5923889e29dbb5f281c3d457714ceb9c00; affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before 90ae3eae06b7b8ab9f6250b9497c860915b4c17b; affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before aeae11c5dad9cd0d50723890bdd866f8e6db2e7d; affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before 94f3b133168d1c49895e7cc6afbcf1cc0b354602 |
| Linux / Linux | affected 4.8; unaffected 0 before 4.8; unaffected 5.10.258 through 5.10.*; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.142 through 6.6.*; unaffected 6.12.92 through 6.12.*; unaffected 6.18.34 through 6.18.*; unaffected 7.0.11 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/e75e2ab463b5b34df6b98f94d740aff327ce9f6b
- https://git.kernel.org/stable/c/abae88fa254f2981d39ac003a7b302528a22af64
- https://git.kernel.org/stable/c/c66d20a3ff095e3f000551d208ec2606616db15c
- https://git.kernel.org/stable/c/c1bac194733aabd731aafa6a01350c229e187dba
- https://git.kernel.org/stable/c/01cefc5923889e29dbb5f281c3d457714ceb9c00
- https://git.kernel.org/stable/c/90ae3eae06b7b8ab9f6250b9497c860915b4c17b
- https://git.kernel.org/stable/c/aeae11c5dad9cd0d50723890bdd866f8e6db2e7d
- https://git.kernel.org/stable/c/94f3b133168d1c49895e7cc6afbcf1cc0b354602