Description
There exists a use-after-free in io_uring in the Linux kernel. Signalfd_poll() and binder_poll() use a waitqueue whose lifetime is the current task. It will send a POLLFREE notification to all waiters before the queue is freed. Unfortunately, the io_uring poll doesn't handle POLLFREE. This allows a use-after-free to occur if a signalfd or binder fd is polled with io_uring poll, and the waitqueue gets freed. We recommend upgrading past commit fc78b2fc21f10c4c9c4d5d659a685710ffa63659
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Kernel
unspecified to < fc78b2fc21f10c4c9c4d5d659a685710ffa63659affected
References
- https://kernel.dance/#fc78b2fc21f10c4c9c4d5d659a685710ffa63659 ↗
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit?h=linux-5.4.y&id=fc78b2fc21f10c4c9c4d5d659a685710ffa63659 ↗
- https://www.debian.org/security/2022/dsa-5257 ↗
- https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html ↗
- https://security.netapp.com/advisory/ntap-20230216-0003/ ↗