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
CVSS breakdown
CVSS 3.1
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected products
- Linux / Kernelunspecified – fc78b2fc21f10c4c9c4d5d659a685710ffa63659
References
- MISChttps://kernel.dance/#fc78b2fc21f10c4c9c4d5d659a685710ffa63659
- MISChttps://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit?h=linux-5.4.y&id=fc78b2fc21f10c4c9c4d5d659a685710ffa63659
- VENDOR_ADVISORYhttps://www.debian.org/security/2022/dsa-5257
- MAILING_LISThttps://lists.debian.org/debian-lts-announce/2022/11/msg00001.html
- MISChttps://security.netapp.com/advisory/ntap-20230216-0003/