Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.1, < 5.4.212 |
| Debian | Debian Linux | 10.0 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit?h=linux-Mailing ListPatchVendor Advisory
- https://kernel.dance/#fc78b2fc21f10c4c9c4d5d659a685710ffa63659PatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00001.htmlMailing ListThird Party Advisory
- https://security.netapp.com/advisory/ntap-20230216-0003/Third Party Advisory
- https://www.debian.org/security/2022/dsa-5257Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit?h=linux-Mailing ListPatchVendor Advisory
- https://kernel.dance/#fc78b2fc21f10c4c9c4d5d659a685710ffa63659PatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00001.htmlMailing ListThird Party Advisory
- https://security.netapp.com/advisory/ntap-20230216-0003/Third Party Advisory
- https://www.debian.org/security/2022/dsa-5257Third Party Advisory
FAQ
What is CVE-2022-3176?
CVE-2022-3176 is a vulnerability with a CVSS score of 7.8 (HIGH). 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...
How severe is CVE-2022-3176?
CVE-2022-3176 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-3176?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.