What’s Vulnerable › Vulnerabilities
CVE-2023-3389: Use after free in io_uring in the Linux Kernel
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-06-28 · updated 2026-10-14
- Weakness: CWE-416
Description
A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation. Racing a io_uring cancel poll request with a linked timeout can cause a UAF in a hrtimer. We recommend upgrading past commit ef7dfac51d8ed961b742218f526bd589f3900a59 (4716c73b188566865bdd79c3a6709696a224ac04 for 5.10 stable and 0e388fce7aec40992eadee654193cad345d62663 for 5.15 stable).
Affected products
- Canonical Ubuntu Linux: 14.04, 16.04, 18.04, 20.04, 22.04
- Debian Linux: 10.0, 11.0
- Linux kernel: from 5.10.162 before 5.10.185; from 5.13 before 6.4 — fixed in 5.10.185, 6.4
How to fix
Upgrade to a fixed version: Linux kernel 5.10.185, 6.4. Check the vendor advisory for mitigations.
References
- http://packetstormsecurity.com/files/174577/Kernel-Live-Patch-Security-Notice-LSN-0097-1.html
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.10.y&id=4716c73b188566865bdd79c3a6709696a224ac04
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.15.y&id=0e388fce7aec40992eadee654193cad345d62663
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef7dfac51d8ed961b742218f526bd589f3900a59
- https://kernel.dance/0e388fce7aec40992eadee654193cad345d62663
- https://kernel.dance/4716c73b188566865bdd79c3a6709696a224ac04
- https://kernel.dance/ef7dfac51d8ed961b742218f526bd589f3900a59
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
- https://security.netapp.com/advisory/ntap-20230731-0001/
- https://www.debian.org/security/2023/dsa-5480
- http://packetstormsecurity.com/files/174577/Kernel-Live-Patch-Security-Notice-LSN-0097-1.html
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.10.y&id=4716c73b188566865bdd79c3a6709696a224ac04
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