Use After Free in Linux Kernel
CVE-2023-3389
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).
Vulnerability class: Use-After-Free
EPSS: 0.007 (50.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux Kernel — versions 5.13, 5.10.162
- Linux Linux_kernel
- Canonical Ubuntu_linux — versions 14.04, 16.04, 18.04
- Debian Debian_linux — versions 10.0, 11.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve-coordination@google.com (Patch, Mailing List, patch)
- cve-coordination@google.com (Patch, Mailing List, patch)
- cve-coordination@google.com (Patch)
- cve-coordination@google.com (Patch)
- cve-coordination@google.com (Patch, Mailing List, patch)
- cve-coordination@google.com (Patch)
- cve-coordination@google.com (Third Party Advisory)
- cve-coordination@google.com (Third Party Advisory)
- cve-coordination@google.com (VDB Entry, Third Party Advisory)
- cve-coordination@google.com (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-3389?
- CVE-2023-3389 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2023-06-28.
- How severe is CVE-2023-3389?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2023-3389 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.