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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (50.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Linux Kernel — versions 5.13, 5.10.162
- Linux Kernel
- Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
- Debian Linux — versions 10.0, 11.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/ (Patch, Mailing List, patch)
- git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/ (Patch, Mailing List, patch)
- kernel.dance/0e388fce7aec40992eadee654193cad345d62663 (Patch)
- kernel.dance/4716c73b188566865bdd79c3a6709696a224ac04 (Patch)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, patch)
- kernel.dance/ef7dfac51d8ed961b742218f526bd589f3900a59 (Patch)
- security.netapp.com/advisory/ntap-20230731-0001/ (Third Party Advisory)
- www.debian.org/security/2023/dsa-5480 (Third Party Advisory)
- packetstormsecurity.com/files/174577/Kernel-Live-Patch-Security-Notice-LSN-0097… (VDB Entry, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/10/msg00027.html (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.