Use After Free in Linux Kernel
CVE-2023-2236
A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation. Both io_install_fixed_file and its callers call fput in a file in case of an error, causing a reference underflow which leads to a use-after-free vulnerability. We recommend upgrading past commit 9d94c04c0db024922e886c9fd429659f22f48ea4.
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: 0.004 (35.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Linux Kernel — versions 5.19
- Linux Kernel
- NetApp Hci Baseboard Management Controller — versions h300s, h410c, h410s
Weakness classification (CWE)
References
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Exploit, Patch, Mailing List, patch)
- kernel.dance/9d94c04c0db024922e886c9fd429659f22f48ea4 (Exploit, Patch)
- security.netapp.com/advisory/ntap-20230601-0010/ (Vendor Advisory)
Frequently asked questions
- What is CVE-2023-2236?
- CVE-2023-2236 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2023-05-01.
- How severe is CVE-2023-2236?
- High severity. CVSS v3 base score is 7.8 out of 10.