Use After Free in Linux Kernel
CVE-2023-4622
A use-after-free vulnerability in the Linux kernel's af_unix component can be exploited to achieve local privilege escalation. The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. Thus there is a race where unix_stream_sendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free. We recommend upgrading past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c.
Vulnerability class: Use-After-Free
EPSS: 0.005 (43.9th 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 4.2
- Linux Linux_kernel
- Debian Debian_linux — versions 10.0, 12.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve-coordination@google.com (Patch, Mailing List, patch, Issue Tracking, Vendor Advisory)
- cve-coordination@google.com (Patch, Vendor Advisory)
- cve-coordination@google.com (Third Party Advisory)
- cve-coordination@google.com (Mailing List, Third Party Advisory)
- cve-coordination@google.com
- cve-coordination@google.com
Frequently asked questions
- What is CVE-2023-4622?
- CVE-2023-4622 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2023-09-06.
- How severe is CVE-2023-4622?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2023-4622 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.