CVE-2023-4622: Use-after-free in Linux kernel's af_unix component
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.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is CVE-2023-4622?
CVE-2023-4622 is a use-after-free vulnerability in the Linux kernel's af_unix component that can be exploited to achieve local privilege escalation.
What is the severity of CVE-2023-4622?
The severity of CVE-2023-4622 is high (7.8).
How can CVE-2023-4622 be exploited?
CVE-2023-4622 can be exploited by using the unix_stream_sendpage() function to add data to the last skb in the peer's recv queue without locking the queue, creating a race condition.
Which software is affected by CVE-2023-4622?
The Linux kernel versions up to and including 6.4.15 and Debian Linux version 12.0 are affected by CVE-2023-4622.
How can I fix CVE-2023-4622?
To fix CVE-2023-4622, update the Linux kernel to versions 6.1.52-1 or higher and Debian Linux to version 6.5.3-1 or higher.