Executive Summary

CVE-2023-4622 is a use‑after‑free flaw in the Linux kernel’s af_unix module. The race in unix_stream_sendpage() allows an attacker to access a freed skb without proper locking, enabling local privilege escalation. The issue is fixed by commit 790c2f9d15b594350ae9bca7b236f2b1859de02c. No current CISA KEV listing.

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Authoritative CVE Metadata - CVSS Base Score: 7.8 (HIGH) - Published: 2023-09-06T14:15:12.193 - Last Modified: 2026-09-11T16:12:18.457

Original Description: 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.

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