high
7.8
CWE
416
Advisory Published
Updated

CVE-2023-4622: Use-after-free in Linux kernel's af_unix component

First published: Wed Sep 06 2023(Updated: )

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.

Credit: cve-coordination@google.com cve-coordination@google.com cve-coordination@google.com

Affected SoftwareAffected VersionHow to fix
redhat/Kernel<6.4.12
6.4.12
Linux Kernel<=6.4.15
Debian GNU/Linux=12.0
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.13-1
Android
Linux Kernel>=4.2<6.1.47
Debian=10.0
Debian=12.0
IBM Security Verify Governance - Identity Manager<=ISVG 10.0.2
IBM Security Verify Governance, Identity Manager<=ISVG 10.0.2

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.1.y&id=790c2f9d15b594350ae9bca7b236f2b1859de02c

Remedy

https://kernel.dance/790c2f9d15b594350ae9bca7b236f2b1859de02c

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

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.

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