CVE-2023-51781: Use After Free
First published: Mon Dec 25 2023(Updated: )
An issue was discovered in the Linux kernel before 6.6.8. atalk_ioctl in net/appletalk/ddp.c has a use-after-free because of an atalk_recvmsg race condition.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >2.6.12<6.6.8 | |
| Linux Kernel | =2.6.12-rc2 | |
| Linux Kernel | =2.6.12-rc3 | |
| Linux Kernel | =2.6.12-rc4 | |
| Linux Kernel | =2.6.12-rc5 | |
| Linux Kernel | =2.6.12-rc6 | |
| Linux Kernel | =6.7-rc1 | |
| Linux Kernel | =6.7-rc2 | |
| Linux Kernel | =6.7-rc3 | |
| Linux Kernel | =6.7-rc4 | |
| Linux Kernel | =6.7-rc5 | |
| Debian Linux | =10.0 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
Remedy
Ensure that /etc/modprobe.d/blacklist-rare-network.conf contains the following lines: # appletalk alias net-pf-5 off
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Reference Links
- https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.8
- https://github.com/torvalds/linux/commit/189ff16722ee36ced4d2a2469d4ab65a8fee4198
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
- https://lists.debian.org/debian-lts-announce/2024/01/msg00005.html
- https://launchpad.net/bugs/cve/CVE-2023-51781
- https://git.kernel.org/linus/189ff16722ee36ced4d2a2469d4ab65a8fee4198
- https://security-tracker.debian.org/tracker/CVE-2023-51781
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-51781
- https://nvd.nist.gov/vuln/detail/CVE-2023-51781
- https://ubuntu.com/security/CVE-2023-51781
Frequently Asked Questions
What is the severity of CVE-2023-51781?
CVE-2023-51781 is classified as a high severity vulnerability due to its potential exploitation in the Linux kernel.
How do I fix CVE-2023-51781?
To fix CVE-2023-51781, update your Linux kernel to version 6.6.8 or later, or apply the specific patches provided by your distribution.
What versions of the Linux kernel are affected by CVE-2023-51781?
CVE-2023-51781 affects all Linux kernel versions prior to 6.6.8, including the 2.6.x series up to 6.7-rc5.
What type of vulnerability is CVE-2023-51781?
CVE-2023-51781 is a use-after-free vulnerability caused by a race condition in atalk_recvmsg within the Linux kernel.
Who is affected by CVE-2023-51781?
Users and systems running vulnerable versions of the Linux kernel, particularly versions between 2.6.12 and 6.6.8, are susceptible to CVE-2023-51781.
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