CVE-2023-2612: shiftfs lock unbalance in Ubuntu-specific kernels
First published: Tue May 30 2023(Updated: )
Jean-Baptiste Cayrou discovered that the shiftfs file system in the Ubuntu Linux kernel contained a race condition when handling inode locking in some situations. A local attacker could use this to cause a denial of service (kernel deadlock).
Credit: security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Ubuntu | =20.04 | |
| Ubuntu | =22.04 | |
| Ubuntu | =22.10 |
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Reference Links
- https://ubuntu.com/security/CVE-2023-2612
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/kinetic/commit/?id=02b47547824b1cd0d55c6744f91886f04de8947e
- http://packetstormsecurity.com/files/173087/Kernel-Live-Patch-Security-Notice-LSN-0095-1.html
- https://ubuntu.com/security/notices/USN-6122-1
- https://ubuntu.com/security/notices/USN-6123-1
- https://ubuntu.com/security/notices/USN-6124-1
- https://ubuntu.com/security/notices/USN-6127-1
- https://security-tracker.debian.org/tracker/CVE-2023-2612
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2612
- https://nvd.nist.gov/vuln/detail/CVE-2023-2612
- https://launchpad.net/bugs/cve/CVE-2023-2612
Frequently Asked Questions
What is the severity of CVE-2023-2612?
CVE-2023-2612 has a severity rating that allows for local denial of service via a kernel deadlock.
How do I fix CVE-2023-2612?
To fix CVE-2023-2612, update your Ubuntu system to the latest kernel version provided by Canonical.
Which versions of Ubuntu are affected by CVE-2023-2612?
CVE-2023-2612 affects Ubuntu Linux versions 20.04, 22.04, and 22.10.
What is the nature of the vulnerability in CVE-2023-2612?
CVE-2023-2612 involves a race condition in the shiftfs file system related to inode locking.
Can CVE-2023-2612 be exploited remotely?
CVE-2023-2612 requires local access to exploit, making it less of a risk for remote attacks.
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