CVE-2024-50086: ksmbd: fix user-after-free from session log off
First published: Tue Oct 29 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix user-after-free from session log off There is racy issue between smb2 session log off and smb2 session setup. It will cause user-after-free from session log off. This add session_lock when setting SMB2_SESSION_EXPIRED and referece count to session struct not to free session while it is being used.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <6.1.114 | |
| Linux Kernel | >=6.2<6.6.58 | |
| Linux Kernel | >=6.7<6.11.5 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| Linux Kernel | =6.12-rc3 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 | |
| debian/linux-6.1 | 6.1.119-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/0f62358ce85b2d4c949ef1b648be01b29cec667a
- https://git.kernel.org/stable/c/a9839c37fd813b432988f58a9d9dd59253d3eb2c
- https://git.kernel.org/stable/c/5511999e9615e4318e9142d23b29bd1597befc08
- https://git.kernel.org/stable/c/ee371898b53a9b9b51c02d22a8c31bfb86d45f0d
- https://git.kernel.org/stable/c/7aa8804c0b67b3cb263a472d17f2cb50d7f1a930
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50086
- https://nvd.nist.gov/vuln/detail/CVE-2024-50086
- https://launchpad.net/bugs/cve/CVE-2024-50086
- https://security-tracker.debian.org/tracker/CVE-2024-50086
- https://ubuntu.com/security/CVE-2024-50086
- https://git.kernel.org/linus/7aa8804c0b67b3cb263a472d17f2cb50d7f1a930
Frequently Asked Questions
What is the severity of CVE-2024-50086?
The CVE-2024-50086 has a moderate severity level due to the user-after-free vulnerability in the Linux kernel.
How do I fix CVE-2024-50086?
You can mitigate CVE-2024-50086 by updating the Linux kernel to a version that includes the fix, as detailed in the security advisories.
Which versions of the Linux kernel are affected by CVE-2024-50086?
CVE-2024-50086 affects Linux kernel versions from 6.2 up to, but not including, 6.6.58, as well as some release candidates.
What types of issues does CVE-2024-50086 cause?
CVE-2024-50086 can lead to potential memory corruption due to a race condition during the SMB2 session log off and setup.
Is CVE-2024-50086 a remote exploitation risk?
Yes, CVE-2024-50086 can be exploited remotely under certain conditions, making it important to address promptly.
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