#VU100616 Use-after-free in Linux kernel - CVE-2024-50286

Vulnerability identifier: #VU100616

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-50286

CWE-ID: CWE-416

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the ksmbd_expire_session() and ksmbd_sessions_deregister() functions in fs/smb/server/mgmt/user_session.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://git.kernel.org/stable/c/f56446ba5378d19e31040b548a14ee9a8f1500ea
https://git.kernel.org/stable/c/e923503a56b3385b64ae492e3225e4623f560c5b
https://git.kernel.org/stable/c/e7a2ad2044377853cf8c59528dac808a08a99c72
https://git.kernel.org/stable/c/0a77715db22611df50b178374c51e2ba0d58866e

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.