#VU93322 Use-after-free in Linux kernel - CVE-2024-39463

Vulnerability identifier: #VU93322

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-2024-39463

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 v9fs_cached_dentry_delete() function in fs/9p/vfs_dentry.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/cb299cdba09f46f090b843d78ba26b667d50a456
https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5
https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4
https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409
https://www.zerodayinitiative.com/advisories/ZDI-24-1194/

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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.