#VU93787 Improper locking in Linux kernel - CVE-2024-26773

Vulnerability identifier: #VU93787

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-26773

CWE-ID: CWE-667

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 perform a denial of service (DoS) attack.

The vulnerability exists due to improper locking within the ext4_mb_try_best_found() function in fs/ext4/mballoc.c. A local user can perform a denial of service (DoS) attack.

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/21f8cfe79f776287459343e9cfa6055af61328ea
https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d
https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03
https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5
https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36
https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1
https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe
https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53
https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html

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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.