Improper locking in Linux kernel sched

1) Improper locking

EUVDB-ID: #VU107732

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-2025-38637

CWE-ID: CWE-667 - Improper Locking

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper locking within the skbprio_enqueue() and skbprio_dequeue() functions in net/sched/sch_skbprio.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

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:*:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/034b293bf17c124fec0f0e663f81203b00aa7a50
https://git.kernel.org/stable/c/1284733bab736e598341f1d3f3b94e2a322864a8
https://git.kernel.org/stable/c/1dcc144c322a8d526b791135604c0663f1af9d85
https://git.kernel.org/stable/c/2286770b07cb5268c03d11274b8efd43dff0d380
https://git.kernel.org/stable/c/2f35b7673a3aa3d09b3eb05811669622ebaa98ca
https://git.kernel.org/stable/c/32ee79682315e6d3c99947b3f38b078a09a66919
https://git.kernel.org/stable/c/7abc8318ce0712182bf0783dcfdd9a6a8331160e
https://git.kernel.org/stable/c/864ca690ff135078d374bd565b9872f161c614bc
https://git.kernel.org/stable/c/ce8fe975fd99b49c29c42e50f2441ba53112b2e8

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.