#VU103014 Out-of-bounds read in Linux kernel - CVE-2025-21647

Vulnerability identifier: #VU103014

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-2025-21647

CWE-ID: CWE-125

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 an out-of-bounds read error within the cake_ddst(), cake_enqueue() and cake_dequeue() functions in net/sched/sch_cake.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

---

External links
https://git.kernel.org/stable/c/27202e2e8721c3b23831563c36ed5ac7818641ba
https://git.kernel.org/stable/c/737d4d91d35b5f7fa5bb442651472277318b0bfd
https://git.kernel.org/stable/c/91bb18950b88f955838ec0c1d97f74d135756dc7
https://git.kernel.org/stable/c/a777e06dfc72bed73c05dcb437d7c27ad5f90f3f

---

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.