#VU105137 Out-of-bounds read in Linux kernel - CVE-2025-21815

Vulnerability identifier: #VU105137

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-2025-21815

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 isolate_freepages_block() function in mm/compaction.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.12, 6.12.1, 6.12.2, 6.12.3, 6.12.4, 6.12.5, 6.12.6, 6.12.7, 6.12.8, 6.12.9, 6.12.10, 6.12.11, 6.12.12, 6.12.13, 6.13, 6.13.1, 6.13.2

---

External links
https://git.kernel.org/stable/c/10b7d3eb535098ccd4c82a182a33655d8a0e5c88
https://git.kernel.org/stable/c/4491159774d973a9e2e998d25d8fbb20fada6dfa
https://git.kernel.org/stable/c/d1366e74342e75555af2648a2964deb2d5c92200
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.14
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.3
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14

---

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.