Integer underflow in Linux kernel mm
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2025-21860 |
| CWE-ID | CWE-191 |
| Exploitation vector | Local |
| Public exploit | N/A |
| Vulnerable software |
Linux kernel Operating systems & Components / Operating system |
| Vendor | Linux Foundation |
Security Bulletin
This security bulletin contains one low risk vulnerability.
1) Integer underflow
EUVDB-ID: #VU105673
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-2025-21860
CWE-ID:
CWE-191 - Integer underflow
Exploit availability: No
DescriptionThe vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to integer underflow within the zswap_store_page() and zswap_store() functions in mm/zswap.c. A local user can execute arbitrary code.
MitigationInstall update from vendor's website.
Vulnerable software versionsLinux kernel: All versions
CPE2.3 External linkshttps://git.kernel.org/stable/c/63895d20d63b446f5049a963983489319c2ea3e2
https://git.kernel.org/stable/c/a3652f5552b20903315612da487a7be2b95394d5
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.
