#VU104989 Out-of-bounds read in Linux kernel - CVE-2025-21724

Vulnerability identifier: #VU104989

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-2025-21724

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 iova_bitmap_offset_to_index() function in drivers/vfio/iova_bitmap.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/38ac76fc06bc6826a3e4b12a98efbe98432380a9
https://git.kernel.org/stable/c/44d9c94b7a3f29a3e07c4753603a35e9b28842a3
https://git.kernel.org/stable/c/b1f8453b8ff1ab79a03820ef608256c499769cb6
https://git.kernel.org/stable/c/d5d33f01b86af44b23eea61ee309e4ef22c0cdfe
https://git.kernel.org/stable/c/e24c1551059268b37f6f40639883eafb281b8b9c

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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.