#VU104962 Use-after-free in Linux kernel - CVE-2025-21722

Vulnerability identifier: #VU104962

Vulnerability 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-2025-21722

CWE-ID: CWE-416

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 escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the nilfs_clear_dirty_pages() and nilfs_clear_folio_dirty() functions in fs/nilfs2/page.c. A local user can escalate privileges on the system.

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/1098bb8d52419d262a3358d099a1598a920b730f
https://git.kernel.org/stable/c/19296737024cd220a1d6590bf4c092bca8c99497
https://git.kernel.org/stable/c/557ccf5e49f1fb848a29698585bcab2e50a597ef
https://git.kernel.org/stable/c/ca76bb226bf47ff04c782cacbd299f12ddee1ec1

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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.