#VU105037 Reachable assertion in Linux kernel - CVE-2025-21754

Vulnerability identifier: #VU105037

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-2025-21754

CWE-ID: CWE-617

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 reachable assertion within the btrfs_split_ordered_extent() function in fs/btrfs/ordered-data.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/0d85f5c2dd91df6b5da454406756f463ba923b69
https://git.kernel.org/stable/c/0ff88c2a742a7cbaa4d08507d864737d099b435a
https://git.kernel.org/stable/c/8ea8db4216d1029527ab4666f730650419451e32
https://git.kernel.org/stable/c/927b930f117bbae730a853c1dc43da8afe8380fa

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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.