#VU105149 Improper locking in Linux kernel - CVE-2025-21823

Vulnerability identifier: #VU105149

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-2025-21823

CWE-ID: CWE-667

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 improper locking within the batadv_v_elp_start_timer(), batadv_v_elp_get_throughput(), batadv_v_elp_throughput_metric_update(), batadv_v_elp_wifi_neigh_probe() and batadv_v_elp_periodic_work() functions in net/batman-adv/bat_v_elp.c, within the batadv_v_hardif_neigh_init() function in net/batman-adv/bat_v.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/0fdc3c166ac17b26014313fa2b93696354511b24
https://git.kernel.org/stable/c/781a06fd265a8151f7601122d9c2e985663828ff
https://git.kernel.org/stable/c/8c8ecc98f5c65947b0070a24bac11e12e47cc65d
https://git.kernel.org/stable/c/a7aa2317285806640c844acd4cd2cd768e395264
https://git.kernel.org/stable/c/af264c2a9adc37f4bdf88ca7f3affa15d8c7de9e

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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.