#VU103015 Out-of-bounds read in Linux kernel - CVE-2025-21650

Vulnerability identifier: #VU103015

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-2025-21650

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 hclgevf_get_regs_len() and hclgevf_get_regs() functions in drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_regs.c, within the hclge_fetch_pf_reg() function in drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_regs.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.12, 6.12.1, 6.12.2, 6.12.3, 6.12.4, 6.12.5, 6.12.6, 6.12.7, 6.12.8, 6.12.9

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External links
https://git.kernel.org/stable/c/0575baa733fc4219f230aef22d5bc35d922f1e9a
https://git.kernel.org/stable/c/7997ddd46c54408bcba5e37fe18b4d832e45d4d4
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.10
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13

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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.