#VU103581 Use-after-free in Linux kernel - CVE-2025-21676

Vulnerability identifier: #VU103581

Vulnerability risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:U/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-21676

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 fec_enet_tx() and fec_enet_rx_queue() functions in drivers/net/ethernet/freescale/fec_main.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/001ba0902046cb6c352494df610718c0763e77a5
https://git.kernel.org/stable/c/1425cb829556398f594658512d49292f988a2ab0
https://git.kernel.org/stable/c/8a0097db0544b658c159ac787319737712063a23

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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.