#VU106109 Use-after-free in Linux kernel - CVE-2025-21883

Vulnerability identifier: #VU106109

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-2025-21883

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 ice_initialize_vf_entry() function in drivers/net/ethernet/intel/ice/ice_vf_lib.c, within the ice_free_vf_entries() and ice_free_vfs() functions in drivers/net/ethernet/intel/ice/ice_sriov.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/34393fd78d7183a007eaf0090966ebedcc29bd57
https://git.kernel.org/stable/c/3c01102bec9592928e6b155da41cfcd5d25a2066
https://git.kernel.org/stable/c/79990cf5e7aded76d0c092c9f5ed31eb1c75e02c
https://git.kernel.org/stable/c/a4880583f88deba63504ce1c8287a70d39c01378

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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.