Use-after-free in Linux kernel x86 kvm



| Updated: 2025-05-13
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-47262
CWE-ID CWE-416
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Use-after-free

EUVDB-ID: #VU93086

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-2021-47262

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

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 arch/x86/kvm/trace.h. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.4 - 5.13 rc5

CPE2.3 External links

https://git.kernel.org/stable/c/796d3bd4ac9316e70c181189318cd2bd98af34bc
https://git.kernel.org/stable/c/d046f724bbd725a24007b7e52b2d675249870888
https://git.kernel.org/stable/c/9fb088ce13bc3c59a51260207b487db3e556f275
https://git.kernel.org/stable/c/f31500b0d437a2464ca5972d8f5439e156b74960
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.44
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.11
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.126


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.



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