#VU92411 Out-of-bounds write in Linux kernel - CVE-2021-42327

Vulnerability identifier: #VU92411

Vulnerability risk: Low

CVSSv4.0: 7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2021-42327

CWE-ID: CWE-787

Exploitation vector: Local

Exploit availability: Yes

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local privileged user to execute arbitrary code.

The vulnerability exists due to out-of-bounds write error. A local privileged user can execute arbitrary code.

Mitigation
Install update from vendor's repository.

Vulnerable software versions

Linux kernel: All versions

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External links
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
https://security.netapp.com/advisory/ntap-20211118-0005/
https://www.mail-archive.com/amd-gfx%40lists.freedesktop.org/msg69080.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RDDEW4APTYKJK365HC2JZIVXYUV7ZRN7/
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f23750b5b3d98653b31d4469592935ef6364ad67

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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. However, proof of concept for this vulnerability is available.