#VU90243 Use-after-free in Linux kernel - CVE-2021-47063

Vulnerability identifier: #VU90243

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-2021-47063

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 panel_bridge_attach() function in drivers/gpu/drm/bridge/panel.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/ce450934a00cf896e648fde08d0bd1426653d7a2
https://git.kernel.org/stable/c/18149b420c9bd93c443e8d1f48a063d71d9f6aa1
https://git.kernel.org/stable/c/98d7d76a74e48ec3ddf2e23950adff7edcab9327
https://git.kernel.org/stable/c/4d906839d321c2efbf3fed4bc31ffd9ff55b75c0

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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.