#VU93454 Improper locking in Linux kernel - CVE-2021-47354

Vulnerability identifier: #VU93454

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-47354

CWE-ID: CWE-667

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 perform a denial of service (DoS) attack.

The vulnerability exists due to improper locking within the drm_sched_entity_kill_jobs_cb() function in drivers/gpu/drm/scheduler/sched_entity.c. A local user can perform a denial of service (DoS) attack.

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/c32d0f0e164ffab2a56c7cf8e612584b4b740e2e
https://git.kernel.org/stable/c/0687411e2a8858262de2fc4a1d576016fd77292e
https://git.kernel.org/stable/c/a8e23e3c1ff9ec598ab1b3a941ace6045027781f
https://git.kernel.org/stable/c/50d7e03ad487cc45fc85164a299b945a41756ac0
https://git.kernel.org/stable/c/0b10ab80695d61422337ede6ff496552d8ace99d

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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.