Resource management error in Linux kernel sched

1) Resource management error

EUVDB-ID: #VU93189

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-2021-47387

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to resource management error within the sugov_tunables_free(), sugov_tunables_alloc(), sugov_init() and sugov_exit() functions in kernel/sched/cpufreq_schedutil.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.9 - 5.15 rc7

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:4.9:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.9.0:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.9.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.9.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.9.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.9.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.9.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.9.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.9.7:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.9.8:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/cb4a53ba37532c861a5f3f22803391018a41849a
https://git.kernel.org/stable/c/463c46705f321201090b69c4ad5da0cd2ce614c9
https://git.kernel.org/stable/c/30d57cf2c4116ca6d34ecd1cac94ad84f8bc446c
https://git.kernel.org/stable/c/67c98e023135ff81b8d52998a6fdb8ca0c518d82
https://git.kernel.org/stable/c/a7d4fc84404d45d72f4490417e8cc3efa4af93f1
https://git.kernel.org/stable/c/8d62aec52a8c5b1d25a2364b243fcc5098a2ede9
https://git.kernel.org/stable/c/e5c6b312ce3cc97e90ea159446e6bfa06645364d
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.249
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.209
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.285
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.71
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.10
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.151

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.