Memory leak in Linux kernel bpf

1) Memory leak

EUVDB-ID: #VU89968

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-2021-47417

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

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

The vulnerability exists due to memory leak within the strset__free() function in tools/lib/bpf/strset.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.14 - 5.15 rc7

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.14:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.14:rc1:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.14:rc2:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.14:rc3:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.14:rc4:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.14:rc7:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.14.0-49.el9:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.14.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.14.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.14.3:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/9e8e7504e09831c469b67d6dc11d9a72654bdb8c
https://git.kernel.org/stable/c/b0e875bac0fab3e7a7431c2eee36a8ccc0c712ac
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.12
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15

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.