Memory leak in Linux kernel perf

1) Memory leak

EUVDB-ID: #VU89929

Risk: Low

CVSSv3.1: 4.8 [AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47543

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 fetch_kernel_version() function in tools/perf/util/util.c, within the report__browse_hists() function in tools/perf/builtin-report.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

CPE2.3

External links

http://git.kernel.org/stable/c/df5990db088d4c7fea9a2f9b8195a7859e1768c4
http://git.kernel.org/stable/c/ff061b5bda73c4f785b4703eeb0848fd99e5608a
http://git.kernel.org/stable/c/71e284dcebecb9fd204ff11097469cc547723ad1
http://git.kernel.org/stable/c/d9fc706108c15f8bc2d4ccccf8e50f74830fabd9

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.