#VU89972 Memory leak in Linux kernel - CVE-2021-47426

Vulnerability identifier: #VU89972

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-2021-47426

CWE-ID: CWE-401

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 memory leak within the bpf_int_jit_compile() function in arch/s390/net/bpf_jit_comp.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/a326f9c01cfbee4450ae49ce618ae6cbc0f76842
https://git.kernel.org/stable/c/29fdb11ca88d3c490a3d56f0dc77eb9444d086be
https://git.kernel.org/stable/c/d590a410e472417a22336c7c37685bfb38e801f2
https://git.kernel.org/stable/c/686cb8b9f6b46787f035afe8fbd132a74e6b1bdd

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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.