Out-of-bounds write in Linux kernel

1) Out-of-bounds write

EUVDB-ID: #VU28166

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-12659

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input in "xdp_umem_reg" in "net/xdp/xdp_umem.c" file. A local user can trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.6 - 5.6.6

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.6.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.6.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.6.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.6.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.6.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.6.6:*:*:*:*:*:*:*

External links

https://bugzilla.kernel.org/show_bug.cgi?id=207225
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.7
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=99e3a236dd43d06c65af0a2ef9cb44306aef6e02
https://github.com/torvalds/linux/commit/99e3a236dd43d06c65af0a2ef9cb44306aef6e02

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.