Out-of-bounds write in Linux kernel - CVE-2020-12659

Vulnerability identifier: #VU28166

CSH Severity: Low

CVSS v4: 8.5 [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]

CVE-ID: CVE-2020-12659

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Linux kernel
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
kernel (Red Hat package)

Install updates from vendor's website.

Linux kernel - update to 5.6.7
kernel (Red Hat package) - update to 4.18.0-240.el8

• 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

• Out-of-bounds write in Linux kernel
• Red Hat Enterprise Linux 8 update for kernel