Buffer overflow in Linux kernel - CVE-2021-3635

Vulnerability identifier: #VU64185

CSH Severity: Low

CVSS v4: 6.8 [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]

CVE-ID: CVE-2021-3635

CWE-ID: CWE-119

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to a boundary error in the Linux kernel netfilter implementation. A local user with root (CAP_SYS_ADMIN) access can panic the system when issuing netfilter netflow commands.

Linux kernel
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
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)
kernel-rt (Red Hat package)
IBM Spectrum Protect Plus
Pixel

Install updates from vendor's website.

Linux kernel - update to 5.5 rc7
kernel (Red Hat package) - update to 4.18.0-348.el8
kernel-rt (Red Hat package) - update to 4.18.0-348.rt7.130.el8
IBM Spectrum Protect Plus - update to 10.1.11
Pixel - update to 12L 2022-06-05

• https://bugzilla.redhat.com/show_bug.cgi?id=1976946

• Multiple vulnerabilities in Google Pixel
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel
• Multiple vulnerabilities in IBM Spectrum Protect Plus