CVE-2021-37576 Memory corruption in n/a

High 7.8 Published 26 Jul 2021 Updated 4 Aug 2024

A memory corruption vulnerability in the Linux kernel's KVM RTAS handler allows guest users to corrupt host memory, potentially leading to code execution or privilege escalation.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2021-37576?

CVE-2021-37576 is a high-severity memory corruption vulnerability in Fedoraproject Fedora, published on 26 Jul 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

arch/powerpc/kvm/book3s_rtas.c in the Linux kernel through 5.13.5 on the powerpc platform allows KVM guest OS users to cause host OS memory corruption via rtas_args.nargs, aka CID-f62f3c20647e.

Weakness: CWE-787

Which versions are affected by CVE-2021-37576?

It affects 2 products.

Linux distribution packages (15)

`kpatch-patch-4_18_0-305` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-5.el8`
`kpatch-patch-4_18_0-305-debuginfo` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-5.el8`
`kpatch-patch-4_18_0-305-debugsource` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-5.el8`
`kpatch-patch-4_18_0-305_10_2` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-2.el8_4`
`kpatch-patch-4_18_0-305_10_2-debuginfo` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-2.el8_4`
`kpatch-patch-4_18_0-305_10_2-debugsource` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-2.el8_4`
`kpatch-patch-4_18_0-305_12_1` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-1.el8_4`
`kpatch-patch-4_18_0-305_12_1-debuginfo` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-1.el8_4`
`kpatch-patch-4_18_0-305_12_1-debugsource` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-1.el8_4`
`kpatch-patch-4_18_0-305_3_1` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-4.el8_4`
`kpatch-patch-4_18_0-305_3_1-debuginfo` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-4.el8_4`
`kpatch-patch-4_18_0-305_3_1-debugsource` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-4.el8_4`
`kpatch-patch-4_18_0-305_7_1` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-3.el8_4`
`kpatch-patch-4_18_0-305_7_1-debuginfo` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-3.el8_4`
`kpatch-patch-4_18_0-305_7_1-debugsource` Red Hat:enterprise_linux:8::baseos	All versions	`0:1-3.el8_4`

Products include Fedoraproject Fedora, Linux kernel.

How do I fix CVE-2021-37576?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-37576 being exploited?

There is no known exploitation of CVE-2021-37576 in the wild and no public exploit code.

All Fedoraproject Fedora vulnerabilities

Sources

Also known as AZL-6579, DEBIAN-CVE-2021-37576, GHSA-w5r9-h86g-qp9x, RHSA-2021:3436, UBUNTU-CVE-2021-37576.