CVE-2021-46920 dmaengine: idxd: Fix clobbering of SWERR overflow bit on writeback

What is CVE-2021-46920?

CVE-2021-46920 is a medium-severity vulnerability in Linux kernel, published on 27 Feb 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

dmaengine: idxd: Fix clobbering of SWERR overflow bit on writeback

Current code blindly writes over the SWERR and the OVERFLOW bits. Write back the bits actually read instead so the driver avoids clobbering the OVERFLOW bit that comes after the register is read.

Which versions are affected by CVE-2021-46920?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-46920?

Apply the vendor's patch.

Is CVE-2021-46920 being exploited?

There is no known exploitation of CVE-2021-46920 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-46920, GHSA-p23g-c2fc-p76q, UBUNTU-CVE-2021-46920.