What’s Vulnerable › Vulnerabilities

CVE-2021-46917: dmaengine: idxd: fix wq cleanup of WQCFG registers

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-27 · updated 2026-06-17
• Weakness: CWE-668

Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix wq cleanup of WQCFG registers A pre-release silicon erratum workaround where wq reset does not clear WQCFG registers was leaked into upstream code. Use wq reset command instead of blasting the MMIO region. This also address an issue where we clobber registers in future devices.

Affected products

• Linux kernel: from 5.8.0 before 5.10.32; from 5.11.0 before 5.11.16 — fixed in 5.10.32, 5.11.16

How to fix

Upgrade to a fixed version: Linux kernel 5.10.32, 5.11.16. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/e5eb9757fe4c2392e069246ae78badc573af1833
• https://git.kernel.org/stable/c/ea9aadc06a9f10ad20a90edc0a484f1147d88a7a
• https://git.kernel.org/stable/c/f7dc8f5619165e1fa3383d0c2519f502d9e2a1a9
• https://git.kernel.org/stable/c/e5eb9757fe4c2392e069246ae78badc573af1833
• https://git.kernel.org/stable/c/ea9aadc06a9f10ad20a90edc0a484f1147d88a7a
• https://git.kernel.org/stable/c/f7dc8f5619165e1fa3383d0c2519f502d9e2a1a9

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