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CVE-2026-31442: dmaengine: idxd: Fix possible invalid memory access after FLR

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-22 · updated 2026-10-19
• Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Fix possible invalid memory access after FLR In the case that the first Function Level Reset (FLR) concludes correctly, but in the second FLR the scratch area for the saved configuration cannot be allocated, it's possible for a invalid memory access to happen. Always set the deallocated scratch area to NULL after FLR completes.

Affected products

• Linux kernel: from 6.14 before 6.18.21; from 6.19 before 6.19.11; 7.0-rc1, 7.0-rc2, 7.0-rc3, 7.0-rc4, 7.0-rc5 — fixed in 6.18.21, 6.19.11

How to fix

Upgrade to a fixed version: Linux kernel 6.18.21, 6.19.11. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/504c0e6751001ac46917c73e703f2b1b92cfc026
• https://git.kernel.org/stable/c/867d0c801f21370d561420fa32f2ea1a7dc3a22d
• https://git.kernel.org/stable/c/d6077df7b75d26e4edf98983836c05d00ebabd8d

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