What’s Vulnerable › Vulnerabilities

CVE-2021-47003: dmaengine: idxd: Fix potential null dereference on pointer status

• 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: 2024-02-28 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Fix potential null dereference on pointer status There are calls to idxd_cmd_exec that pass a null status pointer however a recent commit has added an assignment to *status that can end up with a null pointer dereference. The function expects a null status pointer sometimes as there is a later assignment to *status where status is first null checked. Fix the issue by null checking status before making the assignment. Addresses-Coverity: ("Explicit null dereferenced")

Affected products

• Linux kernel: from 5.10.17 before 5.10.38; from 5.11 before 5.11.22; from 5.12 before 5.12.5 — fixed in 5.10.38, 5.11.22, 5.12.5

How to fix

Upgrade to a fixed version: Linux kernel 5.10.38, 5.11.22, 5.12.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2280b4cc29d8cdd2be3d1b2d1ea4f958e2131c97
• https://git.kernel.org/stable/c/28ac8e03c43dfc6a703aa420d18222540b801120
• https://git.kernel.org/stable/c/5756f757c72501ef1a16f5f63f940623044180e9
• https://git.kernel.org/stable/c/7bc402f843e7817a4a808e7b9ab0bcd7ffd55bfa
• https://git.kernel.org/stable/c/2280b4cc29d8cdd2be3d1b2d1ea4f958e2131c97
• https://git.kernel.org/stable/c/28ac8e03c43dfc6a703aa420d18222540b801120
• https://git.kernel.org/stable/c/5756f757c72501ef1a16f5f63f940623044180e9
• https://git.kernel.org/stable/c/7bc402f843e7817a4a808e7b9ab0bcd7ffd55bfa

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