What’s Vulnerable › Vulnerabilities

CVE-2021-47286: bus: mhi: core: Validate channel ID when processing command completions

• Severity: high (CVSS 7.8 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: 2024-05-21 · updated 2026-06-17
• Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: bus: mhi: core: Validate channel ID when processing command completions MHI reads the channel ID from the event ring element sent by the device which can be any value between 0 and 255. In order to prevent any out of bound accesses, add a check against the maximum number of channels supported by the controller and those channels not configured yet so as to skip processing of that event ring element.

Affected products

• Linux kernel: from 5.7 before 5.10.54; from 5.11 before 5.13.6; 5.14-rc1, 5.14-rc2 — fixed in 5.10.54, 5.13.6

How to fix

Upgrade to a fixed version: Linux kernel 5.10.54, 5.13.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3efec3b4b16fc7af25676a94230a8ab2a3bb867c
• https://git.kernel.org/stable/c/546362a9ef2ef40b57c6605f14e88ced507f8dd0
• https://git.kernel.org/stable/c/aed4f5b51aba41e2afd7cfda20a0571a6a67dfe9
• https://git.kernel.org/stable/c/3efec3b4b16fc7af25676a94230a8ab2a3bb867c
• https://git.kernel.org/stable/c/546362a9ef2ef40b57c6605f14e88ced507f8dd0
• https://git.kernel.org/stable/c/aed4f5b51aba41e2afd7cfda20a0571a6a67dfe9

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