CVE-2021-47485: IB/qib: Protect from buffer overflow in struct qib_user_sdma_pkt fields

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: 2024-05-22 · updated 2026-08-04
Weakness: CWE-120

Description

In the Linux kernel, the following vulnerability has been resolved: IB/qib: Protect from buffer overflow in struct qib_user_sdma_pkt fields Overflowing either addrlimit or bytes_togo can allow userspace to trigger a buffer overflow of kernel memory. Check for overflows in all the places doing math on user controlled buffers.

Affected products

Linux kernel: from 2.6.35 before 4.4.292; from 4.5 before 4.9.290; from 4.10 before 4.14.255; from 4.15 before 4.19.216; from 4.20 before 5.4.157; from 5.5 before 5.10.77 — fixed in 4.14.255, 4.19.216, 4.4.292, 4.9.290, 5.10.77, 5.14.16

How to fix

Upgrade to a fixed version: Linux kernel 4.14.255, 4.19.216, 4.4.292, 4.9.290. Check the vendor advisory for mitigations.

References

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