CVE-2024-36934: bna: ensure the copied buf is NUL terminated

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-30 · updated 2026-10-15
Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: bna: ensure the copied buf is NUL terminated Currently, we allocate a nbytes-sized kernel buffer and copy nbytes from userspace to that buffer. Later, we use sscanf on this buffer but we don't ensure that the string is terminated inside the buffer, this can lead to OOB read when using sscanf. Fix this issue by using memdup_user_nul instead of memdup_user.

Affected products

Debian Linux: 10.0
Linux kernel: from 3.3 before 4.19.314; from 4.20 before 5.4.276; from 5.5 before 5.10.217; from 5.11 before 5.15.159; from 5.16 before 6.1.91; from 6.2 before 6.6.31 — fixed in 4.19.314, 5.10.217, 5.15.159, 5.4.276, 6.1.91, 6.6.31

How to fix

Upgrade to a fixed version: Linux kernel 4.19.314, 5.10.217, 5.15.159, 5.4.276. Check the vendor advisory for mitigations.

References

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