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CVE-2026-90416: RDMA/mlx5: Fix stack out-of-bounds read in cc_params debugfs

• Severity: unknown
• 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: 2026-09-17 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix stack out-of-bounds read in cc_params debugfs get_param() reads a congestion parameter as a u32 but formats it with the signed "%d" into an 11-byte stack buffer. A value with bit 31 set, such as 0x80000000, renders as "-2147483648\n" whose full length is 12. snprintf() stores only 11 bytes yet returns 12, so simple_read_from_buffer() treats 12 bytes as valid and reads one byte past lbuf[]. Size the buffer for the widest unsigned decimal, format with "%u" to match the u32, and use scnprintf() so the length passed to simple_read_from_buffer() reflects the bytes actually stored.

Affected products

• Linux kernel: 4.14 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/03826bc1fa6c90405bf05831f2b501a8368dcd27
• https://git.kernel.org/stable/c/06b62758f81e27ca4c81201c22e3436c6d9ac894
• https://git.kernel.org/stable/c/0b0122fcc923a0271130f5fb71af2cd7e20434d9
• https://git.kernel.org/stable/c/1c5b4f76cd73372c5a8a4c91c95d5a31f141e091
• https://git.kernel.org/stable/c/4599311e78e88c893ad551aca622de2bfdf1c31f
• https://git.kernel.org/stable/c/c75ee076fa09778a2f9602a972dade4a0b0785f7
• https://git.kernel.org/stable/c/ce8dfd32a33b578c3abf178f67b4c8d36854f041
• https://git.kernel.org/stable/c/d809cf3f0ed9255abfc73c4730bcf187151422af

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