CVE-2026-90416

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.

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EPSS — Exploit Prediction

0.0021

Probability of exploitation

0.11%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other 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

Frequently Asked Questions

What is CVE-2026-90416? +

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.

How do I check if I'm vulnerable to CVE-2026-90416? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.