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.

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