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.
How to fix
- Linux Linux1c5b4f76cd73372c5a8a4c91c95d5a31f141e091, 06b62758f81e27ca4c81201c22e3436c6d9ac894, d809cf3f0ed9255abfc73c4730bcf187151422af, 0b0122fcc923a0271130f5fb71af2cd7e20434d9, ce8dfd32a33b578c3abf178f67b4c8d36854f041, 4599311e78e88c893ad551aca622de2bfdf1c31f, c75ee076fa09778a2f9602a972dade4a0b0785f7, 03826bc1fa6c90405bf05831f2b501a8368dcd27 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 ≤ v < 1c5b4f76cd73372c5a8a4c91c95d5a31f141e091, 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 ≤ v < 06b62758f81e27ca4c81201c22e3436c6d9ac894, 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 ≤ v < d809cf3f0ed9255abfc73c4730bcf187151422af, 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 ≤ v < 0b0122fcc923a0271130f5fb71af2cd7e20434d9, 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 ≤ v < ce8dfd32a33b578c3abf178f67b4c8d36854f041, 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 ≤ v < 4599311e78e88c893ad551aca622de2bfdf1c31f, 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 ≤ v < c75ee076fa09778a2f9602a972dade4a0b0785f7, 4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 ≤ v < 03826bc1fa6c90405bf05831f2b501a8368dcd27, 4.14 | 1c5b4f76cd73372c5a8a4c91c95d5a31f141e091, 06b62758f81e27ca4c81201c22e3436c6d9ac894, d809cf3f0ed9255abfc73c4730bcf187151422af, 0b0122fcc923a0271130f5fb71af2cd7e20434d9, ce8dfd32a33b578c3abf178f67b4c8d36854f041, 4599311e78e88c893ad551aca622de2bfdf1c31f, c75ee076fa09778a2f9602a972dade4a0b0785f7, 03826bc1fa6c90405bf05831f2b501a8368dcd27 |
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