CVE-2026-90416

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 < 1c5b4f76cd73372c5a8a4c91c95d5a31f141e091affected
LinuxLinux4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 < 06b62758f81e27ca4c81201c22e3436c6d9ac894affected
LinuxLinux4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 < d809cf3f0ed9255abfc73c4730bcf187151422afaffected
LinuxLinux4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 < 0b0122fcc923a0271130f5fb71af2cd7e20434d9affected
LinuxLinux4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 < ce8dfd32a33b578c3abf178f67b4c8d36854f041affected
LinuxLinux4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 < 4599311e78e88c893ad551aca622de2bfdf1c31faffected
LinuxLinux4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 < c75ee076fa09778a2f9602a972dade4a0b0785f7affected
LinuxLinux4a2da0b8c0782816f3ae6846ae7942fcbb0f8172 < 03826bc1fa6c90405bf05831f2b501a8368dcd27affected
LinuxLinux4.14affected
LinuxLinux0 < 4.14unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References