CVE-2026-90416
RDMA/mlx5: Fix stack out-of-bounds read in cc_params debugfs
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.
INFO
Published Date :
Sept. 17, 2026, 5:17 p.m.
Last Modified :
Sept. 17, 2026, 5:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Size buffer for widest unsigned decimal.
- Format parameter with " %u".
- Use scnprintf() for accurate length.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-90416.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-90416 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-90416
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-90416 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-90416 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 17, 2026
Action Type Old Value New Value Added 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. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/90xxx/CVE-2026-90416.json">CVE-2026-90416</a> Added Reference https://git.kernel.org/stable/c/03826bc1fa6c90405bf05831f2b501a8368dcd27 Added Reference https://git.kernel.org/stable/c/06b62758f81e27ca4c81201c22e3436c6d9ac894 Added Reference https://git.kernel.org/stable/c/0b0122fcc923a0271130f5fb71af2cd7e20434d9 Added Reference https://git.kernel.org/stable/c/1c5b4f76cd73372c5a8a4c91c95d5a31f141e091 Added Reference https://git.kernel.org/stable/c/4599311e78e88c893ad551aca622de2bfdf1c31f Added Reference https://git.kernel.org/stable/c/c75ee076fa09778a2f9602a972dade4a0b0785f7 Added Reference https://git.kernel.org/stable/c/ce8dfd32a33b578c3abf178f67b4c8d36854f041 Added Reference https://git.kernel.org/stable/c/d809cf3f0ed9255abfc73c4730bcf187151422af