In the Linux kernel, the following vulnerability has been resolved: net: prestera: validate firmware header length prestera_fw_hdr_parse() reads the… (CVE-2026-74693)
A vulnerability in the Linux kernel's prestera driver was resolved by adding validation for the firmware header length. The function prestera_fw_hdr_parse() previously read the firmware header without verifying that the firmware image was long enough to contain it. This could lead to improper handling of malformed firmware images. The fix rejects images shorter than the expected header size before decoding critical fields.
AI Analysis
Technical Summary
The Linux kernel's prestera driver had a vulnerability where the prestera_fw_hdr_parse() function read the firmware header before confirming the firmware image contained a complete header structure. This lack of validation could cause out-of-bounds reads or improper processing. The vulnerability was addressed by adding a check to reject firmware images shorter than the size of struct prestera_fw_header prior to decoding the magic and version fields, preventing potential memory safety issues.
Potential Impact
The vulnerability could allow a malformed firmware image to cause out-of-bounds reads in kernel memory during header parsing. This may lead to kernel instability or other unintended behavior. No known exploits in the wild have been reported. The impact is limited to the prestera driver firmware parsing component.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to validate the firmware header length before parsing. Users should update to a Linux kernel version that includes this patch. Since no patch links or specific fixed versions are provided, check the official Linux kernel advisories or repositories for the relevant commit or release containing this fix.
In the Linux kernel, the following vulnerability has been resolved: net: prestera: validate firmware header length prestera_fw_hdr_parse() reads the… (CVE-2026-74693)
Description
A vulnerability in the Linux kernel's prestera driver was resolved by adding validation for the firmware header length. The function prestera_fw_hdr_parse() previously read the firmware header without verifying that the firmware image was long enough to contain it. This could lead to improper handling of malformed firmware images. The fix rejects images shorter than the expected header size before decoding critical fields.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's prestera driver had a vulnerability where the prestera_fw_hdr_parse() function read the firmware header before confirming the firmware image contained a complete header structure. This lack of validation could cause out-of-bounds reads or improper processing. The vulnerability was addressed by adding a check to reject firmware images shorter than the size of struct prestera_fw_header prior to decoding the magic and version fields, preventing potential memory safety issues.
Potential Impact
The vulnerability could allow a malformed firmware image to cause out-of-bounds reads in kernel memory during header parsing. This may lead to kernel instability or other unintended behavior. No known exploits in the wild have been reported. The impact is limited to the prestera driver firmware parsing component.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to validate the firmware header length before parsing. Users should update to a Linux kernel version that includes this patch. Since no patch links or specific fixed versions are provided, check the official Linux kernel advisories or repositories for the relevant commit or release containing this fix.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-2mgx-rhg3-xxxf
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-74693"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a8a27f1acd9273b499bc784
Added to database: 08/22/2026, 22:51:29 UTC
Last enriched: 08/23/2026, 00:10:40 UTC
Last updated: 08/23/2026, 01:32:07 UTC
Views: 3
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