CVE-2026-74557 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems should assess their exposure and apply patches as necessary. System administrators and security teams should verify kernel versions and monitor for potential indicators of exploitation.

Why it matters

This vulnerability allows for a stale-data leak into the SCSI sense buffer, potentially exposing sensitive information. Linux kernel developers, maintainers, and users should assess their exposure and apply patches as necessary.

• Sensitive information disclosure
• Potential data leakage through SCSI sense buffer
• Verification of kernel version and patch application required

Technical summary

The iscsi_scsi_cmd_rsp() function in the Linux kernel improperly handles sense data from target-supplied data segments. Specifically, it fails to account for a 2-byte sense length prefix, leading to a potential stale-data leak into the SCSI sense buffer. This issue can result in sensitive information being exposed to userspace. Affected Linux kernel developers and maintainers should assess their exposure and apply patches as necessary to prevent potential information disclosure. The vulnerability has a CVSS score of 7.5 and is considered HIGH severity.

Defensive priority

High

Recommended defensive actions

• Review and apply the provided patches to ensure the vulnerability is addressed
• Verify the Linux kernel version and update to a patched version if necessary
• Monitor system logs for potential indicators of exploitation
• Perform a thorough review of system configurations and asset inventory to identify potential exposure
• Implement compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions and retest remediated assets to ensure the vulnerability is fully resolved
• Review and update incident response plans to account for potential exploitation of this vulnerability

Evidence notes

The CVE record and associated source item provide details on the vulnerability, including its description, affected versions, and references to relevant commits. However, there is limited information on potential exploitation or real-world impact.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.