CVE-2026-52905 Linux CVE debrief

Who should care

Linux kernel maintainers, users, and administrators of systems using DAMON should assess exposure and prioritize verification of affected systems, especially those using DAMON. Linux kernel versions 6.18 and 6.19 may be vulnerable. System configurations should be verified for DAMON usage.

Why it matters

A vulnerability in the Linux kernel's DAMON subsystem can allow unaligned DAMON region address ranges, potentially causing issues. Linux kernel maintainers and users should assess exposure and prioritize verification of affected systems.

• Verify if Linux kernel versions 6.18 and 6.19 are vulnerable
• Assess system configurations for DAMON usage
• Apply patches to prevent potential issues

Technical summary

The Linux kernel's DAMON subsystem has a vulnerability that allows unaligned region address ranges. A fix is provided to ensure that the minimum region size is a power of two on damon_start(). The vulnerability was introduced by a previous commit and was only partially fixed. Linux kernel maintainers and users should assess exposure and prioritize verification of affected systems, especially those using DAMON. No additional information is available about the vulnerability beyond what is provided in the CVE record and the Linux kernel patches.

Defensive priority

Linux kernel maintainers and users should assess exposure and prioritize verification of affected systems, especially those using DAMON.

Recommended defensive actions

• Review Linux kernel versions 6.18 and 6.19 for exposure
• Verify system configurations for DAMON usage
• Apply patches provided by Linux kernel maintainers
• Track exceptions and retest remediated assets
• Check relevant monitoring, detection, and logs for exposed assets
• Review compensating controls for exposed systems
• Confirm whether affected product deployments exist in managed environments

Evidence notes

The issue was discovered by sashiko and reported via the Linux kernel mailing list. The fix is provided in the form of three patches. No additional information is available about the vulnerability beyond what is provided in the CVE record and the Linux kernel patches. Linux kernel maintainers and users should verify the patches and assess exposure.

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.