CVE-2026-74336 Linux CVE debrief

Who should care

Linux kernel maintainers, administrators of systems using the Linux kernel, and security teams responsible for vulnerability management should verify Linux kernel versions to assess exposure, prioritize patching for systems handling S1G TIM elements, and review system configurations and inventory for potential impact. These stakeholders should also consider the potential operational impacts, including verifying system configurations, reviewing monitoring,

Why it matters

A vulnerability in the Linux kernel's mac80211 component has been addressed, where the S1G TIM PVB walk was not properly bounded to the TIM element, potentially allowing for out-of-bounds reads of adjacent data. Linux kernel maintainers, administrators of systems using the Linux kernel, and security teams responsible for vulnerability management should verify Linux kernel versions to assess exposure, prioritize patching for systems handling S1G TIM elements, and review system configurations and inventory for potential impact.

• Verify Linux kernel versions to assess exposure
• Prioritize patching for systems handling S1G TIM elements
• Review system configurations and inventory for potential impact

Technical summary

The ieee80211_s1g_check_tim() function in the Linux kernel's mac80211 component did not properly bound the S1G TIM PVB walk to the TIM element, potentially allowing for out-of-bounds reads of adjacent data. This has been resolved with a patch. The vulnerability affects systems using the Linux kernel, particularly those handling S1G TIM elements. Linux kernel maintainers, administrators of systems using the Linux kernel, and security teams should verify Linux kernel versions to assess exposure and prioritize patching.

Defensive priority

Verify Linux kernel versions and assess exposure; prioritize patching for systems handling S1G TIM elements.

Recommended defensive actions

• Verify Linux kernel versions and assess exposure
• Prioritize patching for systems handling S1G TIM elements
• Review system configurations and inventory for potential impact
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but no additional information on exploitation or impact is available. The vulnerability has been resolved in the Linux kernel, and users should verify their kernel versions to assess exposure. The S1G TIM PVB walk issue could potentially allow for out-of-bounds reads of adjacent data, but there is no evidence of exploitation. Defenders should verify Linux kernel versions and assess exposure, prioritize patching for systems handling S1G TIM elements, and review system

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.