CVE-2026-74338 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel security, administrators, and developers using Linux kernel should assess exposure and prioritize verification of Linux kernel versions to determine if they are affected by this vulnerability.

Why it matters

The Linux kernel vulnerability in BPF_LSM_CGROUP programs requires verification of Linux kernel versions and potential application of patches or updates to prevent issues.

• Verify Linux kernel versions to determine exposure
• Assess and apply patches or updates from Linux
• Monitor for potential issues with BPF_LSM_CGROUP programs
• Review and update defensive configurations and controls

Technical summary

The Linux kernel has a vulnerability where sleepable BPF_LSM_CGROUP programs are not rejected at load time. This can lead to issues when such programs are attached to LSM cgroup. The vulnerability has been resolved by adding support to the verifier to explicitly reject attempts to load sleepable BPF programs destined for LSM cgroup attachment. Defenders should assess exposure and prioritize verification of Linux kernel versions to determine if they are affected by this vulnerability. Verification involves checking Linux kernel configurations and BPF_LSM_CGROUP program usage. Additionally, defenders should review and apply patches or updates from Linux, monitor for potential issues with BPF_LSM_CGROUP programs,

Defensive priority

Defenders should assess exposure and prioritize verification of Linux kernel versions to determine if they are affected by this vulnerability.

Recommended defensive actions

• Assess exposure by verifying Linux kernel versions
• Prioritize verification of affected versions
• Review and apply patches or updates from Linux
• Verify Linux kernel configurations and BPF_LSM_CGROUP program usage
• Monitor for potential issues with BPF_LSM_CGROUP programs
• Review and update defensive configurations and controls
• Track and document verification and remediation efforts

Evidence notes

The CVE record and source item provide details about the vulnerability and its resolution in the Linux kernel. However, the corpus does not establish specific versions that are affected or fixed, requiring verification from the supplied official sources.

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.