CVE-2026-80629 Linux CVE debrief

Who should care

Linux kernel developers and administrators should verify the Linux kernel version and apply patches if available to prevent potential exploitation. The vulnerability can cause a slab-out-of-bounds write, which can lead to potential security risks. Linux kernel developers and administrators should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Why it matters

CVE-2026-80629 is a Linux kernel vulnerability in the octeontx2-af: npc component that can cause a slab-out-of-bounds write. Linux kernel developers and administrators should verify the Linux kernel version and apply patches if available to prevent potential exploitation.

• Verify Linux kernel version and apply patch if available to prevent potential slab-out-of-bounds write
• Monitor system for suspicious activity to detect potential exploitation attempts

Technical summary

The Linux kernel has a vulnerability in the octeontx2-af: npc component, which can cause a slab-out-of-bounds write. The vulnerability was reported in the Linux kernel and has been resolved. The fix involves allocating counter for reserved mcam entry for cpt 2nd pass entry. However, mcam->entry2cntr_map is not allocated for reserved entries. This can cause a slab-out-of-bounds write. Linux kernel developers and administrators should verify the Linux kernel version and apply patches if available to prevent potential exploitation.

Defensive priority

Verify Linux kernel version and apply patch if available

Recommended defensive actions

• Verify Linux kernel version
• Apply patch if available
• Monitor system for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• 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

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but its scope and impact require further verification. The vulnerability was reported in the Linux kernel and has been resolved. The fix involves allocating counter for reserved mcam entry for cpt 2nd pass entry. However, mcam->entry2cntr_map is not allocated for reserved entries. This can cause a slab-out-of-bounds write. Linux kernel developers and administrators should verify the Linux kernel version and apply patches if available to prevent potential exploitation.

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.