CVE-2026-43250 Linux CVE debrief

Who should care

Linux system administrators, security teams, and developers should assess exposure and apply patches for affected Linux kernel versions. Linux kernel versions 2.6.29 through 6.12.75, 6.13 through 6.18.16, and 6.19 through 6.19.6 are affected. Operators and security teams should prioritize verifying and applying patches to prevent potential memory corruption and ensure system stability.

Why it matters

CVE-2026-43250 is a high-severity vulnerability in the Linux kernel's ChipIdea UDC driver. Defenders should prioritize verifying and applying patches for affected Linux kernel versions to prevent potential memory corruption and ensure system stability.

• Verify Linux kernel versions and apply patches to prevent potential memory corruption
• Inventory Linux systems for affected kernel versions to prioritize patching
• Monitor Linux kernel updates for CVE-2026-43250 patches to ensure timely remediation

Technical summary

The ChipIdea UDC driver in the Linux kernel can encounter 'not page aligned sg buffer' errors when a USB device is reconnected after being disconnected during an active transfer. The _ep_nuke() function returns requests to the gadget layer without properly unmapping DMA buffers or cleaning up scatter-gather bounce buffers. The fix involves adding DMA unmapping and bounce buffer cleanup to _ep_nuke() to mirror the cleanup sequence in _hardware_dequeue().

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions 2.6.29 through 6.12.75, 6.13 through 6.18.16, and 6.19 through 6.19.6.

Recommended defensive actions

• Verify Linux kernel versions and apply patches for CVE-2026-43250
• Inventory Linux systems for affected kernel versions
• Monitor Linux kernel updates for CVE-2026-43250 patches
• 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, including its root cause, fix, and affected Linux kernel versions. The vulnerability affects Linux kernel versions 2.6.29 through 6.12.75, 6.13 through 6.18.16, and 6.19 through 6.19.6. Defenders should verify Linux kernel versions and apply patches to prevent potential memory corruption. The evidence is limited to public sources and may not be comprehensive. Additional verification tasks are recommended to ensure system stability.

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.