Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: xilinx: axienet: Fix BQL accounting for multi-BD TX packets When a TX packet spans multiple buffer descriptors (scatter-gather), axienet_free_tx_chain sums the per-BD actual length from descriptor status into a caller-provided accumulator. That sum is reset on each NAPI poll. If the BDs for a single packet complete across different polls, the earlier bytes are lost and never credited to BQL. This causes BQL to think bytes are permanently in-flight, eventually stalling the TX queue. The SKB pointer is stored only on the last BD of a packet. When that BD completes, use skb->len for the byte count instead of summing per-BD status lengths. This matches netdev_sent_queue(), which debits skb->len, and naturally survives across polls because no partial packet contributes to the accumulator.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.15, < 6.18.22 |
References
- https://git.kernel.org/stable/c/2a0323a913109b52bfc9f5ea7b92a1b249e07d3ePatch
- https://git.kernel.org/stable/c/3c3a6b9020c01fde7b22e8550105de0b59904f61Patch
- https://git.kernel.org/stable/c/d1978d03e86785872871bff9c2623174b10740dePatch
FAQ
What is CVE-2026-43031?
CVE-2026-43031 is a vulnerability with a CVSS score of 7.5 (HIGH). In the Linux kernel, the following vulnerability has been resolved: net: xilinx: axienet: Fix BQL accounting for multi-BD TX packets When a TX packet spans multiple buffer descriptors (scatter-gathe...
How severe is CVE-2026-43031?
CVE-2026-43031 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43031?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.