eth: fbnic: ring the doorbell if a burst ends in a drop

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Summary

CVECVE-2026-98277
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 09:18:17 UTC
Updated2026-10-06 09:18:17 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: eth: fbnic: ring the doorbell if a burst ends in a drop fbnic_tx_map() skips the doorbell write, and the completion request, for every packet handed to it with xmit_more set, counting on the packet which ends the burst to publish them all. When that packet is dropped instead - skb_put_padto(), skb_cow_head() or a DMA mapping failure - nothing rings. The descriptors of the preceding packets stay invisible to the HW until the next transmit on that queue, which for a burst-then-idle workload may never come. Remember the meta descriptor of the last packet left without a doorbell and flush it from the error paths. The completion request has to be set on that descriptor rather than simply writing the tail, otherwise the HW would transmit the packets but never report a head, and the ring would fill up and stall for good. This is very similar to Joe's recent series of fixes for bnxt. Not seen in real life, reproduced under QEMU with failure injection.

Risk And Classification

EPSS: 0.001860000 probability, percentile 0.075210000 (date 2026-10-06)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9a57bacd574b52b08bc2c600af6a8c7a87049ecf 60ef74357a36ed2a102a75bb68d37aa7f305b94e git Not specified
CNA Linux Linux affected 9a57bacd574b52b08bc2c600af6a8c7a87049ecf 28fb764d670aa22dcbd2a02fd8fd87ae8d3563a9 git Not specified
CNA Linux Linux affected 9a57bacd574b52b08bc2c600af6a8c7a87049ecf 490599ab23134962a6d18a024e84541d77bdb999 git Not specified
CNA Linux Linux affected 6.11 Not specified
CNA Linux Linux unaffected 6.11 semver Not specified
CNA Linux Linux unaffected 6.18.54 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.8 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/490599ab23134962a6d18a024e84541d77bdb999 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/60ef74357a36ed2a102a75bb68d37aa7f305b94e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/28fb764d670aa22dcbd2a02fd8fd87ae8d3563a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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