Transmit-queue stall via omitted doorbell write
Published Oct 6, 2026 · Updated Oct 6, 2026
A transmit-queue stall in Linux 6.11 interrupts outbound traffic when the final packet of a burst is dropped by the fbnic driver. In fbnic_tx_map(), packets marked xmit_more defer the hardware doorbell and completion request, but error paths fail to flush earlier descriptors when the expected final packet is discarded. The affected host must use the fbnic transmit path and encounter a final-packet drop; the flaw was reproduced under QEMU with injected DMA-mapping failure, with no attacker-controlled trigger documented.
Summary
What happened
A transmit-queue stall in Linux 6.11 interrupts outbound traffic when the final packet of a burst is dropped by the fbnic driver. In fbnic_tx_map(), packets marked xmit_more defer the hardware doorbell and completion request, but error paths fail to flush earlier descriptors when the expected final packet is discarded. The affected host must use the fbnic transmit path and encounter a final-packet drop; the flaw was reproduced under QEMU with injected DMA-mapping failure, with no attacker-controlled trigger documented.
The record
- CVE
- CVE-2026-98277
- Published
- Oct 6, 2026
- Updated
- Oct 6, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 6, 2026CVE publishedPublication date reported by the CVE source.
- Oct 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=6.11
- Affected versionversion=9a57bacd574b52b08bc2c600af6a8c7a87049ecf <28fb764d670aa22dcbd2a02fd8fd87ae8d3563a9
- Affected versionversion=9a57bacd574b52b08bc2c600af6a8c7a87049ecf <490599ab23134962a6d18a024e84541d77bdb999
- Affected versionversion=9a57bacd574b52b08bc2c600af6a8c7a87049ecf <60ef74357a36ed2a102a75bb68d37aa7f305b94e
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What is affected?
Published CVSS scores
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Attacks
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Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
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Public exploit references
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Technologies
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