Network interface outage via cleared TX event
Published Jan 13, 2026 · Updated Jan 13, 2026
Denial of service in Linux Kernel bnxt_en allows remote attackers to drop all traffic on an affected interface via sustained XDP_TX packets. In bnxt_rx_xdp(), a repeated XDP_TX action clears BNXT_TX_EVENT before confirming __bnxt_xmit_xdp() can queue another frame, so a full TX ring leaves descriptors pending without a doorbell. Exploitation requires a Broadcom bnxt_en interface with an XDP_TX program already active; RX refill then stops until the interface is reset or reconfigured.
Summary
What happened
Denial of service in Linux Kernel bnxt_en allows remote attackers to drop all traffic on an affected interface via sustained XDP_TX packets. In bnxt_rx_xdp(), a repeated XDP_TX action clears BNXT_TX_EVENT before confirming __bnxt_xmit_xdp() can queue another frame, so a full TX ring leaves descriptors pending without a doorbell. Exploitation requires a Broadcom bnxt_en interface with an XDP_TX program already active; RX refill then stops until the interface is reset or reconfigured.
The record
- CVE
- CVE-2025-68770
- Published
- Jan 13, 2026
- Updated
- Jan 13, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1498.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 13, 2026CVE publishedPublication date reported by the CVE source.
- Jan 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.8
- Affected versionversion=7f0a168b0441ef7fd6b46563efb2706c58ac2a4c <0373d5c387f24de749cc22e694a14b3a7c7eb515
- Affected versionversion=7f0a168b0441ef7fd6b46563efb2706c58ac2a4c <4b83902a1e67ff327ab5c6c65021a03e72c081d6
- Affected versionversion=7f0a168b0441ef7fd6b46563efb2706c58ac2a4c <f17e0c1208485b24d61271bc1ddc8f2087e71561
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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