Remote network hang via bnxt lock inversion
Published Aug 26, 2026 · Updated Aug 27, 2026
Deadlock in the Linux bnxt Ethernet driver in 6.15 through 7.1.9 allows remote attackers to interrupt host networking with crafted traffic. The affinity-notifier callback takes netdev_lock to restart a queue while IRQ-notifier teardown calls cancel_work_sync under the same lock, creating a lock inversion. Exploitation requires an active TPH-capable Broadcom NetXtreme interface undergoing TX-timeout recovery while irqbalance or CPU hotplug migrates MSI-X affinity; the resulting hang persists until the host is rebooted.
Summary
What happened
Deadlock in the Linux bnxt Ethernet driver in 6.15 through 7.1.9 allows remote attackers to interrupt host networking with crafted traffic. The affinity-notifier callback takes netdev_lock to restart a queue while IRQ-notifier teardown calls cancel_work_sync under the same lock, creating a lock inversion. Exploitation requires an active TPH-capable Broadcom NetXtreme interface undergoing TX-timeout recovery while irqbalance or CPU hotplug migrates MSI-X affinity; the resulting hang persists until the host is rebooted.
The record
- CVE
- CVE-2026-74745
- Published
- Aug 26, 2026
- Updated
- Aug 27, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-833, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 26, 2026CVE publishedPublication date reported by the CVE source.
- Aug 27, 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=6.15
- Affected versionversion=c214410c47d6ec3128143370747d9e388bab21d7 <51e96fa31f7e7eac2cba8f854e24d36600cc040b
- Affected versionversion=c214410c47d6ec3128143370747d9e388bab21d7 <8b1118fc5a5d2cdc21cc07b5106921ad4f77c544
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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