VulnerabilityPublished 18 Oct 2026

CVE-2026-98574: Linux kernel · net: bcmgenet: stop Tx NAPI before disabling the queues

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f329d42423089904758f2685cda295de9bf99441 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f329d42423089904758f2685cda295de9bf99441, 63bcc2fee6419963e45e7c2cd698fa862409601d, 7e87508b5c4d81210d0a736ed01962e52f5c4c56

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to f329d42423089904758f2685cda295de9bf99441, 63bcc2fee6419963e45e7c2cd698fa862409601d or 7e87508b5c4d81210d0a736ed01962e52f5c4c56.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 254f3239dd070e469f45c3ca8b6ac38e47d6c730, < f329d42423089904758f2685cda295de9bf99441	Fixed in f329d42423089904758f2685cda295de9bf99441
LinuxLinux	Affected ≥ 254f3239dd070e469f45c3ca8b6ac38e47d6c730, < 63bcc2fee6419963e45e7c2cd698fa862409601d	Fixed in 63bcc2fee6419963e45e7c2cd698fa862409601d
LinuxLinux	Affected ≥ 254f3239dd070e469f45c3ca8b6ac38e47d6c730, < 7e87508b5c4d81210d0a736ed01962e52f5c4c56	Fixed in 7e87508b5c4d81210d0a736ed01962e52f5c4c56
LinuxLinux	Affected =6.15	Fixed in–

AI-suggested

The vulnerability is fixed in the Linux kernel by commits identified as f329d42423089904758f2685cda295de9bf99441, 63bcc2fee6419963e45e7c2cd698fa862409601d, and 7e87508b5c4d81210d0a736ed01962e52f5c4c56. Users should update to a Linux kernel version that includes these fixes. No other mitigation is indicated.

Description

A use-after-free vulnerability in the Linux kernel's bcmgenet network driver was fixed by ensuring Tx NAPI is stopped before disabling the transmit queues. The flaw allowed a transmit operation to access freed memory due to improper ordering of queue disabling and NAPI stopping, potentially causing kernel crashes. The issue was identified on Linux kernel version 6.15 and resolved in subsequent commits.

Impact

The vulnerability causes a use-after-free condition in the bcmgenet network driver, which can lead to kernel crashes or instability. There is no indication of remote code execution or privilege escalation, but system reliability is affected due to potential kernel memory corruption.

Summary

The Linux kernel's bcmgenet driver had a vulnerability where bcmgenet_netif_stop() and the Wake-on-LAN branch of bcmgenet_suspend() disabled Tx queues before stopping Tx NAPI. This sequence allowed a transmit completion callback to wake the queue after it was freed, leading to a use-after-free condition. The fix involved stopping Tx NAPI before disabling the queues on both code paths to prevent transmit operations from accessing freed memory. This was confirmed by KASAN detection on a Raspberry Pi CM4 triggered by an MTU change during suspend.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 10:25 UTC

Technical details

References

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