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Linux CVE-2026-64125

| EUVDEUVD-2026-45810 CRITICAL
2026-07-19 Linux GHSA-89rr-cfw2-c9px
Linux Broadcom Denial Of Service
Critical
Disputed · 9.8 Vendor: Linux
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Severity by source

Sources disagree (Medium–Critical)
Vendor (Linux) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
CRITICAL
qualitative
Red Hat
5.5 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: Linux

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jul 20, 2026 - 17:36 vuln.today
CVSS changed
Jul 20, 2026 - 15:22 NVD
9.8 (CRITICAL)
Patch available
Jul 19, 2026 - 17:03 EUVD
CVE Published
Jul 19, 2026 - 15:40 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 19, 2026 - 15:40 cve.org
CRITICAL 9.8

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

net: bcmgenet: keep RBUF EEE/PM disabled

Setting RBUF_EEE_EN | RBUF_PM_EN in RBUF_ENERGY_CTRL breaks the RX path on GENET hardware once MAC EEE becomes active. RX traffic stops flowing while the link stays up and the usual descriptor/RX error counters remain quiet. In that state the MAC still accepts frames (rbuf_ovflow_cnt keeps climbing) but RBUF no longer forwards them to DMA, so rx_packets is no longer incremented at the netdev level. On some boards the corruption ends up as a paging fault in skb_release_data via bcmgenet_rx_poll on an LPI exit.

Reproduced on Pi 4B (BCM2711 + BCM54213PE) and confirmed by Florian Fainelli on an internal Broadcom 4908-family board with the same crash signature. RBUF_PM_EN is not publicly documented.

This shows up more often now that phy_support_eee() enables EEE by default, but it also affects older kernels as soon as TX LPI is turned on via ethtool, so it is not specific to recent changes.

Always clear RBUF_EEE_EN | RBUF_PM_EN in bcmgenet_eee_enable_set so the bits stay off across resets. UMAC and TBUF setup is left alone so TX-side EEE keeps working.

AnalysisAI

Denial-of-service and memory corruption in the Linux kernel's Broadcom GENET (bcmgenet) Ethernet driver occurs when RBUF_EEE_EN and RBUF_PM_EN are set in RBUF_ENERGY_CTRL and MAC Energy-Efficient Ethernet becomes active, silently halting the RX path while the link stays up and, on some boards, triggering a paging fault in skb_release_data via bcmgenet_rx_poll on an LPI exit. It affects Linux systems using Broadcom GENET NICs (e.g. Raspberry Pi 4B/BCM2711, Broadcom 4908-family SoCs), and is triggered by default now that phy_support_eee() enables EEE automatically, or on older kernels once TX LPI is enabled via ethtool. No public exploit identified at time of analysis; EPSS is low at 0.18% (8th percentile), and the CISA-KEV / attacker-controlled framing implied by the CVSS 9.8 does not match the local hardware-interaction nature of the bug.

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

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CVE-2026-64125 vulnerability details – vuln.today
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