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VulnerabilityPublished Updated

CVE-2026-64125: Linux kernel · net: bcmgenet: keep RBUF EEE/PM disabled

Affects Linux kernelSource CVE Database V5

0

Not known to be exploited · CVSS 9.8 Critical · fixed in f2782ddac82c70df313012da5f71f1f06b5553ca : patch Linux kernel as a priority.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 45% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers can reliably automate steps 1–4 of the kill chain
Technical impact
Total control over the software or total information disclosure

CISA SSVC assessment, 2026-10-16.

Patch
Available – fixed in f2782ddac82c70df313012da5f71f1f06b5553ca, b579f3a73da7a7e74213558f4cc3d865c30aaa78, a212fc08f5c48a16a94092bf0a9a8b7cf4483b11 +5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 19 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 6ef398ea60d931b97d69ed080bd0bd00fac38ec6, < f2782ddac82c70df313012da5f71f1f06b5553ca
Fixed in
  • f2782ddac82c70df313012da5f71f1f06b5553ca
LinuxLinuxAffected
  • ≥ 6ef398ea60d931b97d69ed080bd0bd00fac38ec6, < b579f3a73da7a7e74213558f4cc3d865c30aaa78
Fixed in
  • b579f3a73da7a7e74213558f4cc3d865c30aaa78
LinuxLinuxAffected
  • ≥ 6ef398ea60d931b97d69ed080bd0bd00fac38ec6, < a212fc08f5c48a16a94092bf0a9a8b7cf4483b11
Fixed in
  • a212fc08f5c48a16a94092bf0a9a8b7cf4483b11
LinuxLinuxAffected
  • ≥ 6ef398ea60d931b97d69ed080bd0bd00fac38ec6, < 289499907399c5a9f2ed82cb34df49112bb8488f
Fixed in
  • 289499907399c5a9f2ed82cb34df49112bb8488f
LinuxLinuxAffected
  • ≥ 6ef398ea60d931b97d69ed080bd0bd00fac38ec6, < 2040eb83f6ada148fb32dd98b943a498005d79f2
Fixed in
  • 2040eb83f6ada148fb32dd98b943a498005d79f2
LinuxLinuxAffected
  • ≥ 6ef398ea60d931b97d69ed080bd0bd00fac38ec6, < 49bdf6bbb21b9c6e3f4d0c1910bf0ef98424be95
Fixed in
  • 49bdf6bbb21b9c6e3f4d0c1910bf0ef98424be95

Description

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.

References

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