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NVD / CVE Program· CNA Linux

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

CriticalCVSS 9.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 39/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.55% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 2040eb83f6ada148fb32dd98b943a498005d79f2, 289499907399c5a9f2ed82cb34df49112bb8488f, 3d4ef05266ab16d8ef7dd21658a557801eb78704.

Low priority for now. Upgrade to Linux Linux 2040eb83f6ada148fb32dd98b943a498005d79f2, 289499907399c5a9f2ed82cb34df49112bb8488f, 3d4ef05266ab16d8ef7dd21658a557801eb78704 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Jul 19, 2026
Updated
Oct 19, 2026
EPSS
0.5% · 46th percentile
CWE
—

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-64125

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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.19affected
    • 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 and later · before 2040eb83f6ada148fb32dd98b943a498005d79f2affected · git
    • 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 and later · before f2782ddac82c70df313012da5f71f1f06b5553caaffected · git
    • 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 and later · before b579f3a73da7a7e74213558f4cc3d865c30aaa78affected · git
    • 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 and later · before 289499907399c5a9f2ed82cb34df49112bb8488faffected · git
    • 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 and later · before a212fc08f5c48a16a94092bf0a9a8b7cf4483b11affected · git
    • 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 and later · before 3d4ef05266ab16d8ef7dd21658a557801eb78704affected · git
    • 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 and later · before 49bdf6bbb21b9c6e3f4d0c1910bf0ef98424be95affected · git
    • 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 and later · before 9a1730245e416d11ad5c0f2c100061d61cc43f60affected · git
    • before 3.19not affected · semver
Affected versions · NVD (8)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel3.19 and later · before 5.10.258
  • linux linux kernel5.11 and later · before 5.15.209
  • linux linux kernel5.16 and later · before 6.1.175
  • linux linux kernel6.2 and later · before 6.6.142
  • linux linux kernel6.7 and later · before 6.12.92
  • linux linux kernel6.13 and later · before 6.18.34
  • linux linux kernel6.19 and later · before 7.0.11
  • linux linux kernel7.1

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.12-17.0.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-64121Jul 19, 2026 · net: ifb: report ethtool stats over num_tx_queues
    28Monitor
  • ← EarlierCVE-2026-64123Jul 19, 2026 · net: hsr: defer node table free until after RCU readers
    31Monitor
  • Later →CVE-2026-64126Jul 19, 2026 · Bluetooth: MGMT: validate Add Extended Advertising Data length
    29Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2040eb83f6ada148fb32dd98b943a498005d79f2Vendor (CNA)
Linux Linux289499907399c5a9f2ed82cb34df49112bb8488fVendor (CNA)
Linux Linux3d4ef05266ab16d8ef7dd21658a557801eb78704Vendor (CNA)
Linux Linux49bdf6bbb21b9c6e3f4d0c1910bf0ef98424be95Vendor (CNA)
Linux Linux9a1730245e416d11ad5c0f2c100061d61cc43f60Vendor (CNA)
Linux Linuxa212fc08f5c48a16a94092bf0a9a8b7cf4483b11Vendor (CNA)
Linux Linuxb579f3a73da7a7e74213558f4cc3d865c30aaa78Vendor (CNA)
Linux Linuxf2782ddac82c70df313012da5f71f1f06b5553caVendor (CNA)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records