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Review reviewCritical

CVE-2026-64125

Linux

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 bcmgen...

CVSS
9.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 9.8

Vulnerability overview

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 bcmgen...

Affected product and versions

Product
Linux
Affected versions
>= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 2040eb83f6ada148fb32dd98b943a498005d79f2, >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < f2782ddac82c70df313012da5f71f1f06b5553ca, >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < b579f3a73da7a7e74213558f4cc3d865c30aaa78, >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 289499907399c5a9f2ed82cb34df49112bb8488f, >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < a212fc08f5c48a16a94092bf0a9a8b7cf4483b11, >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 3d4ef05266ab16d8ef7dd21658a557801eb78704, >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 49bdf6bbb21b9c6e3f4d0c1910bf0ef98424be95, >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 9a1730245e416d11ad5c0f2c100061d61cc43f60, >= 3.19
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2026-64125 — Linux | SECUFOCUS NOW