{"id":"CVE-2026-64125","title":"net: bcmgenet: keep RBUF EEE/PM disabled","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmgenet: keep RBUF EEE/PM disabled\n\nSetting RBUF_EEE_EN | RBUF_PM_EN in RBUF_ENERGY_CTRL breaks the RX\npath on GENET hardware once MAC EEE becomes active. RX traf…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 2040eb83f6ada148fb32dd98b943a498005d79f2","Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < f2782ddac82c70df313012da5f71f1f06b5553ca","Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < b579f3a73da7a7e74213558f4cc3d865c30aaa78","Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 289499907399c5a9f2ed82cb34df49112bb8488f","Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < a212fc08f5c48a16a94092bf0a9a8b7cf4483b11","Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 3d4ef05266ab16d8ef7dd21658a557801eb78704","Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 49bdf6bbb21b9c6e3f4d0c1910bf0ef98424be95","Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 9a1730245e416d11ad5c0f2c100061d61cc43f60","Linux 3.19"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T15:36:46.782913Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:24.258Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64125","references":[{"url":"https://git.kernel.org/stable/c/2040eb83f6ada148fb32dd98b943a498005d79f2"},{"url":"https://git.kernel.org/stable/c/f2782ddac82c70df313012da5f71f1f06b5553ca"},{"url":"https://git.kernel.org/stable/c/b579f3a73da7a7e74213558f4cc3d865c30aaa78"},{"url":"https://git.kernel.org/stable/c/289499907399c5a9f2ed82cb34df49112bb8488f"},{"url":"https://git.kernel.org/stable/c/a212fc08f5c48a16a94092bf0a9a8b7cf4483b11"},{"url":"https://git.kernel.org/stable/c/3d4ef05266ab16d8ef7dd21658a557801eb78704"},{"url":"https://git.kernel.org/stable/c/49bdf6bbb21b9c6e3f4d0c1910bf0ef98424be95"},{"url":"https://git.kernel.org/stable/c/9a1730245e416d11ad5c0f2c100061d61cc43f60"}],"tags":["cve.org"],"epss":0.00552,"epssPercentile":0.44907,"ingestedAt":"2026-10-16T17:24:46.806Z","slug":"CVE-2026-64125","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmgenet: keep RBUF EEE/PM disabled\n\nSetting RBUF_EEE_EN | RBUF_PM_EN in RBUF_ENERGY_CTRL breaks the RX\npath on GENET hardware once MAC EEE becomes active. RX traffic stops\nflowing while the link stays up and the usual descriptor/RX error\ncounters remain quiet. In that state the MAC still accepts frames\n(rbuf_ovflow_cnt keeps climbing) but RBUF no longer forwards them to\nDMA, so rx_packets is no longer incremented at the netdev level. On\nsome boards the corruption ends up as a paging fault in\nskb_release_data via bcmgenet_rx_poll on an LPI exit.\n\nReproduced on Pi 4B (BCM2711 + BCM54213PE) and confirmed by Florian\nFainelli on an internal Broadcom 4908-family board with the same crash\nsignature. RBUF_PM_EN is not publicly documented.\n\nThis shows up more often now that phy_support_eee() enables EEE by\ndefault, but it also affects older kernels as soon as TX LPI is\nturned on via ethtool, so it is not specific to recent changes.\n\nAlways clear RBUF_EEE_EN | RBUF_PM_EN in bcmgenet_eee_enable_set so\nthe bits stay off across resets. UMAC and TBUF setup is left alone so\nTX-side EEE keeps working.\n\n## Affected\n\n- `Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 2040eb83f6ada148fb32dd98b943a498005d79f2`\n- `Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < f2782ddac82c70df313012da5f71f1f06b5553ca`\n- `Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < b579f3a73da7a7e74213558f4cc3d865c30aaa78`\n- `Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 289499907399c5a9f2ed82cb34df49112bb8488f`\n- `Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < a212fc08f5c48a16a94092bf0a9a8b7cf4483b11`\n- `Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 3d4ef05266ab16d8ef7dd21658a557801eb78704`\n- `Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 49bdf6bbb21b9c6e3f4d0c1910bf0ef98424be95`\n- `Linux >= 6ef398ea60d931b97d69ed080bd0bd00fac38ec6 < 9a1730245e416d11ad5c0f2c100061d61cc43f60`\n- `Linux 3.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}