{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64125", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.036Z", "datePublished": "2026-07-19T15:40:22.590Z", "dateUpdated": "2026-08-05T12:39:31.893Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:39:31.893Z" }, "descriptions": [ { "lang": "en", "value": "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 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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The fault is reached in `bcmgenet_rx_poll` during NAPI processing of received Ethernet frames; any remote host that can send traffic to a GENET-equipped, network-connected target (e.g., internet-exposed Raspberry Pi, Broadcom gateway, or edge IoT device) can drive RX activity and LPI exit transitions that trigger the corrupted RX path.\nAC:L - On affected GENET hardware with an EEE-capable link partner (now common and enabled by default via `phy_support_eee()`), the bug reproduces within minutes under normal RX load without attacker-influenced memory layout, and the attacker controls timing by sending sustained or bursty traffic to force LPI entry/exit cycles.\nPR:N - Exploitation does not require authentication or elevated privileges; EEE is enabled automatically at link-up through `bcmgenet_mii_setup()` → `bcmgenet_eee_enable_set()`, so a remote attacker only needs the ability to send network packets to the target interface.\nUI:N - No victim action is required beyond the device having a normal link with EEE-capable equipment; the misconfigured RBUF registers and subsequent RX stall or kernel oops occur during routine background network activity.\nS:U - Impact is confined to kernel/network availability on the same host (RX path stall, skb corruption, and kernel panic); there is no demonstrated crossing of a VM, container, or IOMMU security boundary.\nC:H - Hardware RX desynchronization from incorrectly enabled `RBUF_EEE_EN|RBUF_PM_EN` corrupts skb/DMA ring state and manifests as invalid pointers in `skb_release_data` during `bcmgenet_rx_poll`, consistent with use-after-free/double-free class corruption that can enable arbitrary kernel memory disclosure.\nI:H - The same skb pointer corruption in the RX teardown path can yield heap write primitives (double-free/incorrect free of sk_buff metadata) during LPI exit, which is the class of memory corruption typically leveraged for kernel control-flow hijacking.\nA:H - The bug reliably causes complete RX failure (silent loss of connectivity while the link remains up) and can escalate to a fatal kernel oops/panic in softirq context, constituting total loss of network availability and potential full system availability loss." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/broadcom/genet/bcmgenet.c" ], "versions": [ { "version": "6ef398ea60d931b97d69ed080bd0bd00fac38ec6", "lessThan": "2040eb83f6ada148fb32dd98b943a498005d79f2", "status": "affected", "versionType": "git" }, { "version": "6ef398ea60d931b97d69ed080bd0bd00fac38ec6", "lessThan": "f2782ddac82c70df313012da5f71f1f06b5553ca", "status": "affected", "versionType": "git" }, { "version": "6ef398ea60d931b97d69ed080bd0bd00fac38ec6", "lessThan": "b579f3a73da7a7e74213558f4cc3d865c30aaa78", "status": "affected", "versionType": "git" }, { "version": "6ef398ea60d931b97d69ed080bd0bd00fac38ec6", "lessThan": "289499907399c5a9f2ed82cb34df49112bb8488f", "status": "affected", "versionType": "git" }, { "version": "6ef398ea60d931b97d69ed080bd0bd00fac38ec6", "lessThan": "a212fc08f5c48a16a94092bf0a9a8b7cf4483b11", "status": "affected", "versionType": "git" }, { "version": "6ef398ea60d931b97d69ed080bd0bd00fac38ec6", "lessThan": "3d4ef05266ab16d8ef7dd21658a557801eb78704", "status": "affected", "versionType": "git" }, { "version": "6ef398ea60d931b97d69ed080bd0bd00fac38ec6", "lessThan": "49bdf6bbb21b9c6e3f4d0c1910bf0ef98424be95", "status": "affected", "versionType": "git" }, { "version": "6ef398ea60d931b97d69ed080bd0bd00fac38ec6", "lessThan": "9a1730245e416d11ad5c0f2c100061d61cc43f60", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/broadcom/genet/bcmgenet.c" ], "versions": [ { "version": "3.19", "status": "affected" }, { "version": "0", "lessThan": "3.19", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.142", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.6.142" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.12.92" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.18.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "7.0.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "7.1" } ] } ] } ], "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" } ], "title": "net: bcmgenet: keep RBUF EEE/PM disabled", "x_generator": { "engine": "bippy-1.2.0" } } } }