{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74527", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.912Z", "datePublished": "2026-08-15T12:27:43.568Z", "dateUpdated": "2026-08-17T05:48:16.718Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:48:16.718Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-af: Block VFs from clobbering special CGX PKIND state\n\nPF and VF NIX LFs that share a CGX LMAC reuse the same hardware PKIND\nprogramming. When HiGig2 or EDSA parsing is enabled, a VF NIX LF alloc must\nnot reset the LMAC RX PKIND or default TX parse config over the PF setup.\n\nAdd cgx_get_pkind() and rvu_cgx_is_pkind_config_permitted() so VFs skip\ncgx_set_pkind(), rvu_npc_set_pkind(), and NIX_AF_LFX_TX_PARSE_CFG updates\nwhen the LMAC is using NPC_RX_HIGIG_PKIND or NPC_RX_EDSA_PKIND." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Exploitation requires a malicious SR-IOV VF tenant to send NIX_LF_ALLOC mailbox messages over PCI BAR registers during netdev bring-up; the vulnerable AF code is not reachable from remote network packets.\nAC:L - In the target OcteonTX2 DSA/HiGig multi-tenant deployment, a VF reliably triggers the bug by opening its netdev; no races or attacker-uncontrollable memory layout are needed once HiGig/EDSA parsing is enabled on the shared LMAC.\nPR:L - The attacker is a cloud/NFV tenant with an assigned OcteonTX2 VF; triggering NIX LF allocation during interface up requires only guest-level netdev privileges (e.g., CAP_NET_ADMIN in the VM), not host root or init-namespace admin rights.\nUI:N - No victim interaction is required; the clobber occurs automatically when the attacker brings up or reinitializes their VF network interface through the standard driver probe/open path.\nS:C - A VF guest corrupts host-managed shared CGX LMAC hardware PKIND and NPC parse configuration, impacting the PF and other functions on that port beyond the VF's own security authority—crossing the VM/tenant isolation boundary.\nC:H - Resetting HiGig/EDSA RX PKIND misconfigures NPC packet parsing for the entire shared LMAC, potentially misdelivering or exposing fabric/switch-tagged traffic intended for the PF or other tenants to the attacker's VF.\nI:H - The VF forcibly overwrites shared LMAC RX PKIND via cgx_set_pkind() and programs default TX parse config, corrupting host-controlled switching-header parsing that governs how transmitted and received fabric traffic is processed on the port.\nA:H - Clobbering special HiGig/EDSA PKIND state breaks correct packet parsing for all PF/VF traffic on the shared LMAC, causing sustained loss of connectivity and denial of network service to the host and co-located tenants." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/marvell/octeontx2/af/cgx.c", "drivers/net/ethernet/marvell/octeontx2/af/cgx.h", "drivers/net/ethernet/marvell/octeontx2/af/rvu.h", "drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c", "drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c", "drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c" ], "versions": [ { "version": "94d942c5fb970ac2166216838b278613decfa9a0", "lessThan": "d3c6b0f48f126a36955b3fb4154a59d0b3621d97", "status": "affected", "versionType": "git" }, { "version": "94d942c5fb970ac2166216838b278613decfa9a0", "lessThan": "3bd438a58e910db5dc369aa25dfed1fc95f1b596", "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/marvell/octeontx2/af/cgx.c", "drivers/net/ethernet/marvell/octeontx2/af/cgx.h", "drivers/net/ethernet/marvell/octeontx2/af/rvu.h", "drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c", "drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c", "drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c" ], "versions": [ { "version": "4.20", "status": "affected" }, { "version": "0", "lessThan": "4.20", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "4.20", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d3c6b0f48f126a36955b3fb4154a59d0b3621d97" }, { "url": "https://git.kernel.org/stable/c/3bd438a58e910db5dc369aa25dfed1fc95f1b596" } ], "title": "octeontx2-af: Block VFs from clobbering special CGX PKIND state", "x_generator": { "engine": "bippy-1.2.0" } } } }