{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74527",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74527"
  ],
  "published": "2026-08-15T12:28:42Z",
  "summary": "octeontx2-af: Block VFs from clobbering special CGX PKIND state",
  "details": "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": null,
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74527"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d3c6b0f48f126a36955b3fb4154a59d0b3621d97"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3bd438a58e910db5dc369aa25dfed1fc95f1b596"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "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\u2014crossing 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."
    }
  }
}