Vulnerability-Lookup

GHSA-VG39-X84F-CGRF

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-17 06:33

Details

In the Linux kernel, the following vulnerability has been resolved:

octeontx2-af: Block VFs from clobbering special CGX PKIND state

PF and VF NIX LFs that share a CGX LMAC reuse the same hardware PKIND programming. When HiGig2 or EDSA parsing is enabled, a VF NIX LF alloc must not reset the LMAC RX PKIND or default TX parse config over the PF setup.

Add cgx_get_pkind() and rvu_cgx_is_pkind_config_permitted() so VFs skip cgx_set_pkind(), rvu_npc_set_pkind(), and NIX_AF_LFX_TX_PARSE_CFG updates when the LMAC is using NPC_RX_HIGIG_PKIND or NPC_RX_EDSA_PKIND.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74527"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:57Z",
    "severity": "HIGH"
  },
  "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.",
  "id": "GHSA-vg39-x84f-cgrf",
  "modified": "2026-08-17T06:33:50Z",
  "published": "2026-08-15T15:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74527"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3bd438a58e910db5dc369aa25dfed1fc95f1b596"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3c6b0f48f126a36955b3fb4154a59d0b3621d97"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74527 (GCVE-0-2026-74527)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-17 05:48

Title

octeontx2-af: Block VFs from clobbering special CGX PKIND state

Summary

In the Linux kernel, the following vulnerability has been resolved: octeontx2-af: Block VFs from clobbering special CGX PKIND state PF and VF NIX LFs that share a CGX LMAC reuse the same hardware PKIND programming. When HiGig2 or EDSA parsing is enabled, a VF NIX LF alloc must not reset the LMAC RX PKIND or default TX parse config over the PF setup. Add cgx_get_pkind() and rvu_cgx_is_pkind_config_permitted() so VFs skip cgx_set_pkind(), rvu_npc_set_pkind(), and NIX_AF_LFX_TX_PARSE_CFG updates when the LMAC is using NPC_RX_HIGIG_PKIND or NPC_RX_EDSA_PKIND.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/d3c6b0f48f126a369…
https://git.kernel.org/stable/c/3bd438a58e910db5d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 94d942c5fb970ac2166216838b278613decfa9a0 , < d3c6b0f48f126a36955b3fb4154a59d0b3621d97 (git) Affected: 94d942c5fb970ac2166216838b278613decfa9a0 , < 3bd438a58e910db5dc369aa25dfed1fc95f1b596 (git)
Linux	Linux	Affected: 4.20 Unaffected: 0 , < 4.20 (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "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"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d3c6b0f48f126a36955b3fb4154a59d0b3621d97",
              "status": "affected",
              "version": "94d942c5fb970ac2166216838b278613decfa9a0",
              "versionType": "git"
            },
            {
              "lessThan": "3bd438a58e910db5dc369aa25dfed1fc95f1b596",
              "status": "affected",
              "version": "94d942c5fb970ac2166216838b278613decfa9a0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "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"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.20"
            },
            {
              "lessThan": "4.20",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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\u0027s 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\u0027s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:48:16.718Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74527",
    "datePublished": "2026-08-15T12:27:43.568Z",
    "dateReserved": "2026-08-15T05:44:03.912Z",
    "dateUpdated": "2026-08-17T05:48:16.718Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-VG39-X84F-CGRF

CVE-2026-74527 (GCVE-0-2026-74527)

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Nomenclature