Vulnerability-Lookup

GHSA-87W2-PJWV-62X9

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

octeontx2-af: fix VF bringup affecting PF promiscuous state

Mbox handling of nix_set_rx_mode for a VF with promiscuous and all_multi flags set to false causes deletion of the PF's promiscuous and allmulti MCAM rules. This occurs because the APIs that enable/disable these rules operate only on the PF, even when the mbox request is made via a VF interface.

Guard both rvu_npc_enable_allmulti_entry() and rvu_npc_enable_promisc_entry() disable paths with an is_vf() check so that a VF bringing up or tearing down its interface cannot inadvertently clear the PF's MCAM rules.

Severity

7.9 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72312"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:04Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-af: fix VF bringup affecting PF promiscuous state\n\nMbox handling of nix_set_rx_mode for a VF with promiscuous and\nall_multi flags set to false causes deletion of the PF\u0027s promiscuous\nand allmulti MCAM rules. This occurs because the APIs that\nenable/disable these rules operate only on the PF, even when the\nmbox request is made via a VF interface.\n\nGuard both rvu_npc_enable_allmulti_entry() and\nrvu_npc_enable_promisc_entry() disable paths with an is_vf() check so\nthat a VF bringing up or tearing down its interface cannot inadvertently\nclear the PF\u0027s MCAM rules.",
  "id": "GHSA-87w2-pjwv-62x9",
  "modified": "2026-08-17T06:33:23Z",
  "published": "2026-08-15T06:32:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72312"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/212c59e5e416859579272288fd325148fc316109"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3cf83432e0561aef6d7ec2664909d12d0ff0ffc1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3de77d2f34c2bc2acaedabc2c5e0a561b85c283a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53e17d9ed779ad25870abb9c31bc294c71a2278c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/daa2451640a3e0727fd598f5c2ccb8bb4d5a8b9c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fabb881df322da25442f98d23f5fa371e3c78ec4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72312 (GCVE-0-2026-72312)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:42

Title

octeontx2-af: fix VF bringup affecting PF promiscuous state

Summary

In the Linux kernel, the following vulnerability has been resolved: octeontx2-af: fix VF bringup affecting PF promiscuous state Mbox handling of nix_set_rx_mode for a VF with promiscuous and all_multi flags set to false causes deletion of the PF's promiscuous and allmulti MCAM rules. This occurs because the APIs that enable/disable these rules operate only on the PF, even when the mbox request is made via a VF interface. Guard both rvu_npc_enable_allmulti_entry() and rvu_npc_enable_promisc_entry() disable paths with an is_vf() check so that a VF bringing up or tearing down its interface cannot inadvertently clear the PF's MCAM rules.

Severity

7.9 (High)


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

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/daa2451640a3e0727…
https://git.kernel.org/stable/c/212c59e5e41685957…
https://git.kernel.org/stable/c/53e17d9ed779ad258…
https://git.kernel.org/stable/c/3de77d2f34c2bc2ac…
https://git.kernel.org/stable/c/3cf83432e0561aef6…
https://git.kernel.org/stable/c/fabb881df322da254…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 967db3529ecac305d230aa4e60abddf6ab63543a , < daa2451640a3e0727fd598f5c2ccb8bb4d5a8b9c (git) Affected: 967db3529ecac305d230aa4e60abddf6ab63543a , < 212c59e5e416859579272288fd325148fc316109 (git) Affected: 967db3529ecac305d230aa4e60abddf6ab63543a , < 53e17d9ed779ad25870abb9c31bc294c71a2278c (git) Affected: 967db3529ecac305d230aa4e60abddf6ab63543a , < 3de77d2f34c2bc2acaedabc2c5e0a561b85c283a (git) Affected: 967db3529ecac305d230aa4e60abddf6ab63543a , < 3cf83432e0561aef6d7ec2664909d12d0ff0ffc1 (git) Affected: 967db3529ecac305d230aa4e60abddf6ab63543a , < fabb881df322da25442f98d23f5fa371e3c78ec4 (git)
Linux	Linux	Affected: 5.14 Unaffected: 0 , < 5.14 (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 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/rvu_nix.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "daa2451640a3e0727fd598f5c2ccb8bb4d5a8b9c",
              "status": "affected",
              "version": "967db3529ecac305d230aa4e60abddf6ab63543a",
              "versionType": "git"
            },
            {
              "lessThan": "212c59e5e416859579272288fd325148fc316109",
              "status": "affected",
              "version": "967db3529ecac305d230aa4e60abddf6ab63543a",
              "versionType": "git"
            },
            {
              "lessThan": "53e17d9ed779ad25870abb9c31bc294c71a2278c",
              "status": "affected",
              "version": "967db3529ecac305d230aa4e60abddf6ab63543a",
              "versionType": "git"
            },
            {
              "lessThan": "3de77d2f34c2bc2acaedabc2c5e0a561b85c283a",
              "status": "affected",
              "version": "967db3529ecac305d230aa4e60abddf6ab63543a",
              "versionType": "git"
            },
            {
              "lessThan": "3cf83432e0561aef6d7ec2664909d12d0ff0ffc1",
              "status": "affected",
              "version": "967db3529ecac305d230aa4e60abddf6ab63543a",
              "versionType": "git"
            },
            {
              "lessThan": "fabb881df322da25442f98d23f5fa371e3c78ec4",
              "status": "affected",
              "version": "967db3529ecac305d230aa4e60abddf6ab63543a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "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": "6.1.178",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "5.14",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-af: fix VF bringup affecting PF promiscuous state\n\nMbox handling of nix_set_rx_mode for a VF with promiscuous and\nall_multi flags set to false causes deletion of the PF\u0027s promiscuous\nand allmulti MCAM rules. This occurs because the APIs that\nenable/disable these rules operate only on the PF, even when the\nmbox request is made via a VF interface.\n\nGuard both rvu_npc_enable_allmulti_entry() and\nrvu_npc_enable_promisc_entry() disable paths with an is_vf() check so\nthat a VF bringing up or tearing down its interface cannot inadvertently\nclear the PF\u0027s MCAM rules."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.9,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires local control of an SR-IOV VF netdev on Marvell OcteonTX2/CN10K hardware; the bug is triggered via the VF driver\u0027s mailbox to the AF (rvu_mbox_handler_nix_set_rx_mode), not by remote packet delivery.\nAC:L - An attacker with VF netdev access can reliably trigger the flaw by bringing the interface up/down or changing rx_mode (e.g., ip link set up), which sends NIX_SET_RX_MODE with promisc/allmulti cleared; no race or victim timing is required.\nPR:L - Only guest/namespace CAP_NET_ADMIN (or equivalent root in an SR-IOV-assigned VM) is needed to manage the VF netdev; host init-namespace root is not required and user namespaces cannot reach this hardware path without the VF device.\nUI:N - No victim interaction is needed; the attacker initiates VF interface bringup/teardown or rx_mode updates that invoke otx2_do_set_rx_mode/otx2vf_do_set_rx_mode and the AF mbox handler.\nS:C - A VF tenant can alter PF-side NPC MCAM promiscuous/allmulti rules (rvu_npc_enable_promisc_entry/rvu_npc_enable_allmulti_entry mask pcifunc to the PF), crossing the SR-IOV isolation boundary between guest/tenant and host/provider packet filtering.\nC:L - Disabling the PF promiscuous/allmulti MCAM entries can blind host IDS/tcpdump and other monitoring that depends on promiscuous reception, reducing visibility into network traffic on the affected PF (limited confidentiality impact, not arbitrary kernel memory read).\nI:L - The VF causes unauthorized modification of host-side hardware packet-filter state by disabling PF MCAM promisc/allmulti rules; this is limited integrity impact on network policy rather than arbitrary memory or code execution.\nA:H - Clearing PF promiscuous and allmulti MCAM rules can break or degrade PF multicast delivery and promiscuous capture/monitoring on internet-facing cloud/edge servers using these NICs, and can be repeated by cycling the VF interface."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:42:39.727Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/daa2451640a3e0727fd598f5c2ccb8bb4d5a8b9c"
        },
        {
          "url": "https://git.kernel.org/stable/c/212c59e5e416859579272288fd325148fc316109"
        },
        {
          "url": "https://git.kernel.org/stable/c/53e17d9ed779ad25870abb9c31bc294c71a2278c"
        },
        {
          "url": "https://git.kernel.org/stable/c/3de77d2f34c2bc2acaedabc2c5e0a561b85c283a"
        },
        {
          "url": "https://git.kernel.org/stable/c/3cf83432e0561aef6d7ec2664909d12d0ff0ffc1"
        },
        {
          "url": "https://git.kernel.org/stable/c/fabb881df322da25442f98d23f5fa371e3c78ec4"
        }
      ],
      "title": "octeontx2-af: fix VF bringup affecting PF promiscuous state",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72312",
    "datePublished": "2026-08-15T05:55:27.817Z",
    "dateReserved": "2026-08-09T03:40:39.918Z",
    "dateUpdated": "2026-08-17T05:42:39.727Z",
    "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.

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GHSA-87W2-PJWV-62X9

CVE-2026-72312 (GCVE-0-2026-72312)

Tags

Sightings

Nomenclature