Vulnerability-Lookup

GHSA-PP62-PWJ6-PPP4

Vulnerability from github – Published: 2026-05-01 15:30 – Updated: 2026-05-07 18:30

Details

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

net: ethernet: mtk_ppe: avoid NULL deref when gmac0 is disabled

If the gmac0 is disabled, the precheck for a valid ingress device will cause a NULL pointer deref and crash the system. This happens because eth->netdev[0] will be NULL but the code will directly try to access netdev_ops.

Instead of just checking for the first net_device, it must be checked if any of the mtk_eth net_devices is matching the netdev_ops of the ingress device.

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31736"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-01T15:16:36Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethernet: mtk_ppe: avoid NULL deref when gmac0 is disabled\n\nIf the gmac0 is disabled, the precheck for a valid ingress device will\ncause a NULL pointer deref and crash the system. This happens because\neth-\u003enetdev[0] will be NULL but the code will directly try to access\nnetdev_ops.\n\nInstead of just checking for the first net_device, it must be checked if\nany of the mtk_eth net_devices is matching the netdev_ops of the ingress\ndevice.",
  "id": "GHSA-pp62-pwj6-ppp4",
  "modified": "2026-05-07T18:30:34Z",
  "published": "2026-05-01T15:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31736"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0b832aad33e6f160fda310f0306a6483d85e9d6e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5dff799c677152dde963c3917bacd9127b03e145"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b2380f0a0e374010c1a4a13203511b9dee5b166"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/976ff48c2ac6e6b25b01428c9d7997bcd0fb2949"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-31736 (GCVE-0-2026-31736)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-11 22:14

Title

net: ethernet: mtk_ppe: avoid NULL deref when gmac0 is disabled

Summary

In the Linux kernel, the following vulnerability has been resolved: net: ethernet: mtk_ppe: avoid NULL deref when gmac0 is disabled If the gmac0 is disabled, the precheck for a valid ingress device will cause a NULL pointer deref and crash the system. This happens because eth->netdev[0] will be NULL but the code will directly try to access netdev_ops. Instead of just checking for the first net_device, it must be checked if any of the mtk_eth net_devices is matching the netdev_ops of the ingress device.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/0b832aad33e6f160f…
https://git.kernel.org/stable/c/5dff799c677152dde…
https://git.kernel.org/stable/c/7b2380f0a0e374010…
https://git.kernel.org/stable/c/976ff48c2ac6e6b25…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 73cfd947dbdb25ef9863ac49c4596a7d53ad4025 , < 0b832aad33e6f160fda310f0306a6483d85e9d6e (git) Affected: 73cfd947dbdb25ef9863ac49c4596a7d53ad4025 , < 5dff799c677152dde963c3917bacd9127b03e145 (git) Affected: 73cfd947dbdb25ef9863ac49c4596a7d53ad4025 , < 7b2380f0a0e374010c1a4a13203511b9dee5b166 (git) Affected: 73cfd947dbdb25ef9863ac49c4596a7d53ad4025 , < 976ff48c2ac6e6b25b01428c9d7997bcd0fb2949 (git)
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mediatek/mtk_ppe_offload.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0b832aad33e6f160fda310f0306a6483d85e9d6e",
              "status": "affected",
              "version": "73cfd947dbdb25ef9863ac49c4596a7d53ad4025",
              "versionType": "git"
            },
            {
              "lessThan": "5dff799c677152dde963c3917bacd9127b03e145",
              "status": "affected",
              "version": "73cfd947dbdb25ef9863ac49c4596a7d53ad4025",
              "versionType": "git"
            },
            {
              "lessThan": "7b2380f0a0e374010c1a4a13203511b9dee5b166",
              "status": "affected",
              "version": "73cfd947dbdb25ef9863ac49c4596a7d53ad4025",
              "versionType": "git"
            },
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              "lessThan": "976ff48c2ac6e6b25b01428c9d7997bcd0fb2949",
              "status": "affected",
              "version": "73cfd947dbdb25ef9863ac49c4596a7d53ad4025",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.81",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.22",
                  "versionStartIncluding": "6.11",
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                },
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                {
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                  "versionEndExcluding": "7.0",
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                  "vulnerable": true
                }
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethernet: mtk_ppe: avoid NULL deref when gmac0 is disabled\n\nIf the gmac0 is disabled, the precheck for a valid ingress device will\ncause a NULL pointer deref and crash the system. This happens because\neth-\u003enetdev[0] will be NULL but the code will directly try to access\nnetdev_ops.\n\nInstead of just checking for the first net_device, it must be checked if\nany of the mtk_eth net_devices is matching the netdev_ops of the ingress\ndevice."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:14:45.998Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31736",
    "datePublished": "2026-05-01T14:14:33.583Z",
    "dateReserved": "2026-03-09T15:48:24.137Z",
    "dateUpdated": "2026-05-11T22:14:45.998Z",
    "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.

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-PP62-PWJ6-PPP4

CVE-2026-31736 (GCVE-0-2026-31736)

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