Vulnerability-Lookup

GHSA-HF4R-HM8M-W52J

Vulnerability from github – Published: 2026-06-09 15:32 – Updated: 2026-06-09 15:32

Details

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

net: gro: don't merge zcopy skbs

skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS flag.

When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference on the pages in shinfo->frags. Appending those frags to another skb's frags without fixing up the page refcount can lead to UAF.

When either the last skb in the GRO chain (the one we would append frags to) or the source skb is zerocopy, don't merge the skbs.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46323"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-09T13:16:37Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gro: don\u0027t merge zcopy skbs\n\nskb_gro_receive() can currently copy frags between the source and GRO\nskb, without checking the zerocopy status, and in particular the\nSKBFL_MANAGED_FRAG_REFS flag.\n\nWhen SKBFL_MANAGED_FRAG_REFS is set, the skb doesn\u0027t hold a reference\non the pages in shinfo-\u003efrags. Appending those frags to another skb\u0027s\nfrags without fixing up the page refcount can lead to UAF.\n\nWhen either the last skb in the GRO chain (the one we would append\nfrags to) or the source skb is zerocopy, don\u0027t merge the skbs.",
  "id": "GHSA-hf4r-hm8m-w52j",
  "modified": "2026-06-09T15:32:18Z",
  "published": "2026-06-09T15:32:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46323"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46323 (GCVE-0-2026-46323)

Vulnerability from cvelistv5 – Published: 2026-06-09 12:11 – Updated: 2026-06-09 12:11

Title

net: gro: don't merge zcopy skbs

Summary

In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS flag. When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference on the pages in shinfo->frags. Appending those frags to another skb's frags without fixing up the page refcount can lead to UAF. When either the last skb in the GRO chain (the one we would append frags to) or the source skb is zerocopy, don't merge the skbs.

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/1f9c828556416fbe3…
https://git.kernel.org/stable/c/479084ae0e1d9cb79…
https://git.kernel.org/stable/c/e334cbf3388fd9334…
https://git.kernel.org/stable/c/44bea2032af0425e4…
https://git.kernel.org/stable/c/4db79a322db8c97f7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 753f1ca4e1e50248a1b760c9774d6d6b354562cc , < 1f9c828556416fbe3f49386708ce999fc4d4da06 (git) Affected: 753f1ca4e1e50248a1b760c9774d6d6b354562cc , < 479084ae0e1d9cb7929cb4298d35623de189f80a (git) Affected: 753f1ca4e1e50248a1b760c9774d6d6b354562cc , < e334cbf3388fd9334503a778a82d9e9f14dd2f71 (git) Affected: 753f1ca4e1e50248a1b760c9774d6d6b354562cc , < 44bea2032af0425e4ce6d26a8af0ede79db49ec1 (git) Affected: 753f1ca4e1e50248a1b760c9774d6d6b354562cc , < 4db79a322db8c97f7b73b8a347395ef4d685eb40 (git)
Linux	Linux	Affected: 6.0 Unaffected: 0 , < 6.0 (semver) Unaffected: 6.6.142 , ≤ 6.6.* (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1-rc5 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/gro.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1f9c828556416fbe3f49386708ce999fc4d4da06",
              "status": "affected",
              "version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
              "versionType": "git"
            },
            {
              "lessThan": "479084ae0e1d9cb7929cb4298d35623de189f80a",
              "status": "affected",
              "version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
              "versionType": "git"
            },
            {
              "lessThan": "e334cbf3388fd9334503a778a82d9e9f14dd2f71",
              "status": "affected",
              "version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
              "versionType": "git"
            },
            {
              "lessThan": "44bea2032af0425e4ce6d26a8af0ede79db49ec1",
              "status": "affected",
              "version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
              "versionType": "git"
            },
            {
              "lessThan": "4db79a322db8c97f7b73b8a347395ef4d685eb40",
              "status": "affected",
              "version": "753f1ca4e1e50248a1b760c9774d6d6b354562cc",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/gro.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.142",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.92",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                },
                {
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                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gro: don\u0027t merge zcopy skbs\n\nskb_gro_receive() can currently copy frags between the source and GRO\nskb, without checking the zerocopy status, and in particular the\nSKBFL_MANAGED_FRAG_REFS flag.\n\nWhen SKBFL_MANAGED_FRAG_REFS is set, the skb doesn\u0027t hold a reference\non the pages in shinfo-\u003efrags. Appending those frags to another skb\u0027s\nfrags without fixing up the page refcount can lead to UAF.\n\nWhen either the last skb in the GRO chain (the one we would append\nfrags to) or the source skb is zerocopy, don\u0027t merge the skbs."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-09T12:11:15.562Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06"
        },
        {
          "url": "https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a"
        },
        {
          "url": "https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71"
        },
        {
          "url": "https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1"
        },
        {
          "url": "https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40"
        }
      ],
      "title": "net: gro: don\u0027t merge zcopy skbs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46323",
    "datePublished": "2026-06-09T12:11:15.562Z",
    "dateReserved": "2026-05-13T15:03:33.112Z",
    "dateUpdated": "2026-06-09T12:11:15.562Z",
    "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.

Action not permitted

GHSA-HF4R-HM8M-W52J

CVE-2026-46323 (GCVE-0-2026-46323)

Tags

Sightings

Nomenclature