github - ghsa-gp3c-chw3-pxcc

GHSA-GP3C-CHW3-PXCC

Vulnerability from github – Published: 2025-12-04 18:30 – Updated: 2025-12-04 18:30

Details

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

virtio-net: zero unused hash fields

When GSO tunnel is negotiated virtio_net_hdr_tnl_from_skb() tries to initialize the tunnel metadata but forget to zero unused rxhash fields. This may leak information to another side. Fixing this by zeroing the unused hash fields.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40236"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-04T16:16:16Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: zero unused hash fields\n\nWhen GSO tunnel is negotiated virtio_net_hdr_tnl_from_skb() tries to\ninitialize the tunnel metadata but forget to zero unused rxhash\nfields. This may leak information to another side. Fixing this by\nzeroing the unused hash fields.",
  "id": "GHSA-gp3c-chw3-pxcc",
  "modified": "2025-12-04T18:30:52Z",
  "published": "2025-12-04T18:30:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40236"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b2284768c6b32aa224ca7d0ef0741beb434f03aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b625d231c66a6041e98817ffc944bf6e4c45b2e3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-40236 (GCVE-0-2025-40236)

Vulnerability from cvelistv5 – Published: 2025-12-04 15:31 – Updated: 2025-12-04 15:31

Title

virtio-net: zero unused hash fields

Summary

In the Linux kernel, the following vulnerability has been resolved: virtio-net: zero unused hash fields When GSO tunnel is negotiated virtio_net_hdr_tnl_from_skb() tries to initialize the tunnel metadata but forget to zero unused rxhash fields. This may leak information to another side. Fixing this by zeroing the unused hash fields.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/b625d231c66a6041e…
	https://git.kernel.org/stable/c/b2284768c6b32aa22…

Impacted products

Vendor

Product

Version

Linux

Affected: a2fb4bc4e2a6a031683910d85b278c1d25ae5420 , < b625d231c66a6041e98817ffc944bf6e4c45b2e3 (git)
Affected: a2fb4bc4e2a6a031683910d85b278c1d25ae5420 , < b2284768c6b32aa224ca7d0ef0741beb434f03aa (git)

Linux

Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/virtio_net.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b625d231c66a6041e98817ffc944bf6e4c45b2e3",
              "status": "affected",
              "version": "a2fb4bc4e2a6a031683910d85b278c1d25ae5420",
              "versionType": "git"
            },
            {
              "lessThan": "b2284768c6b32aa224ca7d0ef0741beb434f03aa",
              "status": "affected",
              "version": "a2fb4bc4e2a6a031683910d85b278c1d25ae5420",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/virtio_net.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.6",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: zero unused hash fields\n\nWhen GSO tunnel is negotiated virtio_net_hdr_tnl_from_skb() tries to\ninitialize the tunnel metadata but forget to zero unused rxhash\nfields. This may leak information to another side. Fixing this by\nzeroing the unused hash fields."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-04T15:31:26.497Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b625d231c66a6041e98817ffc944bf6e4c45b2e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/b2284768c6b32aa224ca7d0ef0741beb434f03aa"
        }
      ],
      "title": "virtio-net: zero unused hash fields",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40236",
    "datePublished": "2025-12-04T15:31:26.497Z",
    "dateReserved": "2025-04-16T07:20:57.180Z",
    "dateUpdated": "2025-12-04T15:31:26.497Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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-GP3C-CHW3-PXCC

CVE-2025-40236 (GCVE-0-2025-40236)

Tags

Sightings

Nomenclature