Vulnerability-Lookup

GHSA-VGC7-M4R9-XW45

Vulnerability from github – Published: 2026-01-25 15:30 – Updated: 2026-01-25 15:30

Details

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

macvlan: fix possible UAF in macvlan_forward_source()

Add RCU protection on (struct macvlan_source_entry)->vlan.

Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointer before RCU grace period starts.

This allows macvlan_forward_source() to skip over entries queued for freeing.

Note that macvlan_dev are already RCU protected, as they are embedded in a standard netdev (netdev_priv(ndev)).

https: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23001"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-25T15:15:54Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: fix possible UAF in macvlan_forward_source()\n\nAdd RCU protection on (struct macvlan_source_entry)-\u003evlan.\n\nWhenever macvlan_hash_del_source() is called, we must clear\nentry-\u003evlan pointer before RCU grace period starts.\n\nThis allows macvlan_forward_source() to skip over\nentries queued for freeing.\n\nNote that macvlan_dev are already RCU protected, as they\nare embedded in a standard netdev (netdev_priv(ndev)).\n\nhttps: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u",
  "id": "GHSA-vgc7-m4r9-xw45",
  "modified": "2026-01-25T15:30:27Z",
  "published": "2026-01-25T15:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23001"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6dbead9c7677186f22b7981dd085a0feec1f038e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7470a7a63dc162f07c26dbf960e41ee1e248d80e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8518712a2ca952d6da2238c6f0a16b4ae5ea3f13"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-23001 (GCVE-0-2026-23001)

Vulnerability from cvelistv5 – Published: 2026-01-25 14:36 – Updated: 2026-01-25 14:36

Title

macvlan: fix possible UAF in macvlan_forward_source()

Summary

In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointer before RCU grace period starts. This allows macvlan_forward_source() to skip over entries queued for freeing. Note that macvlan_dev are already RCU protected, as they are embedded in a standard netdev (netdev_priv(ndev)). https: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/8518712a2ca952d6d…
	https://git.kernel.org/stable/c/6dbead9c7677186f2…
	https://git.kernel.org/stable/c/7470a7a63dc162f07…

Impacted products

Vendor

Product

Version

Linux

Affected: 79cf79abce71eb7dbc40e2f3121048ca5405cb47 , < 8518712a2ca952d6da2238c6f0a16b4ae5ea3f13 (git)
Affected: 79cf79abce71eb7dbc40e2f3121048ca5405cb47 , < 6dbead9c7677186f22b7981dd085a0feec1f038e (git)
Affected: 79cf79abce71eb7dbc40e2f3121048ca5405cb47 , < 7470a7a63dc162f07c26dbf960e41ee1e248d80e (git)

Linux

Affected: 3.18
Unaffected: 0 , < 3.18 (semver)
Unaffected: 6.12.67 , ≤ 6.12.* (semver)
Unaffected: 6.18.7 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc6 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/macvlan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8518712a2ca952d6da2238c6f0a16b4ae5ea3f13",
              "status": "affected",
              "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47",
              "versionType": "git"
            },
            {
              "lessThan": "6dbead9c7677186f22b7981dd085a0feec1f038e",
              "status": "affected",
              "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47",
              "versionType": "git"
            },
            {
              "lessThan": "7470a7a63dc162f07c26dbf960e41ee1e248d80e",
              "status": "affected",
              "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/macvlan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.18"
            },
            {
              "lessThan": "3.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.67",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.67",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.7",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19-rc6",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: fix possible UAF in macvlan_forward_source()\n\nAdd RCU protection on (struct macvlan_source_entry)-\u003evlan.\n\nWhenever macvlan_hash_del_source() is called, we must clear\nentry-\u003evlan pointer before RCU grace period starts.\n\nThis allows macvlan_forward_source() to skip over\nentries queued for freeing.\n\nNote that macvlan_dev are already RCU protected, as they\nare embedded in a standard netdev (netdev_priv(ndev)).\n\nhttps: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-25T14:36:15.790Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8518712a2ca952d6da2238c6f0a16b4ae5ea3f13"
        },
        {
          "url": "https://git.kernel.org/stable/c/6dbead9c7677186f22b7981dd085a0feec1f038e"
        },
        {
          "url": "https://git.kernel.org/stable/c/7470a7a63dc162f07c26dbf960e41ee1e248d80e"
        }
      ],
      "title": "macvlan: fix possible UAF in macvlan_forward_source()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23001",
    "datePublished": "2026-01-25T14:36:15.790Z",
    "dateReserved": "2026-01-13T15:37:45.938Z",
    "dateUpdated": "2026-01-25T14:36:15.790Z",
    "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-VGC7-M4R9-XW45

CVE-2026-23001 (GCVE-0-2026-23001)

Tags

Sightings

Nomenclature