Vulnerability-Lookup

GHSA-FFM7-9F73-PVMF

Vulnerability from github – Published: 2026-06-24 09:30 – Updated: 2026-06-28 09:31

Details

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

netfilter: nf_queue: hold bridge skb->dev while queued

br_pass_frame_up() rewrites skb->dev from the ingress port to the bridge master before queueing bridge LOCAL_IN packets. NFQUEUE only holds references on state.in/out and bridge physdevs, so a queued bridge packet can retain a freed bridge master in skb->dev until reinjection.

When the verdict is reinjected later, br_netif_receive_skb() re-enters the receive path with skb->dev still pointing at the freed bridge master, triggering a use-after-free.

Store skb->dev in the queue entry, hold a reference on it for the queue lifetime, and use the saved device when dropping queued packets during NETDEV_DOWN handling.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-52912"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T08:16:20Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_queue: hold bridge skb-\u003edev while queued\n\nbr_pass_frame_up() rewrites skb-\u003edev from the ingress port to the bridge\nmaster before queueing bridge LOCAL_IN packets. NFQUEUE only holds\nreferences on state.in/out and bridge physdevs, so a queued bridge\npacket can retain a freed bridge master in skb-\u003edev until reinjection.\n\nWhen the verdict is reinjected later, br_netif_receive_skb() re-enters\nthe receive path with skb-\u003edev still pointing at the freed bridge master,\ntriggering a use-after-free.\n\nStore skb-\u003edev in the queue entry, hold a reference on it for the queue\nlifetime, and use the saved device when dropping queued packets during\nNETDEV_DOWN handling.",
  "id": "GHSA-ffm7-9f73-pvmf",
  "modified": "2026-06-28T09:31:35Z",
  "published": "2026-06-24T09:30:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52912"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15d464265120ab9818bd673af301deee09bedab2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/19924bdd8a45ebc72a7b84c57fd63057d1dc75ac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1e5e20031c5eee8d2e490a90ff4d6a2feecfc3be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3823c27099cfe2482299065814adbaa771be9644"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3fb0f5c0f64162a8c3f25616a4f1e340b921737f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/950d809f154dca04e5fbe5d3c8b9c5e44769cd57"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a698ac8ab2561cf575d2d9f34095032651dd952e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e196115ec330a18de415bdb9f5071aa9f08e53ce"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-52912 (GCVE-0-2026-52912)

Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-06-28 06:36

Title

netfilter: nf_queue: hold bridge skb->dev while queued

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_queue: hold bridge skb->dev while queued br_pass_frame_up() rewrites skb->dev from the ingress port to the bridge master before queueing bridge LOCAL_IN packets. NFQUEUE only holds references on state.in/out and bridge physdevs, so a queued bridge packet can retain a freed bridge master in skb->dev until reinjection. When the verdict is reinjected later, br_netif_receive_skb() re-enters the receive path with skb->dev still pointing at the freed bridge master, triggering a use-after-free. Store skb->dev in the queue entry, hold a reference on it for the queue lifetime, and use the saved device when dropping queued packets during NETDEV_DOWN handling.

Severity

7.8 (High)


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

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/950d809f154dca04e…
https://git.kernel.org/stable/c/a698ac8ab2561cf57…
https://git.kernel.org/stable/c/19924bdd8a45ebc72…
https://git.kernel.org/stable/c/1e5e20031c5eee8d2…
https://git.kernel.org/stable/c/3823c27099cfe2482…
https://git.kernel.org/stable/c/15d464265120ab981…
https://git.kernel.org/stable/c/3fb0f5c0f64162a8c…
https://git.kernel.org/stable/c/e196115ec330a18de…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ac28634456867b23b95faccba7997a62ec430603 , < 950d809f154dca04e5fbe5d3c8b9c5e44769cd57 (git) Affected: ac28634456867b23b95faccba7997a62ec430603 , < a698ac8ab2561cf575d2d9f34095032651dd952e (git) Affected: ac28634456867b23b95faccba7997a62ec430603 , < 19924bdd8a45ebc72a7b84c57fd63057d1dc75ac (git) Affected: ac28634456867b23b95faccba7997a62ec430603 , < 1e5e20031c5eee8d2e490a90ff4d6a2feecfc3be (git) Affected: ac28634456867b23b95faccba7997a62ec430603 , < 3823c27099cfe2482299065814adbaa771be9644 (git) Affected: ac28634456867b23b95faccba7997a62ec430603 , < 15d464265120ab9818bd673af301deee09bedab2 (git) Affected: ac28634456867b23b95faccba7997a62ec430603 , < 3fb0f5c0f64162a8c3f25616a4f1e340b921737f (git) Affected: ac28634456867b23b95faccba7997a62ec430603 , < e196115ec330a18de415bdb9f5071aa9f08e53ce (git)
Linux	Linux	Affected: 4.7 Unaffected: 0 , < 4.7 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (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 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/netfilter/nf_queue.h",
            "net/netfilter/nf_queue.c",
            "net/netfilter/nfnetlink_queue.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "950d809f154dca04e5fbe5d3c8b9c5e44769cd57",
              "status": "affected",
              "version": "ac28634456867b23b95faccba7997a62ec430603",
              "versionType": "git"
            },
            {
              "lessThan": "a698ac8ab2561cf575d2d9f34095032651dd952e",
              "status": "affected",
              "version": "ac28634456867b23b95faccba7997a62ec430603",
              "versionType": "git"
            },
            {
              "lessThan": "19924bdd8a45ebc72a7b84c57fd63057d1dc75ac",
              "status": "affected",
              "version": "ac28634456867b23b95faccba7997a62ec430603",
              "versionType": "git"
            },
            {
              "lessThan": "1e5e20031c5eee8d2e490a90ff4d6a2feecfc3be",
              "status": "affected",
              "version": "ac28634456867b23b95faccba7997a62ec430603",
              "versionType": "git"
            },
            {
              "lessThan": "3823c27099cfe2482299065814adbaa771be9644",
              "status": "affected",
              "version": "ac28634456867b23b95faccba7997a62ec430603",
              "versionType": "git"
            },
            {
              "lessThan": "15d464265120ab9818bd673af301deee09bedab2",
              "status": "affected",
              "version": "ac28634456867b23b95faccba7997a62ec430603",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "ac28634456867b23b95faccba7997a62ec430603",
              "versionType": "git"
            },
            {
              "lessThan": "e196115ec330a18de415bdb9f5071aa9f08e53ce",
              "status": "affected",
              "version": "ac28634456867b23b95faccba7997a62ec430603",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/net/netfilter/nf_queue.h",
            "net/netfilter/nf_queue.c",
            "net/netfilter/nfnetlink_queue.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.7"
            },
            {
              "lessThan": "4.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.259",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
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                  "vulnerable": true
                },
                {
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                {
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_queue: hold bridge skb-\u003edev while queued\n\nbr_pass_frame_up() rewrites skb-\u003edev from the ingress port to the bridge\nmaster before queueing bridge LOCAL_IN packets. NFQUEUE only holds\nreferences on state.in/out and bridge physdevs, so a queued bridge\npacket can retain a freed bridge master in skb-\u003edev until reinjection.\n\nWhen the verdict is reinjected later, br_netif_receive_skb() re-enters\nthe receive path with skb-\u003edev still pointing at the freed bridge master,\ntriggering a use-after-free.\n\nStore skb-\u003edev in the queue entry, hold a reference on it for the queue\nlifetime, and use the saved device when dropping queued packets during\nNETDEV_DOWN handling."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-28T06:36:30.468Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
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          "url": "https://git.kernel.org/stable/c/a698ac8ab2561cf575d2d9f34095032651dd952e"
        },
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          "url": "https://git.kernel.org/stable/c/19924bdd8a45ebc72a7b84c57fd63057d1dc75ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/1e5e20031c5eee8d2e490a90ff4d6a2feecfc3be"
        },
        {
          "url": "https://git.kernel.org/stable/c/3823c27099cfe2482299065814adbaa771be9644"
        },
        {
          "url": "https://git.kernel.org/stable/c/15d464265120ab9818bd673af301deee09bedab2"
        },
        {
          "url": "https://git.kernel.org/stable/c/3fb0f5c0f64162a8c3f25616a4f1e340b921737f"
        },
        {
          "url": "https://git.kernel.org/stable/c/e196115ec330a18de415bdb9f5071aa9f08e53ce"
        }
      ],
      "title": "netfilter: nf_queue: hold bridge skb-\u003edev while queued",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52912",
    "datePublished": "2026-06-24T07:14:10.583Z",
    "dateReserved": "2026-06-09T07:44:35.366Z",
    "dateUpdated": "2026-06-28T06:36:30.468Z",
    "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.

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GHSA-FFM7-9F73-PVMF

CVE-2026-52912 (GCVE-0-2026-52912)

Tags

Sightings

Nomenclature