Vulnerability-Lookup

GHSA-M3G3-FF8F-V2GJ

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

net: sparx5: unregister blocking notifier on init failure

sparx5_register_notifier_blocks() registers the switchdev blocking notifier before allocating the ordered workqueue. If the workqueue allocation fails, the error path unregisters the switchdev and netdevice notifiers, but leaves the blocking notifier registered.

Add a separate error label for the workqueue allocation failure path and unregister the switchdev blocking notifier there.

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-2026-72109"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:25Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sparx5: unregister blocking notifier on init failure\n\nsparx5_register_notifier_blocks() registers the switchdev blocking\nnotifier before allocating the ordered workqueue. If the workqueue\nallocation fails, the error path unregisters the switchdev and netdevice\nnotifiers, but leaves the blocking notifier registered.\n\nAdd a separate error label for the workqueue allocation failure path and\nunregister the switchdev blocking notifier there.",
  "id": "GHSA-m3g3-ff8f-v2gj",
  "modified": "2026-08-17T06:33:10Z",
  "published": "2026-08-15T06:32:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72109"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/17f113e7b622dc850992ade540181717de6a8561"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/483be61b4a9a6df3b7cb277e8f189e082dee4cb8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a3c44a003176282ee4306b7c96e5a536c6f0707"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf419c869e0d03aad4b6f4ecf0a813851930dfe7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d6084c47389fd6978a5d66b0d58206a548c792a9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e5afc6d3fabdf1f605d63c4b34a3df6c359e81f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbc65b17508ed5464b7106e7fa5f15251ca1b603"
    }
  ],
  "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-2026-72109 (GCVE-0-2026-72109)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-17 05:40

Title

net: sparx5: unregister blocking notifier on init failure

Summary

In the Linux kernel, the following vulnerability has been resolved: net: sparx5: unregister blocking notifier on init failure sparx5_register_notifier_blocks() registers the switchdev blocking notifier before allocating the ordered workqueue. If the workqueue allocation fails, the error path unregisters the switchdev and netdevice notifiers, but leaves the blocking notifier registered. Add a separate error label for the workqueue allocation failure path and unregister the switchdev blocking notifier there.

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 mitre root Scorecard

References

7 references

URL	Tags
https://git.kernel.org/stable/c/fbc65b17508ed5464…
https://git.kernel.org/stable/c/e5afc6d3fabdf1f60…
https://git.kernel.org/stable/c/cf419c869e0d03aad…
https://git.kernel.org/stable/c/d6084c47389fd6978…
https://git.kernel.org/stable/c/8a3c44a003176282e…
https://git.kernel.org/stable/c/17f113e7b622dc850…
https://git.kernel.org/stable/c/483be61b4a9a6df3b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d6fce5141929697a27f029c633433d487f6f62cb , < fbc65b17508ed5464b7106e7fa5f15251ca1b603 (git) Affected: d6fce5141929697a27f029c633433d487f6f62cb , < e5afc6d3fabdf1f605d63c4b34a3df6c359e81f3 (git) Affected: d6fce5141929697a27f029c633433d487f6f62cb , < cf419c869e0d03aad4b6f4ecf0a813851930dfe7 (git) Affected: d6fce5141929697a27f029c633433d487f6f62cb , < d6084c47389fd6978a5d66b0d58206a548c792a9 (git) Affected: d6fce5141929697a27f029c633433d487f6f62cb , < 8a3c44a003176282ee4306b7c96e5a536c6f0707 (git) Affected: d6fce5141929697a27f029c633433d487f6f62cb , < 17f113e7b622dc850992ade540181717de6a8561 (git) Affected: d6fce5141929697a27f029c633433d487f6f62cb , < 483be61b4a9a6df3b7cb277e8f189e082dee4cb8 (git)
Linux	Linux	Affected: 5.14 Unaffected: 0 , < 5.14 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/microchip/sparx5/sparx5_switchdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fbc65b17508ed5464b7106e7fa5f15251ca1b603",
              "status": "affected",
              "version": "d6fce5141929697a27f029c633433d487f6f62cb",
              "versionType": "git"
            },
            {
              "lessThan": "e5afc6d3fabdf1f605d63c4b34a3df6c359e81f3",
              "status": "affected",
              "version": "d6fce5141929697a27f029c633433d487f6f62cb",
              "versionType": "git"
            },
            {
              "lessThan": "cf419c869e0d03aad4b6f4ecf0a813851930dfe7",
              "status": "affected",
              "version": "d6fce5141929697a27f029c633433d487f6f62cb",
              "versionType": "git"
            },
            {
              "lessThan": "d6084c47389fd6978a5d66b0d58206a548c792a9",
              "status": "affected",
              "version": "d6fce5141929697a27f029c633433d487f6f62cb",
              "versionType": "git"
            },
            {
              "lessThan": "8a3c44a003176282ee4306b7c96e5a536c6f0707",
              "status": "affected",
              "version": "d6fce5141929697a27f029c633433d487f6f62cb",
              "versionType": "git"
            },
            {
              "lessThan": "17f113e7b622dc850992ade540181717de6a8561",
              "status": "affected",
              "version": "d6fce5141929697a27f029c633433d487f6f62cb",
              "versionType": "git"
            },
            {
              "lessThan": "483be61b4a9a6df3b7cb277e8f189e082dee4cb8",
              "status": "affected",
              "version": "d6fce5141929697a27f029c633433d487f6f62cb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/microchip/sparx5/sparx5_switchdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "5.14",
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                },
                {
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                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                }
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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: sparx5: unregister blocking notifier on init failure\n\nsparx5_register_notifier_blocks() registers the switchdev blocking\nnotifier before allocating the ordered workqueue. If the workqueue\nallocation fails, the error path unregisters the switchdev and netdevice\nnotifiers, but leaves the blocking notifier registered.\n\nAdd a separate error label for the workqueue allocation failure path and\nunregister the switchdev blocking notifier there."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation reaches sparx5_switchdev_blocking_event through global switchdev blocking notifier callbacks fired by local bridge/VLAN/MDB configuration via rtnetlink, not by processing remote packets on Sparx5 switch ports.\nAC:L - After a sparx5 probe workqueue ENOMEM leaves the blocking notifier registered and devm frees sparx5, an attacker can reliably trigger call_switchdev_blocking_notifiers with ordinary bridge or VLAN netlink operations without uncontrollable races.\nPR:L - Triggering switchdev blocking events requires CAP_NET_ADMIN for bridge/VLAN changes; unprivileged users can obtain that capability in user/network namespaces and invoke the global notifier chain from their own bridge configuration.\nUI:N - No victim interaction is required beyond the attacker performing network administration operations; no user must open files, mount filesystems, or click anything to reach the stale notifier callback.\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority on Sparx5/LAN969x switch platforms, enabling local privilege escalation but not VM escape or other cross-authority boundary bypass by itself.\nC:H - The leaked switchdev_blocking_nb remains on a global chain after devm frees the containing sparx5 structure; sparx5_switchdev_blocking_event dereferences it via container_of, creating a use-after-free that can disclose kernel memory.\nI:H - UAF callbacks such as sparx5_handle_port_vlan_add and MDB handlers dereference freed sparx5 state and can write through sparx5_mact_learn and related hardware programming, enabling memory corruption and potential arbitrary code execution.\nA:H - Dereferencing freed notifier_block and sparx5 structures during global switchdev blocking events can cause kernel oops, panic, or hang, disrupting availability on enterprise, industrial, and automotive Sparx5-managed switch systems."
            }
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        }
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        "dateUpdated": "2026-08-17T05:40:22.667Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/8a3c44a003176282ee4306b7c96e5a536c6f0707"
        },
        {
          "url": "https://git.kernel.org/stable/c/17f113e7b622dc850992ade540181717de6a8561"
        },
        {
          "url": "https://git.kernel.org/stable/c/483be61b4a9a6df3b7cb277e8f189e082dee4cb8"
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      "title": "net: sparx5: unregister blocking notifier on init failure",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72109",
    "datePublished": "2026-08-15T05:52:51.067Z",
    "dateReserved": "2026-08-09T03:40:39.906Z",
    "dateUpdated": "2026-08-17T05:40:22.667Z",
    "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-M3G3-FF8F-V2GJ

CVE-2026-72109 (GCVE-0-2026-72109)

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