Vulnerability-Lookup

FKIE_CVE-2026-64218

Vulnerability from fkie_nvd - Published: 2026-07-24 16:16 - Updated: 2026-08-11 18:26

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: fix report_work leak on backbone_gw purge batadv_bla_purge_backbone_gw() removes stale backbone gateway entries, but fails to properly handle their associated report_work: - If report_work is running, the purge must wait for it to finish before freeing the backbone_gw, otherwise the worker may access freed memory (e.g. bat_priv). - If report_work is pending, the purge must cancel it and release the reference held for that pending work item. The previous implementation called hlist_for_each_entry_safe() inside a spin_lock_bh() section, but cancel_work_sync() may sleep and therefore cannot be called from within a spinlock-protected region. Restructure the loop to handle one entry per spinlock critical section: acquire the lock, find the next entry to purge, remove it from the hash list, then release the lock before calling cancel_work_sync() and dropping the hash_entry reference. Repeat until no more entries require purging.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0459430add32ea41f3e2ef9351610e6d33627a6b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3423a45e5c3d3c5129f88143a9a969787d7d5a0a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/48663158222b3b7f6ee6791a67d512ede7fc94bb	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/95a7034661274cf5985708bd2f6d86ee46f88fa9	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c6de1a5a9c406e30b91f1515a6ce05cc84023baa	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ce2c0ee4d76d5ee4b391fe0e31334361e25030ec	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/eeddd7bab3d59c1e98642a204141f8c5d6194707	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f1303adb1e59582f76c22798a2e2e150e054a9e7	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1

JSON

To clipboard

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: fix report_work leak on backbone_gw purge\n\nbatadv_bla_purge_backbone_gw() removes stale backbone gateway entries,\nbut fails to properly handle their associated report_work:\n\n- If report_work is running, the purge must wait for it to finish before\n  freeing the backbone_gw, otherwise the worker may access freed memory\n  (e.g. bat_priv).\n- If report_work is pending, the purge must cancel it and release the\n  reference held for that pending work item.\n\nThe previous implementation called hlist_for_each_entry_safe() inside a\nspin_lock_bh() section, but cancel_work_sync() may sleep and therefore\ncannot be called from within a spinlock-protected region.\n\nRestructure the loop to handle one entry per spinlock critical section:\nacquire the lock, find the next entry to purge, remove it from the hash\nlist, then release the lock before calling cancel_work_sync() and\ndropping the hash_entry reference. Repeat until no more entries require\npurging."
    }
  ],
  "id": "CVE-2026-64218",
  "lastModified": "2026-08-11T18:26:37.047",
  "metrics": {
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      {
        "cvssData": {
          "attackComplexity": "LOW",
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          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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      "source": "nvd@nist.gov",
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}

CVE-2026-64218 (GCVE-0-2026-64218)

Vulnerability from cvelistv5 – Published: 2026-07-24 15:23 – Updated: 2026-08-05 12:40

Title

batman-adv: bla: fix report_work leak on backbone_gw purge

Summary

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 CNA under the mitre root

CNA scorecard D 53/100 over 7034 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/ce2c0ee4d76d5ee4b…
https://git.kernel.org/stable/c/3423a45e5c3d3c512…
https://git.kernel.org/stable/c/f1303adb1e59582f7…
https://git.kernel.org/stable/c/48663158222b3b7f6…
https://git.kernel.org/stable/c/eeddd7bab3d59c1e9…
https://git.kernel.org/stable/c/c6de1a5a9c406e30b…
https://git.kernel.org/stable/c/95a7034661274cf59…
https://git.kernel.org/stable/c/0459430add32ea41f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 23721387c409087fd3b97e274f34d3ddc0970b74 , < ce2c0ee4d76d5ee4b391fe0e31334361e25030ec (git) Affected: 23721387c409087fd3b97e274f34d3ddc0970b74 , < 3423a45e5c3d3c5129f88143a9a969787d7d5a0a (git) Affected: 23721387c409087fd3b97e274f34d3ddc0970b74 , < f1303adb1e59582f76c22798a2e2e150e054a9e7 (git) Affected: 23721387c409087fd3b97e274f34d3ddc0970b74 , < 48663158222b3b7f6ee6791a67d512ede7fc94bb (git) Affected: 23721387c409087fd3b97e274f34d3ddc0970b74 , < eeddd7bab3d59c1e98642a204141f8c5d6194707 (git) Affected: 23721387c409087fd3b97e274f34d3ddc0970b74 , < c6de1a5a9c406e30b91f1515a6ce05cc84023baa (git) Affected: 23721387c409087fd3b97e274f34d3ddc0970b74 , < 95a7034661274cf5985708bd2f6d86ee46f88fa9 (git) Affected: 23721387c409087fd3b97e274f34d3ddc0970b74 , < 0459430add32ea41f3e2ef9351610e6d33627a6b (git)
Linux	Linux	Affected: 3.5 Unaffected: 0 , < 3.5 (semver) Unaffected: 5.10.258 , ≤ 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)

Show details on NVD website

JSON

To clipboard

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                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "3.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "3.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.142",
                  "versionStartIncluding": "3.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.92",
                  "versionStartIncluding": "3.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "3.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "3.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "3.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: fix report_work leak on backbone_gw purge\n\nbatadv_bla_purge_backbone_gw() removes stale backbone gateway entries,\nbut fails to properly handle their associated report_work:\n\n- If report_work is running, the purge must wait for it to finish before\n  freeing the backbone_gw, otherwise the worker may access freed memory\n  (e.g. bat_priv).\n- If report_work is pending, the purge must cancel it and release the\n  reference held for that pending work item.\n\nThe previous implementation called hlist_for_each_entry_safe() inside a\nspin_lock_bh() section, but cancel_work_sync() may sleep and therefore\ncannot be called from within a spinlock-protected region.\n\nRestructure the loop to handle one entry per spinlock critical section:\nacquire the lock, find the next entry to purge, remove it from the hash\nlist, then release the lock before calling cancel_work_sync() and\ndropping the hash_entry reference. Repeat until no more entries require\npurging."
        }
      ],
      "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 - Although mesh packets can enqueue report_work, exploitation requires purging or tearing down the mesh object, which a local attacker can perform through netlink in a controlled network namespace.\nAC:L - The attacker can observe the periodic loop-detect address, enqueue many VLAN-specific work items, and immediately delete the interface, controlling both sides of the race.\nPR:L - Mesh configuration and teardown require CAP_NET_ADMIN, but batman-adv supports network namespaces and GENL_UNS_ADMIN_PERM, making the path reachable by an otherwise unprivileged user through user namespaces.\nUI:N - The attacker can create, trigger, and tear down the affected mesh interface without action from another user.\nS:U - Exploitation compromises the host kernel within its existing security authority; this is standard kernel privilege escalation rather than a VM or hardware-boundary escape.\nC:H - The worker can dereference a freed bat_priv, net_device, and embedded kobject; controlled reallocation can turn these stale pointer chains into kernel-memory disclosure primitives.\nI:H - The use-after-free reaches kobject uevent processing and stale callback-bearing structures, making heap reuse and control-flow hijacking or arbitrary kernel modification plausible.\nA:H - The stale net_device and kobject dereferences can cause a kernel oops or panic, and an attacker can repeat the trigger through user-namespace-created mesh interfaces."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:40:06.269Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ce2c0ee4d76d5ee4b391fe0e31334361e25030ec"
        },
        {
          "url": "https://git.kernel.org/stable/c/3423a45e5c3d3c5129f88143a9a969787d7d5a0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/f1303adb1e59582f76c22798a2e2e150e054a9e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/48663158222b3b7f6ee6791a67d512ede7fc94bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/eeddd7bab3d59c1e98642a204141f8c5d6194707"
        },
        {
          "url": "https://git.kernel.org/stable/c/c6de1a5a9c406e30b91f1515a6ce05cc84023baa"
        },
        {
          "url": "https://git.kernel.org/stable/c/95a7034661274cf5985708bd2f6d86ee46f88fa9"
        },
        {
          "url": "https://git.kernel.org/stable/c/0459430add32ea41f3e2ef9351610e6d33627a6b"
        }
      ],
      "title": "batman-adv: bla: fix report_work leak on backbone_gw purge",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64218",
    "datePublished": "2026-07-24T15:23:05.814Z",
    "dateReserved": "2026-07-19T15:36:31.770Z",
    "dateUpdated": "2026-08-05T12:40:06.269Z",
    "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.

Vulnerability timeline

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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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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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