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

Vulnerability from cvelistv5 – Published: 2026-07-24 15:23 – Updated: 2026-08-05 12:40
VLAI
Title
batman-adv: bla: fix report_work leak on backbone_gw purge
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
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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)
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        "id": "CVE-2026-64218",
        "lastModified": "2026-08-11T18:26:37.047",
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              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-07-24T16:16:49.520",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/0459430add32ea41f3e2ef9351610e6d33627a6b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/3423a45e5c3d3c5129f88143a9a969787d7d5a0a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/48663158222b3b7f6ee6791a67d512ede7fc94bb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/95a7034661274cf5985708bd2f6d86ee46f88fa9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c6de1a5a9c406e30b91f1515a6ce05cc84023baa"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ce2c0ee4d76d5ee4b391fe0e31334361e25030ec"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/eeddd7bab3d59c1e98642a204141f8c5d6194707"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f1303adb1e59582f76c22798a2e2e150e054a9e7"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-14T18:09:49+00:00",
      "cve": "CVE-2026-64218",
      "id": "CVE-2026-64218",
      "initial_release_date": "2026-07-24T00:00:00+00:00",
      "product_status:known_affected": "4",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: batman-adv: bla: fix report_work leak on backbone_gw purge",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64218.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:42:52Z",
      "cve": "CVE-2026-64218",
      "id": "CVE-2026-64218",
      "initial_release_date": "2026-07-25T00:14:20Z",
      "product_status:known_affected": "700",
      "product_status:known_not_affected": "33",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64218",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64218.json",
      "version": "11"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


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.