{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "23721387c409087fd3b97e274f34d3ddc0970b74"
            },
            {
              "fixed": "844a95a734f178d56c7acce14c5cce2cecff7e1a"
            },
            {
              "fixed": "baeb1a28fd8e2f68193650d3664a8cd1adfd85c6"
            },
            {
              "fixed": "aacffa780a37e06cd5a13d33740a6e96c3a67e6c"
            },
            {
              "fixed": "76aedcde5a2489cc971d4d1e396e784a49565e96"
            },
            {
              "fixed": "f50edb69082a8ba990cc23d642089829f99afe6a"
            },
            {
              "fixed": "871acdf97f64cee8398f72b88b89e8b4f4816dbe"
            },
            {
              "fixed": "9a0c47023d3254048a1588534755d4476bcc3abc"
            },
            {
              "fixed": "8d128c932bced74e3b1625ba3d7c78ef122a88a7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.5.0"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89948.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: fix freeing of claims on meshif deletion\n\nWhen the mesh interface is getting deleted, then\nbatadv_bla_del_backbone_claims() (via batadv_bla_purge_backbone_gw()) could\nmake sure that all claims gets removed. But this function is only executed\nwhen bat_priv-\u003ebla.claim_hash is not NULL. And since batadv_bla_free() is\nalways setting it to NULL before it is (indirectly) called, it was never\nactually executed.\n\nBut the batadv_bla_purge_claims() -\u003e batadv_handle_unclaim() is at the\nmoment too fragile because the BLA code is not handling the rehashing in\nbatadv_bla_update_orig_address(). The stored backbone address doesn't have\nto be the one actually used for the hash bucket selection during the\ninitial adding of the backbone. The batadv_handle_unclaim() can therefore\nfail to find the respective backbone for the unclaim and then stop the\ndeletion.\n\nBut the actual backbone_gw object is not needed for the unclaim because all\nrelevant information is always provided by the caller. And the check for\nthe existence of the backbone_gw doesn't provide any additional security\ncheck for the deletion of a claim.",
  "id": "CVE-2026-89948",
  "modified": "2026-09-18T03:30:58.087093639Z",
  "published": "2026-09-16T10:32:34.089Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/76aedcde5a2489cc971d4d1e396e784a49565e96"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/844a95a734f178d56c7acce14c5cce2cecff7e1a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/871acdf97f64cee8398f72b88b89e8b4f4816dbe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d128c932bced74e3b1625ba3d7c78ef122a88a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a0c47023d3254048a1588534755d4476bcc3abc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aacffa780a37e06cd5a13d33740a6e96c3a67e6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/baeb1a28fd8e2f68193650d3664a8cd1adfd85c6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f50edb69082a8ba990cc23d642089829f99afe6a"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89948.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89948"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "batman-adv: bla: fix freeing of claims on meshif deletion"
}