{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "23721387c409087fd3b97e274f34d3ddc0970b74"
            },
            {
              "fixed": "1f013bc94154f2e78e97d0296175664224c796e0"
            },
            {
              "fixed": "5328b95960774f2e189f22485616bc7b8eb2f7e3"
            },
            {
              "fixed": "8ff9c59d1b7b48c2596878341a5310f32895d52b"
            },
            {
              "fixed": "a9393751ecf7e9096f93cb6eed02db4f79125765"
            },
            {
              "fixed": "461f1e3dfb888701895b766446c55db2b10db705"
            },
            {
              "fixed": "45384612f29692fbf0c770200361a7acff90125c"
            },
            {
              "fixed": "65497ad155a3246df177b5ef662cd6e5a32cb470"
            },
            {
              "fixed": "83ab69bd12b80f6ea169c8bea6977701b53a043d"
            }
          ],
          "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": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.93"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.34"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64095.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: avoid double decrement of bla.num_requests\n\nThe bla.num_requests is increased when no request_sent was in progress. And\nit is decremented in various places (announcement was received, backbone is\npurged, periodic work). But the check if the request_sent is actually set\nto a specific state and the atomic_dec/_inc are not safe because they are\nnot atomic (TOCTOU) and multiple such code portions can run concurrently.\n\nAt the same time, it is necessary to modify request_sent (state) and\nbla.num_requests atomically. Otherwise batadv_bla_send_request() might set\nrequest_sent to 1 and is interrupted.  batadv_handle_announce() can then\nset request_sent back to 0 and decrement num_requests before\nbatadv_bla_send_request() incremented it.\n\nThe two operations must therefore be locked. And since state (request_sent)\nand wait_periods are only accessed inside this lock, they can be converted\nto simpler datatypes. And to avoid that the bla.num_requests is touched by\na parallel running context with a valid backbone_gw reference after\nbatadv_bla_purge_backbone_gw() ran, a third state \"stopped\" is required to\ncorrectly signal that a backbone_gw is in the state of being cleaned up.",
  "id": "CVE-2026-64095",
  "modified": "2026-08-13T03:51:50.997584818Z",
  "published": "2026-07-19T15:40:02.360Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f013bc94154f2e78e97d0296175664224c796e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45384612f29692fbf0c770200361a7acff90125c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/461f1e3dfb888701895b766446c55db2b10db705"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5328b95960774f2e189f22485616bc7b8eb2f7e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65497ad155a3246df177b5ef662cd6e5a32cb470"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83ab69bd12b80f6ea169c8bea6977701b53a043d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ff9c59d1b7b48c2596878341a5310f32895d52b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9393751ecf7e9096f93cb6eed02db4f79125765"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64095.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64095"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "batman-adv: bla: avoid double decrement of bla.num_requests"
}