{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "2be665c3940d367e0a2a8128eb4985ce323f99a3"
            },
            {
              "fixed": "2870056a78961e0fecd652362ee9d3fcfd24a8a6"
            },
            {
              "fixed": "f0f5eb59a97ece0d85de8cfa95dc18c609302a8b"
            },
            {
              "fixed": "53788b134519e995699ea3721969c96a08d64575"
            },
            {
              "fixed": "b42aeb58317f12024734759ff745856b53948873"
            },
            {
              "fixed": "a090880c1f544589427e5b7050c40fb211ccecb4"
            },
            {
              "fixed": "865643640b5b5c4579b32d7a55ac9ad648362eaa"
            },
            {
              "fixed": "f3e02edd8322b31b8e6517faa6ba053bf29d1e26"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64537.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbridge: cfm: reject invalid CCM interval at configuration time\n\nccm_tx_work_expired() re-arms itself via queue_delayed_work() using\nthe configured exp_interval converted by interval_to_us(). When\nexp_interval is BR_CFM_CCM_INTERVAL_NONE or out of range,\ninterval_to_us() returns 0, causing the worker to fire immediately in\na tight loop that allocates skbs until OOM.\n\nFix this by validating exp_interval at configuration time:\n\n - Constrain IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL to the valid range\n   [BR_CFM_CCM_INTERVAL_3_3_MS, BR_CFM_CCM_INTERVAL_10_MIN] in the\n   netlink policy so userspace cannot set an invalid value.\n\n - Reject starting CCM TX in br_cfm_cc_ccm_tx() when exp_interval has\n   not yet been configured (defaults to 0 from kzalloc).",
  "id": "CVE-2026-64537",
  "modified": "2026-08-18T03:31:20.445606538Z",
  "published": "2026-07-27T20:10:32.210Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2870056a78961e0fecd652362ee9d3fcfd24a8a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53788b134519e995699ea3721969c96a08d64575"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/865643640b5b5c4579b32d7a55ac9ad648362eaa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a090880c1f544589427e5b7050c40fb211ccecb4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b42aeb58317f12024734759ff745856b53948873"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f0f5eb59a97ece0d85de8cfa95dc18c609302a8b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f3e02edd8322b31b8e6517faa6ba053bf29d1e26"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64537.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64537"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "bridge: cfm: reject invalid CCM interval at configuration time"
}