{"id":"CVE-2026-64537","summary":"bridge: cfm: reject invalid CCM interval at configuration time","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).","modified":"2026-08-18T03:31:20.445606538Z","published":"2026-07-27T20:10:32.210Z","related":["openSUSE-SU-2026:11476-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64537.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2be665c3940d367e0a2a8128eb4985ce323f99a3"},{"fixed":"2870056a78961e0fecd652362ee9d3fcfd24a8a6"},{"fixed":"f0f5eb59a97ece0d85de8cfa95dc18c609302a8b"},{"fixed":"53788b134519e995699ea3721969c96a08d64575"},{"fixed":"b42aeb58317f12024734759ff745856b53948873"},{"fixed":"a090880c1f544589427e5b7050c40fb211ccecb4"},{"fixed":"865643640b5b5c4579b32d7a55ac9ad648362eaa"},{"fixed":"f3e02edd8322b31b8e6517faa6ba053bf29d1e26"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64537.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","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"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64537.json"}}],"schema_version":"1.9.0"}