{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64537","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T15:36:31.795Z","datePublished":"2026-07-27T20:10:32.210Z","dateUpdated":"2026-08-17T04:57:13.368Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T04:57:13.368Z"},"descriptions":[{"lang":"en","value":"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)."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/br_cfm.c","net/bridge/br_cfm_netlink.c"],"versions":[{"version":"2be665c3940d367e0a2a8128eb4985ce323f99a3","lessThan":"2870056a78961e0fecd652362ee9d3fcfd24a8a6","status":"affected","versionType":"git"},{"version":"2be665c3940d367e0a2a8128eb4985ce323f99a3","lessThan":"f0f5eb59a97ece0d85de8cfa95dc18c609302a8b","status":"affected","versionType":"git"},{"version":"2be665c3940d367e0a2a8128eb4985ce323f99a3","lessThan":"53788b134519e995699ea3721969c96a08d64575","status":"affected","versionType":"git"},{"version":"2be665c3940d367e0a2a8128eb4985ce323f99a3","lessThan":"b42aeb58317f12024734759ff745856b53948873","status":"affected","versionType":"git"},{"version":"2be665c3940d367e0a2a8128eb4985ce323f99a3","lessThan":"a090880c1f544589427e5b7050c40fb211ccecb4","status":"affected","versionType":"git"},{"version":"2be665c3940d367e0a2a8128eb4985ce323f99a3","lessThan":"865643640b5b5c4579b32d7a55ac9ad648362eaa","status":"affected","versionType":"git"},{"version":"2be665c3940d367e0a2a8128eb4985ce323f99a3","lessThan":"f3e02edd8322b31b8e6517faa6ba053bf29d1e26","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/br_cfm.c","net/bridge/br_cfm_netlink.c"],"versions":[{"version":"5.11","status":"affected"},{"version":"0","lessThan":"5.11","status":"unaffected","versionType":"semver"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/2870056a78961e0fecd652362ee9d3fcfd24a8a6"},{"url":"https://git.kernel.org/stable/c/f0f5eb59a97ece0d85de8cfa95dc18c609302a8b"},{"url":"https://git.kernel.org/stable/c/53788b134519e995699ea3721969c96a08d64575"},{"url":"https://git.kernel.org/stable/c/b42aeb58317f12024734759ff745856b53948873"},{"url":"https://git.kernel.org/stable/c/a090880c1f544589427e5b7050c40fb211ccecb4"},{"url":"https://git.kernel.org/stable/c/865643640b5b5c4579b32d7a55ac9ad648362eaa"},{"url":"https://git.kernel.org/stable/c/f3e02edd8322b31b8e6517faa6ba053bf29d1e26"}],"title":"bridge: cfm: reject invalid CCM interval at configuration time","x_generator":{"engine":"bippy-1.2.0"}}}}