CVE-2026-64537

{"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bridge/br_cfm.c", "net/bridge/br_cfm_netlink.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2870056a78961e0fecd652362ee9d3fcfd24a8a6", "status": "affected", "version": "2be665c3940d367e0a2a8128eb4985ce323f99a3", "versionType": "git"}, {"lessThan": "f0f5eb59a97ece0d85de8cfa95dc18c609302a8b", "status": "affected", "version": "2be665c3940d367e0a2a8128eb4985ce323f99a3", "versionType": "git"}, {"lessThan": "53788b134519e995699ea3721969c96a08d64575", "status": "affected", "version": "2be665c3940d367e0a2a8128eb4985ce323f99a3", "versionType": "git"}, {"lessThan": "b42aeb58317f12024734759ff745856b53948873", "status": "affected", "version": "2be665c3940d367e0a2a8128eb4985ce323f99a3", "versionType": "git"}, {"lessThan": "a090880c1f544589427e5b7050c40fb211ccecb4", "status": "affected", "version": "2be665c3940d367e0a2a8128eb4985ce323f99a3", "versionType": "git"}, {"lessThan": "865643640b5b5c4579b32d7a55ac9ad648362eaa", "status": "affected", "version": "2be665c3940d367e0a2a8128eb4985ce323f99a3", "versionType": "git"}, {"lessThan": "f3e02edd8322b31b8e6517faa6ba053bf29d1e26", "status": "affected", "version": "2be665c3940d367e0a2a8128eb4985ce323f99a3", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bridge/br_cfm.c", "net/bridge/br_cfm_netlink.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.11"}, {"lessThan": "5.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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)."}], "id": "CVE-2026-64537", "lastModified": "2026-11-03T18:15:39.353", "metrics": {}, "published": "2026-07-27T21:17:05.987", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2870056a78961e0fecd652362ee9d3fcfd24a8a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/53788b134519e995699ea3721969c96a08d64575"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/865643640b5b5c4579b32d7a55ac9ad648362eaa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a090880c1f544589427e5b7050c40fb211ccecb4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b42aeb58317f12024734759ff745856b53948873"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f0f5eb59a97ece0d85de8cfa95dc18c609302a8b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f3e02edd8322b31b8e6517faa6ba053bf29d1e26"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: bridge: cfm: reject invalid CCM interval at configuration time", "id": "2507777", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507777"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-835", "details": ["No description is available for this CVE."], "name": "CVE-2026-64537", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64537\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64537\nhttps://lore.kernel.org/linux-cve-announce/2026072735-CVE-2026-64537-eff0@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2be665c3940d367e0a2a8128eb4985ce323f99a3,2870056a78961e0fecd652362ee9d3fcfd24a8a6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2be665c3940d367e0a2a8128eb4985ce323f99a3,f0f5eb59a97ece0d85de8cfa95dc18c609302a8b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2be665c3940d367e0a2a8128eb4985ce323f99a3,53788b134519e995699ea3721969c96a08d64575)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2be665c3940d367e0a2a8128eb4985ce323f99a3,b42aeb58317f12024734759ff745856b53948873)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2be665c3940d367e0a2a8128eb4985ce323f99a3,a090880c1f544589427e5b7050c40fb211ccecb4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2be665c3940d367e0a2a8128eb4985ce323f99a3,865643640b5b5c4579b32d7a55ac9ad648362eaa)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2be665c3940d367e0a2a8128eb4985ce323f99a3,f3e02edd8322b31b8e6517faa6ba053bf29d1e26)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-28T04:45:17.539307+00:00", "updated": "2026-08-05T00:15:04.484795+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}