{"id":"CVE-2026-64034","revision":"799b6c344cb14aa38bc351f5c2a819ff","records":[{"revision":"799b6c344cb14aa38bc351f5c2a819ff","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64034","aliases":[],"title":"net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer\n\nIn mana_hwc_rx_event_handler(), resp->response.hwc_msg_id is read from\nDMA-coherent memory and bounds-checked, then mana_hwc_handle_resp()\nre-reads the same field from the same DMA buffer for test_bit() and\npointer arithmetic.\n\nDMA-coherent memory is mapped uncacheable on x86 and is shared,\nunencrypted, in Confidential VMs (SEV-SNP/TDX), so each load goes\ndirectly to host-visible memory. A H/W can modify the value\nbetween the check and the use, bypassing the bounds validation.\n\nFix this by reading hwc_msg_id exactly once using READ_ONCE() into a\nstack-local variable in mana_hwc_rx_event_handler(), and passing the\nvalidated value as a parameter to mana_hwc_handle_resp().","state":0,"publishedAt":"2026-07-19T15:39:23.47+00:00","modifiedAt":"2026-10-19T20:28:09.897+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ethernet/microsoft/mana/hw_channel.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f\",\n                            \"lessThan\": \"a201c66edf2ebc6cfdc3813a889ba20fecebfae3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f\",\n                            \"lessThan\": \"70ad2dff8d052a85dfef15715b531f38a29108cf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f\",\n                            \"lessThan\": \"566f42fb67a7ebfed6650e407e5b72e6b3e83bf7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f\",\n                            \"lessThan\": \"6180a06bbc99fd9114b8db4be6c4d46e40f046ef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f\",\n                            \"lessThan\": \"09ec063d87c2dd3fa6f3561361a017bd882e9f37\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f\",\n                            \"lessThan\": \"3c4db56ccd13dd020fbf43afabaee74a40ec75e4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f\",\n                            \"lessThan\": \"35f0f0a2536a4d604b4dbad92c85c4a8fdebb870\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ethernet/microsoft/mana/hw_channel.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.209\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.142\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.92\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.34\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.11\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":9.3,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/a201c66edf2ebc6cfdc3813a889ba20fecebfae3","https://git.kernel.org/stable/c/70ad2dff8d052a85dfef15715b531f38a29108cf","https://git.kernel.org/stable/c/566f42fb67a7ebfed6650e407e5b72e6b3e83bf7","https://git.kernel.org/stable/c/6180a06bbc99fd9114b8db4be6c4d46e40f046ef","https://git.kernel.org/stable/c/09ec063d87c2dd3fa6f3561361a017bd882e9f37","https://git.kernel.org/stable/c/3c4db56ccd13dd020fbf43afabaee74a40ec75e4","https://git.kernel.org/stable/c/35f0f0a2536a4d604b4dbad92c85c4a8fdebb870"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64034","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64034","identifiers":["CVE-2026-64034"]},"retained":false,"historicalAffected":[]}],"coverage":[]}