{"id":"CVE-2026-99066","revision":"b0834e3750f040548b6ea2fe3bf5b53a","records":[{"revision":"b0834e3750f040548b6ea2fe3bf5b53a","observedAt":"2026-10-23T16:01:20.601+00:00","statement":{"source":"cve-program","id":"CVE-2026-99066","aliases":[],"title":"can: dev: init_can_skb(): restore skb header initialization","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: dev: init_can_skb(): restore skb header initialization\n\nCommit 9f10374bb024 (\"can: remove private CAN skb headroom infrastructure\")\nremoved the skb_reset_mac_header()/skb_reset_network_header()/\nskb_reset_transport_header() calls from init_can_skb(). As a result, RX\nskbs from alloc_can_skb() and friends again carry mac_header = 0xFFFF.\nWhen such an skb reaches packet_rcv_spkt() (SOCK_PACKET), the push length\ncalculation overflows and triggers skb_under_panic -> kernel BUG -> full\nmachine panic.\n\nThe same issue was originally reported in 2014 on linux-can and fixed by\ncommit 969439016d2c (\"can: add missing initialisations in CAN related\nskbuffs\"). packet_rcv_spkt() itself has never been hardened: only\npacket_rcv() and tpacket_rcv() gained dev_has_header() checks in\ncommit d549699048b4 (\"net/packet: fix packet receive on L3 devices\nwithout visible hard header\").","state":0,"publishedAt":"2026-10-23T12:23:09.516+00:00","modifiedAt":"2026-10-23T12:23:09.516+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/can/dev/skb.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"9f10374bb024593a611e6845847f0444841a231b\",\n                            \"lessThan\": \"8078375dfd0baecd9f1b7b06bb2d6f88d7cb8632\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9f10374bb024593a611e6845847f0444841a231b\",\n                            \"lessThan\": \"0a04c0cb8606ff88399489d03ef255afe90d0d5f\",\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/can/dev/skb.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"7.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.11\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/8078375dfd0baecd9f1b7b06bb2d6f88d7cb8632","https://git.kernel.org/stable/c/0a04c0cb8606ff88399489d03ef255afe90d0d5f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99066","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-99066","identifiers":["CVE-2026-99066"]},"retained":false,"historicalAffected":[]}],"coverage":[]}