{"id":"CVE-2026-74668","revision":"e5f418a780aa4c2b93774f230996ff7a","records":[{"revision":"e5f418a780aa4c2b93774f230996ff7a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74668","aliases":[],"title":"packet: use consistent hard_header_len in TX_RING send path","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npacket: use consistent hard_header_len in TX_RING send path\n\ntpacket_snd() reads dev->hard_header_len independently for skb\nallocation and header construction in tpacket_fill_skb(). Concurrent\nnetdevice reconfiguration can therefore make the reserved headroom\nsmaller than the amount later pushed, or make copylen - hard_header_len\nnegative.\n\nSnapshot hard_header_len once before processing ring frames and use it\nfor the frame limit, headroom allocation, copy length, and skb\nconstruction. Pass the snapshot to tpacket_fill_skb().\n\nThe separate SOCK_DGRAM consistency problem between hard_header_len and\nheader_ops->create is not addressed here.","state":0,"publishedAt":"2026-08-22T15:32:39.583+00:00","modifiedAt":"2026-10-16T19:16:08.423+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                        \"net/packet/af_packet.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1\",\n                            \"lessThan\": \"9c7e8ff48c377bef18c3d178748aea0575b69ede\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1\",\n                            \"lessThan\": \"2a73b2c37ee3060a880b53cd24783d93fc7be5f8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1\",\n                            \"lessThan\": \"e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1\",\n                            \"lessThan\": \"d85d2fd54e901637c81d847811e03c662aee13cd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1\",\n                            \"lessThan\": \"016763e829cac37b3234eace86fd0a4c560de4a7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1\",\n                            \"lessThan\": \"27e068d1b35dbec10a3cf268887c94407be4badc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1\",\n                            \"lessThan\": \"d48ea5c9c4c34dc0df621f0e39ed3a16b644621a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1\",\n                            \"lessThan\": \"21b5953e7494c16a42e6cd8cf110e18d13ae4a6b\",\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                        \"net/packet/af_packet.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.31\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.31\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.267\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.218\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.185\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.152\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.104\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.45\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.9\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\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:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/9c7e8ff48c377bef18c3d178748aea0575b69ede","https://git.kernel.org/stable/c/2a73b2c37ee3060a880b53cd24783d93fc7be5f8","https://git.kernel.org/stable/c/e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2","https://git.kernel.org/stable/c/d85d2fd54e901637c81d847811e03c662aee13cd","https://git.kernel.org/stable/c/016763e829cac37b3234eace86fd0a4c560de4a7","https://git.kernel.org/stable/c/27e068d1b35dbec10a3cf268887c94407be4badc","https://git.kernel.org/stable/c/d48ea5c9c4c34dc0df621f0e39ed3a16b644621a","https://git.kernel.org/stable/c/21b5953e7494c16a42e6cd8cf110e18d13ae4a6b"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74668","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74668","identifiers":["CVE-2026-74668"]},"retained":false,"historicalAffected":[]}],"coverage":[]}