{"id":"CVE-2026-74582","revision":"f12b0fbf1f6d48f394c9e01c86c72f54","records":[{"revision":"f12b0fbf1f6d48f394c9e01c86c72f54","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74582","aliases":[],"title":"packet: use consistent hard_header_len in non-ring send paths","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npacket: use consistent hard_header_len in non-ring send paths\n\npacket_snd() reads dev->hard_header_len multiple times while allocating\nand constructing an skb. Device reconfiguration can change this value\nconcurrently, for example through bonding device type changes.\n\nFor SOCK_RAW, packet_snd() can save a larger value in reserve and later\nallocate headroom using a smaller value. Moving skb->data back by reserve\nthen places it before skb->head, and the following copy from userspace can\nattempt an out-of-bounds write.\n\npacket_sendmsg_spkt() has the same issue because it calculates its\nreservation and header offset from separate reads before dropping the RCU\nread lock to allocate the skb.\n\nAdd LL_RESERVED_SPACE_EX() for callers that already saved a header length.\nRead hard_header_len once in packet_snd() and use it for allocation and\nconstruction. In packet_sendmsg_spkt(), preserve the allocation-time value\nthrough the device lookup retry.\n\nThe separate SOCK_DGRAM consistency problem between hard_header_len and\nheader_ops->create is not addressed here.","state":0,"publishedAt":"2026-08-21T16:31:55.283+00:00","modifiedAt":"2026-10-16T19:05:58.23+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                        \"include/linux/netdevice.h\",\n                        \"net/packet/af_packet.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba\",\n                            \"lessThan\": \"bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba\",\n                            \"lessThan\": \"78a47127e33c340bc6d38dcc4552a094b4f5cc77\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba\",\n                            \"lessThan\": \"142e287b3a25cfe909215177c23243e7fc5ae2b1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba\",\n                            \"lessThan\": \"91f041451f967cd87ed722a8f43c0b767a64f1a0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba\",\n                            \"lessThan\": \"9052756290962ffb9a661bcf319e92dedaaedfed\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba\",\n                            \"lessThan\": \"5bb10753d428aadfc356a2bfe9acea09c82a62ec\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba\",\n                            \"lessThan\": \"b06b6fce6d7deaf7238e09b48ce3b1125ff41acd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba\",\n                            \"lessThan\": \"03390aa32e669cc4ecd7d34108e2e1afc13d689d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d9fb8cc230b2a4757e9fe4f81468f81212d4deaa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6190cce26e40bf71c4d375b21eea74bb07b6a0f3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"01a658c1b9d4b5393c38d5a92d9112ab1425382a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8809ae6747e760e6f1d2453ceb08c9bcc4939766\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4.4.133\",\n                            \"lessThan\": \"4.5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"4.9.103\",\n                            \"lessThan\": \"4.10\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"4.14.44\",\n                            \"lessThan\": \"4.15\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"4.16.12\",\n                            \"lessThan\": \"4.17\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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                        \"include/linux/netdevice.h\",\n                        \"net/packet/af_packet.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.17\",\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/bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812","https://git.kernel.org/stable/c/78a47127e33c340bc6d38dcc4552a094b4f5cc77","https://git.kernel.org/stable/c/142e287b3a25cfe909215177c23243e7fc5ae2b1","https://git.kernel.org/stable/c/91f041451f967cd87ed722a8f43c0b767a64f1a0","https://git.kernel.org/stable/c/9052756290962ffb9a661bcf319e92dedaaedfed","https://git.kernel.org/stable/c/5bb10753d428aadfc356a2bfe9acea09c82a62ec","https://git.kernel.org/stable/c/b06b6fce6d7deaf7238e09b48ce3b1125ff41acd","https://git.kernel.org/stable/c/03390aa32e669cc4ecd7d34108e2e1afc13d689d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74582","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74582","identifiers":["CVE-2026-74582"]},"retained":false,"historicalAffected":[]}],"coverage":[]}