{"id":"CVE-2026-72019","revision":"2f214ec68c4c437a9ac214328e29a307","records":[{"revision":"2f214ec68c4c437a9ac214328e29a307","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72019","aliases":[],"title":"macsec: don't read an unset MAC header in macsec_encrypt()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmacsec: don't read an unset MAC header in macsec_encrypt()\n\nmacsec_encrypt() reads the Ethernet header via eth_hdr(skb)\n(skb->head + skb->mac_header) to memmove() the 12 source/destination MAC\nbytes forward and make room for the SecTAG.\n\nOn the AF_PACKET SOCK_RAW + PACKET_QDISC_BYPASS transmit path the skb\nreaches the macsec ndo_start_xmit() with the MAC header unset, so\neth_hdr(skb) resolves to skb->head + (u16)~0 and the read is out of\nbounds: a 12-byte heap over-read that is also emitted on the wire as the\nframe's outer source/destination MAC. KASAN reports a slab-out-of-bounds\nread in macsec_start_xmit() on 6.0; on current mainline a CONFIG_DEBUG_NET\nbuild flags it as an unset mac header in skb_mac_header().\n\nOn the TX path the L2 header is at skb->data, so use skb_eth_hdr(), added\nby commit 96cc4b69581d (\"macvlan: do not assume mac_header is set in\nmacvlan_broadcast()\") for exactly this purpose.","state":0,"publishedAt":"2026-08-15T05:51:46.014+00:00","modifiedAt":"2026-10-19T21:19:23.088+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/macsec.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c09440f7dcb304002dfced8c0fea289eb25f2da0\",\n                            \"lessThan\": \"b6cec6187b8632423cd99a94fd5e5ba165fa2a33\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c09440f7dcb304002dfced8c0fea289eb25f2da0\",\n                            \"lessThan\": \"3adea1b1c04b57e08a5c12a1f42483760581ce61\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c09440f7dcb304002dfced8c0fea289eb25f2da0\",\n                            \"lessThan\": \"dc9ffa1905e72f026d080880a2e4cfc42aa91000\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c09440f7dcb304002dfced8c0fea289eb25f2da0\",\n                            \"lessThan\": \"f21fa533a3ed15ada74106aac4b9ddd078fc6b7a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c09440f7dcb304002dfced8c0fea289eb25f2da0\",\n                            \"lessThan\": \"e17a42199824973cd8212e95b21ffadf4114a21b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c09440f7dcb304002dfced8c0fea289eb25f2da0\",\n                            \"lessThan\": \"2cf10d042562283ff4ae97c02d0993d4f1b5ea29\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c09440f7dcb304002dfced8c0fea289eb25f2da0\",\n                            \"lessThan\": \"c39087ad0b97fc11a3b058dfc8db9fd370762cb9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c09440f7dcb304002dfced8c0fea289eb25f2da0\",\n                            \"lessThan\": \"f5089008f90c0a7c5520dff3934e0af00adf322d\",\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/macsec.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.265\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.216\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.178\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.145\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.97\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.40\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.5\",\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:L/A:H","score":7.3,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/b6cec6187b8632423cd99a94fd5e5ba165fa2a33","https://git.kernel.org/stable/c/3adea1b1c04b57e08a5c12a1f42483760581ce61","https://git.kernel.org/stable/c/dc9ffa1905e72f026d080880a2e4cfc42aa91000","https://git.kernel.org/stable/c/f21fa533a3ed15ada74106aac4b9ddd078fc6b7a","https://git.kernel.org/stable/c/e17a42199824973cd8212e95b21ffadf4114a21b","https://git.kernel.org/stable/c/2cf10d042562283ff4ae97c02d0993d4f1b5ea29","https://git.kernel.org/stable/c/c39087ad0b97fc11a3b058dfc8db9fd370762cb9","https://git.kernel.org/stable/c/f5089008f90c0a7c5520dff3934e0af00adf322d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72019","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72019","identifiers":["CVE-2026-72019"]},"retained":false,"historicalAffected":[]}],"coverage":[]}