{"apiVersion":"1.0","identifier":"CVE-2026-72019","description":"In the Linux kernel, the following vulnerability has been resolved: macsec: don-t read an unset MAC header in macsec_encrypt() macsec_encrypt() reads the Ethernet header via eth_hdr(skb) (skb->head + skb->mac_header) to memmove() the 12 source/destination MAC bytes forward and make room for the SecTAG. On the AF_PACKET SOCK_RAW + PACKET_QDISC_BYPASS transmit path the skb reaches the macsec ndo_start_xmit() with the MAC header unset, so eth_hdr(skb) resolves to skb->head + (u16)~0 and the read is out of bounds: a 12-byte heap over-read that is also emitted on the wire as the frame-s outer source/destination MAC. KASAN reports a slab-out-of-bounds read in macsec_start_xmit() on 6.0; on current mainline a CONFIG_DEBUG_NET build flags it as an unset mac header in skb_mac_header(). On the TX path the L2 header is at skb->data, so use skb_eth_hdr(), added by commit 96cc4b69581d (-macvlan: do not assume mac_header is set in macvlan_broadcast()-) for exactly this purpose.","publishedAt":"2026-08-15T06:21:00","lastModifiedAt":"2026-08-19T17:20:57","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72019","cvssScore":7.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H","epssProbability":0.00168,"riskScore":0.74,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-72019","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-72019","en":"https://www.redsauce.net/en/cves/CVE-2026-72019","fr":"https://www.redsauce.net/fr/cves/CVE-2026-72019","pt":"https://www.redsauce.net/pt/cves/CVE-2026-72019","de":"https://www.redsauce.net/de/cves/CVE-2026-72019","sk":"https://www.redsauce.net/sk/cves/CVE-2026-72019","el":"https://www.redsauce.net/el/cves/CVE-2026-72019"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-72019"}}