CVE-2026-72019High· 7.3▾ TwilightIn 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 1…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 40.2 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= c09440f7dcb304002dfced8c0fea289eb25f2da0 < b6cec6187b8632423cd99a94fd5e5ba165fa2a33Linux >= c09440f7dcb304002dfced8c0fea289eb25f2da0 < 3adea1b1c04b57e08a5c12a1f42483760581ce61Linux >= c09440f7dcb304002dfced8c0fea289eb25f2da0 < dc9ffa1905e72f026d080880a2e4cfc42aa91000Linux >= c09440f7dcb304002dfced8c0fea289eb25f2da0 < f21fa533a3ed15ada74106aac4b9ddd078fc6b7aLinux >= c09440f7dcb304002dfced8c0fea289eb25f2da0 < e17a42199824973cd8212e95b21ffadf4114a21bLinux >= c09440f7dcb304002dfced8c0fea289eb25f2da0 < 2cf10d042562283ff4ae97c02d0993d4f1b5ea29Linux >= c09440f7dcb304002dfced8c0fea289eb25f2da0 < c39087ad0b97fc11a3b058dfc8db9fd370762cb9Linux >= c09440f7dcb304002dfced8c0fea289eb25f2da0 < f5089008f90c0a7c5520dff3934e0af00adf322dLinux 4.6Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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