CVE-2026-72019

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-72019

Key Details

CVE	CVE-2026-72019
CVSS Score / Version	7.3 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is low; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-72019
CVE	https://www.cve.org/CVERecord?id=CVE-2026-72019

Source

Reference

NVD

CVE