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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-72019 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/2cf10d042562283ff4ae97c02d0993d4f1b5ea29 kernel.org
https://git.kernel.org/stable/c/c39087ad0b97fc11a3b058dfc8db9fd370762cb9 kernel.org
https://git.kernel.org/stable/c/dc9ffa1905e72f026d080880a2e4cfc42aa91000 kernel.org
https://git.kernel.org/stable/c/e17a42199824973cd8212e95b21ffadf4114a21b kernel.org
https://git.kernel.org/stable/c/f21fa533a3ed15ada74106aac4b9ddd078fc6b7a kernel.org
https://git.kernel.org/stable/c/f5089008f90c0a7c5520dff3934e0af00adf322d kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-72019
NVD Published Date:
08/15/2026
NVD Last Modified:
08/15/2026
Source:
kernel.org