CVE-2026-74743

In the Linux kernel, the following vulnerability has been resolved: macvlan: inherit needed_headroom and needed_tailroom from lowerdev macvlan devices inherit hard_header_len from lowerdev during macvlan_init(), but leave needed_headroom and needed_tailroom set to 0. When the underlying lowerdev requires extra headroom or tailroom for headers/trailers (e.g. macsec, ipsec, wireguard, tunnels, or veth with rx headroom), upper layers calculating packet headroom and tailroom fail to reserve sufficient space. This can result in reallocation overhead, skb headroom underflows, or KASAN slab-use-after-free crashes when dev_hard_header() / macvlan_hard_header() prepends header data or when lower devices append tailroom. Fix this by: 1. Inheriting needed_headroom and needed_tailroom from lowerdev in macvlan_init(). 2. Propagating needed_headroom and needed_tailroom updates to attached macvlans in macvlan_device_event() when receiving NETDEV_FEAT_CHANGE events.

• https://git.kernel.org/stable/c/28afc87bd8da0b3348bbbd834c8a89e83712cf5e
• https://git.kernel.org/stable/c/8cd90e850e434577bf6774778657d26d6995e53f
• https://git.kernel.org/stable/c/8f6a05dbac05725e0786701eb04778c5bdbe4eaa
• https://git.kernel.org/stable/c/96fa90b74385b7f2b0d97251dd43d5ee6ca44668
• https://git.kernel.org/stable/c/bc9a00fb78e32bccc39d763bfd13a450705bac5d
• https://git.kernel.org/stable/c/cef51860becd9700217c81732ca1eb1ea6ed6fe1

Published

Aug 26, 2026

Last Modified

Aug 27, 2026

Status

Received

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-74736In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-74737In the Linux kernel, the following vulnerability has been re…9.8
• CVE-2026-74739In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-7474HashiCorp Nomad and Nomad Enterprise prior to 2.0.1 are vuln…8.8
• CVE-2026-74741In the Linux kernel, the following vulnerability has been re…7.5
• CVE-2026-74742In the Linux kernel, the following vulnerability has been re…7.5
• CVE-2026-74744In the Linux kernel, the following vulnerability has been re…9.8
• CVE-2026-74745In the Linux kernel, the following vulnerability has been re…7.5
• CVE-2026-74746In the Linux kernel, the following vulnerability has been re…9.8
• CVE-2026-74747In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-74748In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-7475The Sky Addons plugin for WordPress is vulnerable to Stored …6.4