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CVE-2026-74744— ipvlan: inherit needed_headroom and needed_tailroom from phy_dev

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： ipvlan：从 phy_dev 继承 needed_headroom 和 needed_tailroom ipvlan 设备在 过程中会从 继承 ，但将 和 保留为 0。 当底层 （或堆叠的下层设备）需要额外的 headroom 或 tailroom 来容纳报头/尾部数据（例如 MACsec、IPsec、WireGuard、隧道或具有接收端 headroom 的 veth 设备）时，上层在计算数据包所需的 headroom 和 tailroom 时，无法预留足够的空间。

CVSS 9.8 · Critical

Possible ATT&CK Techniques 1 AI

T1597 · Search Closed Sources

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 2ad7bf3638411cb547f2823df08166c13ab04269< af602c4d0ee548da18e2409b4b4da1079625a372 affected
2ad7bf3638411cb547f2823df08166c13ab04269< f3c17ff65f54781cde696e16a6c577615ed735aa affected
2ad7bf3638411cb547f2823df08166c13ab04269< c0fbe31f6b20ade0465130685859faa5c86fda59 affected
2ad7bf3638411cb547f2823df08166c13ab04269< 5f33188457bbcc1b11ca87084037963c516ed3d9 affected
2ad7bf3638411cb547f2823df08166c13ab04269< 5c2ca77212eb38559b0353b8363b7a84f4b019dd affected
2ad7bf3638411cb547f2823df08166c13ab04269< e16e960d55a40d36bd7c2494cc005e757dc9a1ef affected
3.19 affected
< 3.19 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-74744

Vulnerability Information
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Vulnerability Title
ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipvlan: inherit needed_headroom and needed_tailroom from phy_dev ipvlan devices inherit hard_header_len from phy_dev during ipvlan_init(), but leave needed_headroom and needed_tailroom set to 0. When the underlying phy_dev (or stacked lower device) 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() / ipvlan_hard_header() prepends header data or when lower devices append tailroom. Fix this by: 1. Inheriting needed_headroom and needed_tailroom from phy_dev in ipvlan_init(). 2. Propagating needed_headroom and needed_tailroom updates to attached ipvlans in ipvlan_device_event() when receiving NETDEV_FEAT_CHANGE events.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 2ad7bf3638411cb547f2823df08166c13ab04269 ~ af602c4d0ee548da18e2409b4b4da1079625a372 -
Linux Linux 3.19 -

II. Public POCs for CVE-2026-74744

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III. Intelligence Information for CVE-2026-74744

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Patches & Fixes for CVE-2026-74744 (6)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-74743 9.8 CRITICAL macvlan: inherit needed_headroom and needed_tailroom from lowerdev
CVE-2026-74752 9.8 CRITICAL sctp: validate cookie AUTH state before use
CVE-2026-80586 9.8 CRITICAL mptcp: options: reset DSS fields in case of unexpected size
CVE-2026-80519 9.8 CRITICAL ovpn: finish crypto callback cleanup before peer release
CVE-2026-80558 9.8 CRITICAL libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-74746 9.8 CRITICAL netfilter: flowtable: publish GC-visible tuple last
CVE-2026-80561 9.8 CRITICAL libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-80528 9.8 CRITICAL ceph: avoid fs reclaim while using current->journal_info
CVE-2026-80587 9.8 CRITICAL mptcp: avoid combining some incoming suboptions
CVE-2026-80557 9.8 CRITICAL libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-74737 9.8 CRITICAL net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
CVE-2026-80589 9.8 CRITICAL block: stop the timeout timer when releasing a never added disk
CVE-2026-80585 9.4 CRITICAL mptcp: fastopen: only mark MPTFO subflows with SYN data
CVE-2026-74751 9.4 CRITICAL riscv: lib: Fix ZBB strnlen reading past count boundary
CVE-2026-80551 9.3 CRITICAL s390/vfio_ccw: Ensure first IDAW remains constant
CVE-2026-80554 9.3 CRITICAL s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80552 8.8 HIGH s390/vfio_ccw: Ensure index for read/write regions are within range
CVE-2026-80553 8.8 HIGH s390/vfio_ccw: Cancel existing workqueues
CVE-2026-80547 8.8 HIGH s390/vfio_ccw: Implement a crw lock
CVE-2026-80576 8.8 HIGH drm/amdgpu: reject oversized IBs with per-ring packet limits

Showing top 20 of 92 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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