CVE-2026-74744ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 2ad7bf3638411cb547f2823df08166c13ab04269 before af602c4d0ee548da18e2409b4b4da1079625a372; from 2ad7bf3638411cb547f2823df08166c13ab04269 before f3c17ff65f54781cde696e16a6c577615ed735aa; from 2ad7bf3638411cb547f2823df08166c13ab04269 before c0fbe31f6b20ade0465130685859faa5c86fda59; from 2ad7bf3638411cb547f2823df08166c13ab04269 before 5f33188457bbcc1b11ca87084037963c516ed3d9; from 2ad7bf3638411cb547f2823df08166c13ab04269 before 5c2ca77212eb38559b0353b8363b7a84f4b019dd; from 2ad7bf3638411cb547f2823df08166c13ab04269 before e16e960d55a40d36bd7c2494cc005e757dc9a1ef | CNA record |
References
- https://git.kernel.org/stable/c/af602c4d0ee548da18e2409b4b4da1079625a372
- https://git.kernel.org/stable/c/f3c17ff65f54781cde696e16a6c577615ed735aa
- https://git.kernel.org/stable/c/c0fbe31f6b20ade0465130685859faa5c86fda59
- https://git.kernel.org/stable/c/5f33188457bbcc1b11ca87084037963c516ed3d9
- https://git.kernel.org/stable/c/5c2ca77212eb38559b0353b8363b7a84f4b019dd
- https://git.kernel.org/stable/c/e16e960d55a40d36bd7c2494cc005e757dc9a1ef
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.