CVE-2026-74744ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
- 9.8CriticalCVSS base score
- 0.51%Exploitation in 30 daysEPSS · top 56% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 51 days later
· 51 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.51% · top 56% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < af602c4d0ee548da18e2409b4b4da1079625a372
- affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < f3c17ff65f54781cde696e16a6c577615ed735aa
- affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < c0fbe31f6b20ade0465130685859faa5c86fda59
- affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < 5f33188457bbcc1b11ca87084037963c516ed3d9
- affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < 5c2ca77212eb38559b0353b8363b7a84f4b019dd
- affected 2ad7bf3638411cb547f2823df08166c13ab04269 – < e16e960d55a40d36bd7c2494cc005e757dc9a1ef
- affected 3.19
- unaffected < 3.19
- unaffected 6.1.184 – ≤ 6.1.*
- unaffected 6.6.153 – ≤ 6.6.*
- unaffected 6.12.105 – ≤ 6.12.*
- unaffected 6.18.46 – ≤ 6.18.*
- unaffected 7.1.10 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/af602c4d0ee548da18e2409b4b4da1079625a372 (opens in a new tab)
- https://git.kernel.org/stable/c/f3c17ff65f54781cde696e16a6c577615ed735aa (opens in a new tab)
- https://git.kernel.org/stable/c/c0fbe31f6b20ade0465130685859faa5c86fda59 (opens in a new tab)
- https://git.kernel.org/stable/c/5f33188457bbcc1b11ca87084037963c516ed3d9 (opens in a new tab)
- https://git.kernel.org/stable/c/5c2ca77212eb38559b0353b8363b7a84f4b019dd (opens in a new tab)
- https://git.kernel.org/stable/c/e16e960d55a40d36bd7c2494cc005e757dc9a1ef (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-66574 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-74744)Record last updated .