{"id":"CVE-2026-74744","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-74744","generatedAt":"2026-10-28T02:12:14.486Z","title":"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…","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipvlan: inherit needed_headroom and needed_tailroom from phy_dev\n\nipvlan devices inherit hard_header_len from phy_dev during ipvlan_init(),\nbut leave needed_headroom and needed_tailroom set to 0.\n\nWhen the underlying phy_dev (or stacked lower device) requires extra headroom\nor tailroom for headers/trailers (e.g. macsec, ipsec, wireguard, tunnels, or\nveth with rx headroom), upper layers calculating packet headroom and tailroom\nfail to reserve sufficient space.\n\nThis can result in reallocation overhead, skb headroom underflows, or KASAN\nslab-use-after-free crashes when dev_hard_header() / ipvlan_hard_header()\nprepends header data or when lower devices append tailroom.\n\nFix this by:\n1. Inheriting needed_headroom and needed_tailroom from phy_dev in ipvlan_init().\n2. Propagating needed_headroom and needed_tailroom updates to attached ipvlans\n   in ipvlan_device_event() when receiving NETDEV_FEAT_CHANGE events.","published":"2026-08-26T15:16:53.000Z","lastModified":"2026-10-16T20:17:56.000Z","status":"Received","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":[],"affected":[],"epss":{"score":0.00512,"percentile":0.4341,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.51%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/5c2ca77212eb38559b0353b8363b7a84f4b019dd","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5f33188457bbcc1b11ca87084037963c516ed3d9","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/af602c4d0ee548da18e2409b4b4da1079625a372","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c0fbe31f6b20ade0465130685859faa5c86fda59","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e16e960d55a40d36bd7c2494cc005e757dc9a1ef","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f3c17ff65f54781cde696e16a6c577615ed735aa","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74744","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}