GHSA-6Q97-4P5Q-XV9V
Vulnerability from github – Published: 2026-10-09 09:31 – Updated: 2026-10-09 12:31In the Linux kernel, the following vulnerability has been resolved:
xen/netfront: drop RX packets with a short Ethernet header
handle_incoming_queue() pulls pull_to bytes into the head before calling eth_type_trans(). pull_to is the length of the first RX slot, capped at RX_COPY_THRESHOLD, and that length comes from the backend. Nothing checks it against ETH_HLEN.
If the first slot is shorter than ETH_HLEN and more slots follow, the head ends up shorter than an Ethernet header while skb->len is longer, and eth_type_trans() BUG()s in __skb_pull(). If the whole packet is shorter than ETH_HLEN, eth_type_trans() reads the header past the end of the data instead.
Pull at least ETH_HLEN, and drop the packet if that fails, which also drops packets too short to hold an Ethernet header. This also checks the return value of the pull, which was ignored.
{
"affected": [],
"aliases": [
"CVE-2026-98375"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-09T08:16:55Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen/netfront: drop RX packets with a short Ethernet header\n\nhandle_incoming_queue() pulls pull_to bytes into the head before\ncalling eth_type_trans(). pull_to is the length of the first RX slot,\ncapped at RX_COPY_THRESHOLD, and that length comes from the backend.\nNothing checks it against ETH_HLEN.\n\nIf the first slot is shorter than ETH_HLEN and more slots follow, the\nhead ends up shorter than an Ethernet header while skb-\u003elen is longer,\nand eth_type_trans() BUG()s in __skb_pull(). If the whole packet is\nshorter than ETH_HLEN, eth_type_trans() reads the header past the end\nof the data instead.\n\nPull at least ETH_HLEN, and drop the packet if that fails, which also\ndrops packets too short to hold an Ethernet header. This also checks\nthe return value of the pull, which was ignored.",
"id": "GHSA-6q97-4p5q-xv9v",
"modified": "2026-10-09T12:31:41Z",
"published": "2026-10-09T09:31:05Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98375"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/089e58805c452e52179482b1025a8e309a57f801"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2026/10/09/3"
},
{
"type": "WEB",
"url": "http://xenbits.xen.org/xsa/advisory-522.html"
}
],
"schema_version": "1.4.0",
"severity": []
}
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