GHSA-59JJ-4QQ4-V9F9
Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-09-14 12:31In the Linux kernel, the following vulnerability has been resolved:
vxlan: use pskb_network_may_pull() for transmit path header pulls
In vxlan_xmit(), arp_reduce(), and vxlan_mdb_entry_skb_get(), pskb_may_pull() was being called to verify the availability of network layer headers (ARP, IPv6/ND, IP/IPv6 MDB keys).
However, during transmit skb->data points to the MAC header, so skb_network_offset(skb) is ETH_HLEN (14 bytes). Using pskb_may_pull(skb, len) only checks len bytes from skb->data rather than skb_network_offset(skb) + len, which can leave part of the network header in non-linear frags.
Replace these remaining pskb_may_pull() calls with pskb_network_may_pull() to properly account for the MAC header offset.
{
"affected": [],
"aliases": [
"CVE-2026-74474"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T13:17:52Z",
"severity": "CRITICAL"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: use pskb_network_may_pull() for transmit path header pulls\n\nIn vxlan_xmit(), arp_reduce(), and vxlan_mdb_entry_skb_get(), pskb_may_pull() was\nbeing called to verify the availability of network layer headers (ARP, IPv6/ND,\nIP/IPv6 MDB keys).\n\nHowever, during transmit skb-\u003edata points to the MAC header, so skb_network_offset(skb)\nis ETH_HLEN (14 bytes). Using pskb_may_pull(skb, len) only checks len bytes from skb-\u003edata\nrather than skb_network_offset(skb) + len, which can leave part of the network header\nin non-linear frags.\n\nReplace these remaining pskb_may_pull() calls with pskb_network_may_pull() to properly\naccount for the MAC header offset.",
"id": "GHSA-59jj-4qq4-v9f9",
"modified": "2026-09-14T12:31:32Z",
"published": "2026-08-15T15:30:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74474"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/371425d4be7795e9158388af9eee0201e6047410"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6146901881f09ef063eb34ad389f63231f8486f5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7076a34b6e33315dc160b4612bfea1c597495585"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/94dee751aad627b3645d424b5d0c736d394573e9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b9553558b48db54ac9273e6b98d7263ef5c1a329"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bb01c51950c3ff3c76acdd54b85ab38ccc2a8bb4"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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