GHSA-VF8C-65H3-589V
Vulnerability from github – Published: 2026-09-16 09:30 – Updated: 2026-09-16 09:30In the Linux kernel, the following vulnerability has been resolved:
vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes
The VXLAN VNI filter entry policy declares the GROUP/GROUP6 address attributes as NLA_BINARY with only a maximum length, so validate_nla() accepts a payload shorter than the address. The GROUP consumer reads it with nla_get_in_addr(), an unconditional 4-byte load, so a short attribute over-reads up to 3 bytes of uninitialised slab data, which are stored into remote_ip and echoed back via RTM_GETTUNNEL, disclosing kernel memory.
Switch both entries to NLA_POLICY_EXACT_LEN() so the validator rejects any GROUP/GROUP6 that is not exactly 4 / 16 bytes; a valid address is always sent at full width.
{
"affected": [],
"aliases": [
"CVE-2026-89776"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-16T09:17:07Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes\n\nThe VXLAN VNI filter entry policy declares the GROUP/GROUP6 address\nattributes as NLA_BINARY with only a maximum length, so validate_nla()\naccepts a payload shorter than the address. The GROUP consumer reads it\nwith nla_get_in_addr(), an unconditional 4-byte load, so a short\nattribute over-reads up to 3 bytes of uninitialised slab data, which are\nstored into remote_ip and echoed back via RTM_GETTUNNEL, disclosing\nkernel memory.\n\nSwitch both entries to NLA_POLICY_EXACT_LEN() so the validator rejects\nany GROUP/GROUP6 that is not exactly 4 / 16 bytes; a valid address is\nalways sent at full width.",
"id": "GHSA-vf8c-65h3-589v",
"modified": "2026-09-16T09:30:29Z",
"published": "2026-09-16T09:30:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89776"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e12c4663529699f457b2988c1dfedf4d13b3b3be"
}
],
"schema_version": "1.4.0",
"severity": []
}
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