GHSA-J962-FX34-5263
Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-28 09:31In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_tunnel: fix use-after-free on object destroy
nft_tunnel_obj_destroy() calls metadata_dst_free() which directly kfree()s the metadata_dst, ignoring the dst_entry refcount. Packets that took a reference via dst_hold() in nft_tunnel_obj_eval() and are still queued (e.g. in a netem qdisc) are left with a dangling pointer. When these packets are eventually dequeued, dst_release() operates on freed memory.
Replace metadata_dst_free() with dst_release() so the metadata_dst is freed only after all references are dropped. The dst subsystem already handles metadata_dst cleanup in dst_destroy() when DST_METADATA is set.
{
"affected": [],
"aliases": [
"CVE-2026-53212"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-25T09:16:38Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_tunnel: fix use-after-free on object destroy\n\nnft_tunnel_obj_destroy() calls metadata_dst_free() which directly\nkfree()s the metadata_dst, ignoring the dst_entry refcount. Packets\nthat took a reference via dst_hold() in nft_tunnel_obj_eval() and\nare still queued (e.g. in a netem qdisc) are left with a dangling\npointer. When these packets are eventually dequeued, dst_release()\noperates on freed memory.\n\nReplace metadata_dst_free() with dst_release() so the metadata_dst\nis freed only after all references are dropped. The dst subsystem\nalready handles metadata_dst cleanup in dst_destroy() when\nDST_METADATA is set.",
"id": "GHSA-j962-fx34-5263",
"modified": "2026-06-28T09:31:44Z",
"published": "2026-06-25T09:31:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53212"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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