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vuln-cve/data/2026/46xxx/CVE-2026-46321.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-46321",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-05-13T15:03:33.112Z",
"datePublished": "2026-06-09T12:11:13.872Z",
"dateUpdated": "2026-10-15T01:21:35.519Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:31:16.239Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntun: free page on short-frame rejection in tun_xdp_one()\n\ntun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without\nfreeing the page that vhost_net_build_xdp() allocated for it.\ntun_sendmsg() discards that -EINVAL and still returns total_len, so\nvhost_tx_batch() takes the success path and never frees the page; each\nshort frame in a batch leaks one page-frag chunk.\n\nA local process that can open /dev/net/tun and /dev/vhost-net can hit\nthis path: it attaches a tun/tap device as the vhost-net backend and\nfeeds TX descriptors whose length minus the virtio-net header is below\nETH_HLEN. Each kick leaks the page-frag chunks for that batch, and a\ntight submission loop exhausts host memory and triggers an OOM panic.\nFree the page before returning -EINVAL, matching the XDP-program error\npath in the same function."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"baseScore": 7.1,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The flaw is reached via local host interfaces (/dev/net/tun and /dev/vhost-net ioctls/sendmsg) or from a KVM guest through virtio-net TX descriptors processed by vhost-net, not via remote network packets to the host stack.\nAC:L - An attacker reliably triggers the leak by repeatedly submitting TX frames whose length minus the virtio-net header is below ETH_HLEN; no races or attacker-uncontrollable layout conditions are required.\nPR:N - A malicious KVM guest on a host using vhost-net with a tun/tap backend needs no host privileges—only the ability to craft short virtio-net TX descriptors—while a direct host attacker can also obtain CAP_NET_ADMIN via unprivileged user namespaces.\nUI:N - Exploitation requires no victim interaction beyond normal VM or namespace operation; the attacker drives the vhost TX path directly in a tight loop.\nS:C - In the highest-impact cloud/KVM deployment, an unprivileged guest VM crosses the hypervisor security boundary to exhaust host kernel memory and panic the host, affecting resources outside the guest's security scope.\nC:N - The bug is a page-fragment memory leak with no out-of-bounds access, use-after-free, or information disclosure; freed pages are simply never returned to the allocator.\nI:N - No kernel memory corruption or data modification occurs; the only effect is unbounded consumption of page-frags leading to denial of service.\nA:H - Sustained submission of short batched frames leaks one page-frag per frame, exhausts host memory, and can trigger an OOM kernel panic as described in the fix commit."
}
]
}
],
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{
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"negate": false,
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"url": "https://git.kernel.org/stable/c/0a6f46a9332ad6958992d64d3b3a81a80b2ca940"
},
{
"url": "https://git.kernel.org/stable/c/0e8211fcf9426f5adddf32516ba0f400ceb9544d"
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{
"url": "https://git.kernel.org/stable/c/e915445942af6dcea628bf66d6241641201a0c41"
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{
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},
{
"url": "https://git.kernel.org/stable/c/98c67be9eb9de72465a071949e84a3cdb8fab5a3"
},
{
"url": "https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf"
}
],
"title": "tun: free page on short-frame rejection in tun_xdp_one()",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
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"x_adpType": "supplier",
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"shortName": "siemens-SADP",
"dateUpdated": "2026-10-15T01:21:35.519Z"
},
"affected": [
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"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
"versions": [
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],
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],
"references": [
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}
]
}
]
}
}
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