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vuln-cve/data/2026/23xxx/CVE-2026-23086.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-23086",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-01-13T15:37:45.961Z",
"datePublished": "2026-02-04T16:08:10.047Z",
"dateUpdated": "2026-11-10T12:41:37.802Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-11T21:59:43.793Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: cap TX credit to local buffer size\n\nThe virtio transports derives its TX credit directly from peer_buf_alloc,\nwhich is set from the remote endpoint's SO_VM_SOCKETS_BUFFER_SIZE value.\n\nOn the host side this means that the amount of data we are willing to\nqueue for a connection is scaled by a guest-chosen buffer size, rather\nthan the host's own vsock configuration. A malicious guest can advertise\na large buffer and read slowly, causing the host to allocate a\ncorrespondingly large amount of sk_buff memory.\nThe same thing would happen in the guest with a malicious host, since\nvirtio transports share the same code base.\n\nIntroduce a small helper, virtio_transport_tx_buf_size(), that\nreturns min(peer_buf_alloc, buf_alloc), and use it wherever we consume\npeer_buf_alloc.\n\nThis ensures the effective TX window is bounded by both the peer's\nadvertised buffer and our own buf_alloc (already clamped to\nbuffer_max_size via SO_VM_SOCKETS_BUFFER_MAX_SIZE), so a remote peer\ncannot force the other to queue more data than allowed by its own\nvsock settings.\n\nOn an unpatched Ubuntu 22.04 host (~64 GiB RAM), running a PoC with\n32 guest vsock connections advertising 2 GiB each and reading slowly\ndrove Slab/SUnreclaim from ~0.5 GiB to ~57 GiB; the system only\nrecovered after killing the QEMU process. That said, if QEMU memory is\nlimited with cgroups, the maximum memory used will be limited.\n\nWith this patch applied:\n\n Before:\n MemFree: ~61.6 GiB\n Slab: ~142 MiB\n SUnreclaim: ~117 MiB\n\n After 32 high-credit connections:\n MemFree: ~61.5 GiB\n Slab: ~178 MiB\n SUnreclaim: ~152 MiB\n\nOnly ~35 MiB increase in Slab/SUnreclaim, no host OOM, and the guest\nremains responsive.\n\nCompatibility with non-virtio transports:\n\n - VMCI uses the AF_VSOCK buffer knobs to size its queue pairs per\n socket based on the local vsk->buffer_* values; the remote side\n cannot enlarge those queues beyond what the local endpoint\n configured.\n\n - Hyper-V's vsock transport uses fixed-size VMBus ring buffers and\n an MTU bound; there is no peer-controlled credit field comparable\n to peer_buf_alloc, and the remote endpoint cannot drive in-flight\n kernel memory above those ring sizes.\n\n - The loopback path reuses virtio_transport_common.c, so it\n naturally follows the same semantics as the virtio transport.\n\nThis change is limited to virtio_transport_common.c and thus affects\nvirtio-vsock, vhost-vsock, and loopback, bringing them in line with the\n\"remote window intersected with local policy\" behaviour that VMCI and\nHyper-V already effectively have.\n\n[Stefano: small adjustments after changing the previous patch]\n[Stefano: tweak the commit message]"
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/vmw_vsock/virtio_transport_common.c"
],
"versions": [
{
"version": "06a8fc78367d070720af960dcecec917d3ae5f3b",
"lessThan": "fef7110ae5617555c792a2bb4d27878d84583adf",
"status": "affected",
"versionType": "git"
},
{
"version": "06a8fc78367d070720af960dcecec917d3ae5f3b",
"lessThan": "d9d5f222558b42f6277eafaaa6080966faf37676",
"status": "affected",
"versionType": "git"
},
{
"version": "06a8fc78367d070720af960dcecec917d3ae5f3b",
"lessThan": "c0e42fb0e054c2b2ec4ee80f48ccd256ae0227ce",
"status": "affected",
"versionType": "git"
},
{
"version": "06a8fc78367d070720af960dcecec917d3ae5f3b",
"lessThan": "84ef86aa7120449828d1e0ce438c499014839711",
"status": "affected",
"versionType": "git"
},
{
"version": "06a8fc78367d070720af960dcecec917d3ae5f3b",
"lessThan": "8ee784fdf006cbe8739cfa093f54d326cbf54037",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/vmw_vsock/virtio_transport_common.c"
],
"versions": [
{
"version": "4.8",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.8",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.162",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.122",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.68",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.8",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.19",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.8",
"versionEndExcluding": "6.1.162"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.8",
"versionEndExcluding": "6.6.122"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.8",
"versionEndExcluding": "6.12.68"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.8",
"versionEndExcluding": "6.18.8"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.8",
"versionEndExcluding": "6.19"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/fef7110ae5617555c792a2bb4d27878d84583adf"
},
{
"url": "https://git.kernel.org/stable/c/d9d5f222558b42f6277eafaaa6080966faf37676"
},
{
"url": "https://git.kernel.org/stable/c/c0e42fb0e054c2b2ec4ee80f48ccd256ae0227ce"
},
{
"url": "https://git.kernel.org/stable/c/84ef86aa7120449828d1e0ce438c499014839711"
},
{
"url": "https://git.kernel.org/stable/c/8ee784fdf006cbe8739cfa093f54d326cbf54037"
}
],
"title": "vsock/virtio: cap TX credit to local buffer size",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-23086",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-06-10T20:42:20.829487Z"
}
}
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"type": "CWE",
"cweId": "CWE-400",
"description": "CWE-400 Uncontrolled Resource Consumption"
}
]
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-19T18:25:30.062Z"
}
},
{
"x_adpType": "supplier",
"providerMetadata": {
"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"shortName": "siemens-SADP",
"dateUpdated": "2026-11-10T12:41:37.802Z"
},
"affected": [
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)",
"versions": [
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"status": "affected",
"version": "V3.1.6",
"lessThan": "*",
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}
],
"defaultStatus": "unknown"
},
{
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]
}
}
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