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vuln-cve/data/2026/99xxx/CVE-2026-99213.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-99213",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-25T10:25:14.401Z",
"datePublished": "2026-10-28T10:36:06.441Z",
"dateUpdated": "2026-10-31T12:45:10.380Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-31T12:45:10.380Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: treat TCP_CLOSING as once-established\n\nHandle the TCP_ESTABLISHED -> TCP_CLOSING transition on OP_RST, which can\nrace with the connect loop. Immediately break and return 0 on\nESTABLISHED/CLOSING. The return value of connect() should reflect what\nhappened up to the point the connection was established or failed. Events\nthat occur afterwards must not affect it. E.g. even if OP_RW has already\nset sk_err, connect() should still return 0, not ENOBUFS because of it.\nAdapt the inaccurate comment above signal_pending().\n\nResetting a socket that is still present in connected_table can lead to\nmemory corruption. The reporter noted lost transports for in-flight skbs,\nand I have reproduced crashes caused by re-insertion into connected_table.\n\n list_add double add: new=, prev=, next=.\n kernel BUG at lib/list_debug.c:35!\n Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n Workqueue: vsock-loopback vsock_loopback_work\n RIP: 0010:__list_add_valid_or_report+0x11f/0x130\n Call Trace:\n vsock_insert_connected.cold+0xe/0x13\n virtio_transport_recv_pkt+0x10e9/0x1460\n vsock_loopback_work+0x305/0x480\n process_one_work+0xe4c/0x1560\n worker_thread+0x4f1/0xd60\n kthread+0x36e/0x470\n ret_from_fork+0x47b/0x6b0\n ret_from_fork_asm+0x1a/0x30\n\nThis fix is supplementary to commit 002541ef650b (\"vsock: Ignore\nsignal/timeout on connect() if already established\"). Details under Link."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - A local connect() on AF_VSOCK reaches the patched vsock_connect() through connect_socket() and vsock_stream_ops.connect; VMADDR_CID_LOCAL drives the response and reset through vsock_loopback_work(), not a routable network protocol.\nAC:L - The same attacker can operate both VMADDR_CID_LOCAL endpoints, deliver signals while connect() races with RESPONSE/RST processing, and retry connect() until the controlled window is hit.\nPR:L - vsock_create() and vsock_connect() impose no capability check, and vsock_auto_bind() selects an unreserved port; CAP_NET_BIND_SERVICE is checked only for an explicit port at or below LAST_RESERVED_PORT.\nUI:N - The attacker's own threads perform socket creation, connect, peer reset, signal delivery, and reconnection without any action by another user.\nS:U - The corrupted connected_table and transport state belong to the same kernel reached by the local AF_VSOCK caller; this path does not cross a guest-host, IOMMU, or other security authority boundary.\nC:H - A transport-changing reconnect reaches vsock_deassign_transport() and virtio_transport_destruct(), freeing vsk->trans while virtio_transport_consume_skb_sent() can retain and dereference it for an in-flight skb; this heap use-after-free can expose reclaimed kernel contents.\nI:H - A same-transport reconnect passes the already-linked connected_table node to vsock_insert_connected() and list_add(), while the transport-change path can modify a freed virtio_vsock_sock through bytes_unsent; these corruptions support heap grooming and control-flow hijacking.\nA:H - The demonstrated re-insertion reaches __list_add_valid_or_report() and its list_add double-add BUG, producing a kernel Oops from vsock_loopback_work(); the attacker can repeat the connection sequence."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/vmw_vsock/af_vsock.c"
],
"versions": [
{
"version": "d021c344051af91f42c5ba9fdedc176740cbd238",
"lessThan": "ea36ef3c229d54b552432d1290aee1d807f67fd5",
"status": "affected",
"versionType": "git"
},
{
"version": "d021c344051af91f42c5ba9fdedc176740cbd238",
"lessThan": "5f2ab77028602a22f0cc33cac063a313787cbeae",
"status": "affected",
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},
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"lessThan": "f89770c7365748d9d6a2ae07d1c23497ca21ec07",
"status": "affected",
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{
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"status": "affected",
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{
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"lessThan": "c2c5359ef2c33684fa3f3652fd761a483db8d1e7",
"status": "affected",
"versionType": "git"
},
{
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"lessThan": "44d1ca05d6094a5d75c671a0545249186d790b8d",
"status": "affected",
"versionType": "git"
},
{
"version": "d021c344051af91f42c5ba9fdedc176740cbd238",
"lessThan": "4f6ac74fa594a918d41255c941256e1d51592d3b",
"status": "affected",
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}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/vmw_vsock/af_vsock.c"
],
"versions": [
{
"version": "3.9",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.9",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.273",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.161",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.115",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.59",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.13",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"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": "3.9",
"versionEndExcluding": "5.10.273"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
{
"url": "https://git.kernel.org/stable/c/ea36ef3c229d54b552432d1290aee1d807f67fd5"
},
{
"url": "https://git.kernel.org/stable/c/5f2ab77028602a22f0cc33cac063a313787cbeae"
},
{
"url": "https://git.kernel.org/stable/c/f89770c7365748d9d6a2ae07d1c23497ca21ec07"
},
{
"url": "https://git.kernel.org/stable/c/deb972c7eea8d0bc3109c35c30a1c86d4939f811"
},
{
"url": "https://git.kernel.org/stable/c/baf1b5715640e434249ce7f63f94bd1a00938ef9"
},
{
"url": "https://git.kernel.org/stable/c/c2c5359ef2c33684fa3f3652fd761a483db8d1e7"
},
{
"url": "https://git.kernel.org/stable/c/44d1ca05d6094a5d75c671a0545249186d790b8d"
},
{
"url": "https://git.kernel.org/stable/c/4f6ac74fa594a918d41255c941256e1d51592d3b"
}
],
"title": "vsock: treat TCP_CLOSING as once-established",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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