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vuln-cve/data/2025/68xxx/CVE-2025-68372.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-68372",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-12-16T14:48:05.310Z",
"datePublished": "2025-12-24T10:33:02.679Z",
"dateUpdated": "2026-06-16T19:28:42.649Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-23T16:02:46.914Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: defer config put in recv_work\n\nThere is one uaf issue in recv_work when running NBD_CLEAR_SOCK and\nNBD_CMD_RECONFIGURE:\n nbd_genl_connect // conf_ref=2 (connect and recv_work A)\n nbd_open\t // conf_ref=3\n recv_work A done // conf_ref=2\n NBD_CLEAR_SOCK // conf_ref=1\n nbd_genl_reconfigure // conf_ref=2 (trigger recv_work B)\n close nbd\t // conf_ref=1\n recv_work B\n config_put // conf_ref=0\n atomic_dec(&config->recv_threads); -> UAF\n\nOr only running NBD_CLEAR_SOCK:\n nbd_genl_connect // conf_ref=2\n nbd_open \t // conf_ref=3\n NBD_CLEAR_SOCK // conf_ref=2\n close nbd\n nbd_release\n config_put // conf_ref=1\n recv_work\n config_put \t // conf_ref=0\n atomic_dec(&config->recv_threads); -> UAF\n\nCommit 87aac3a80af5 (\"nbd: call nbd_config_put() before notifying the\nwaiter\") moved nbd_config_put() to run before waking up the waiter in\nrecv_work, in order to ensure that nbd_start_device_ioctl() would not\nbe woken up while nbd->task_recv was still uncleared.\n\nHowever, in nbd_start_device_ioctl(), after being woken up it explicitly\ncalls flush_workqueue() to make sure all current works are finished.\nTherefore, there is no need to move the config put ahead of the wakeup.\n\nMove nbd_config_put() to the end of recv_work, so that the reference is\nheld for the whole lifetime of the worker thread. This makes sure the\nconfig cannot be freed while recv_work is still running, even if clear\n+ reconfigure interleave.\n\nIn addition, we don't need to worry about recv_work dropping the last\nnbd_put (which causes deadlock):\n\npath A (netlink with NBD_CFLAG_DESTROY_ON_DISCONNECT):\n connect // nbd_refs=1 (trigger recv_work)\n open nbd // nbd_refs=2\n NBD_CLEAR_SOCK\n close nbd\n nbd_release\n nbd_disconnect_and_put\n flush_workqueue // recv_work done\n nbd_config_put\n nbd_put // nbd_refs=1\n nbd_put // nbd_refs=0\n queue_work\n\npath B (netlink without NBD_CFLAG_DESTROY_ON_DISCONNECT):\n connect // nbd_refs=2 (trigger recv_work)\n open nbd // nbd_refs=3\n NBD_CLEAR_SOCK // conf_refs=2\n close nbd\n nbd_release\n nbd_config_put // conf_refs=1\n nbd_put // nbd_refs=2\n recv_work done // conf_refs=0, nbd_refs=1\n rmmod // nbd_refs=0\n\nDepends-on: e2daec488c57 (\"nbd: Fix hungtask when nbd_config_put\")"
}
],
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{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/block/nbd.c"
],
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"version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30",
"lessThan": "198aa230a6f8c1f6af7ed26b29180749c3e79e4d",
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},
{
"version": "4.14.204",
"lessThan": "4.15",
"status": "affected",
"versionType": "semver"
},
{
"version": "4.19.155",
"lessThan": "4.20",
"status": "affected",
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},
{
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"lessThan": "5.5",
"status": "affected",
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},
{
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]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/block/nbd.c"
],
"versions": [
{
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"status": "affected"
},
{
"version": "0",
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"status": "unaffected",
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},
{
"version": "5.10.248",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
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},
{
"version": "5.15.198",
"lessThanOrEqual": "5.15.*",
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},
{
"version": "6.1.160",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.120",
"lessThanOrEqual": "6.6.*",
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},
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},
{
"version": "6.19",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
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"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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"references": [
{
"url": "https://git.kernel.org/stable/c/198aa230a6f8c1f6af7ed26b29180749c3e79e4d"
},
{
"url": "https://git.kernel.org/stable/c/d3ba312675911ff9e3fefefd551751e153a9f0a9"
},
{
"url": "https://git.kernel.org/stable/c/3692884bd6187d89d41eef81e5a9724519fd01c1"
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{
"url": "https://git.kernel.org/stable/c/1ba2ced2bbdf7e64a30c3e88c70ea8bc208d1509"
},
{
"url": "https://git.kernel.org/stable/c/6b69593f72e1bfba6ca47ca8d9b619341fded7d6"
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{
"url": "https://git.kernel.org/stable/c/443a1721806b6ff6303b5229e9811d68172d622f"
},
{
"url": "https://git.kernel.org/stable/c/742012f6bf29553fdc460bf646a58df3a7b43d01"
},
{
"url": "https://git.kernel.org/stable/c/9517b82d8d422d426a988b213fdd45c6b417b86d"
}
],
"title": "nbd: defer config put in recv_work",
"x_generator": {
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}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-06-16T19:28:28.671225Z",
"id": "CVE-2025-68372",
"options": [
{
"Exploitation": "none"
},
{
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},
{
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}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
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}
],
"title": "CISA ADP Vulnrichment",
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"shortName": "CISA-ADP",
"dateUpdated": "2026-06-16T19:28:42.649Z"
}
}
]
}
}
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