{"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": "2026-05-23T16:02:46.914Z"}, "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\")"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/block/nbd.c"], "versions": [{"version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "lessThan": "198aa230a6f8c1f6af7ed26b29180749c3e79e4d", "status": "affected", "versionType": "git"}, {"version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "lessThan": "d3ba312675911ff9e3fefefd551751e153a9f0a9", "status": "affected", "versionType": "git"}, {"version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "lessThan": "3692884bd6187d89d41eef81e5a9724519fd01c1", "status": "affected", "versionType": "git"}, {"version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "lessThan": "1ba2ced2bbdf7e64a30c3e88c70ea8bc208d1509", "status": "affected", "versionType": "git"}, {"version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "lessThan": "6b69593f72e1bfba6ca47ca8d9b619341fded7d6", "status": "affected", "versionType": "git"}, {"version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "lessThan": "443a1721806b6ff6303b5229e9811d68172d622f", "status": "affected", "versionType": "git"}, {"version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "lessThan": "742012f6bf29553fdc460bf646a58df3a7b43d01", "status": "affected", "versionType": "git"}, {"version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "lessThan": "9517b82d8d422d426a988b213fdd45c6b417b86d", "status": "affected", "versionType": "git"}, {"version": "0a4e383fc3aa6540f804c4fd1184a96ae5de6ef8", "status": "affected", "versionType": "git"}, {"version": "2ef6f4bd60411934e3fc2715442c2afe70f84bf3", "status": "affected", "versionType": "git"}, {"version": "742fd49cf811ca164489e339b862e3fb8e240a73", "status": "affected", "versionType": "git"}, {"version": "14df8724aeeef338172e2a2d6efadc989921ca0f", "status": "affected", "versionType": "git"}, {"version": "4.14.204", "lessThan": "4.15", "status": "affected", "versionType": "semver"}, {"version": "4.19.155", "lessThan": "4.20", "status": "affected", "versionType": "semver"}, {"version": "5.4.75", "lessThan": "5.5", "status": "affected", "versionType": "semver"}, {"version": "5.9.5", "lessThan": "5.10", "status": "affected", "versionType": "semver"}]}, {"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": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.248", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.198", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.160", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.120", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.63", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.13", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.2", "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": "5.10", "versionEndExcluding": "5.10.248"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15.198"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.120"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.12.63"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.17.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.18.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.19"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.204"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.155"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9.5"}]}]}], "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"}, {"url": "https://git.kernel.org/stable/c/1ba2ced2bbdf7e64a30c3e88c70ea8bc208d1509"}, {"url": "https://git.kernel.org/stable/c/6b69593f72e1bfba6ca47ca8d9b619341fded7d6"}, {"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": {"engine": "bippy-1.2.0"}}}}

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{"cveTags": [], "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\")"}], "id": "CVE-2025-68372", "lastModified": "2026-04-15T00:35:42.020", "metrics": {}, "published": "2025-12-24T11:16:00.777", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/198aa230a6f8c1f6af7ed26b29180749c3e79e4d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1ba2ced2bbdf7e64a30c3e88c70ea8bc208d1509"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3692884bd6187d89d41eef81e5a9724519fd01c1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/443a1721806b6ff6303b5229e9811d68172d622f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6b69593f72e1bfba6ca47ca8d9b619341fded7d6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/742012f6bf29553fdc460bf646a58df3a7b43d01"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9517b82d8d422d426a988b213fdd45c6b417b86d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d3ba312675911ff9e3fefefd551751e153a9f0a9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: nbd: defer config put in recv_work", "id": "2424883", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2424883"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnbd: defer config put in recv_work\nThere is one uaf issue in recv_work when running NBD_CLEAR_SOCK and\nNBD_CMD_RECONFIGURE:\nnbd_genl_connect // conf_ref=2 (connect and recv_work A)\nnbd_open // conf_ref=3\nrecv_work A done // conf_ref=2\nNBD_CLEAR_SOCK // conf_ref=1\nnbd_genl_reconfigure // conf_ref=2 (trigger recv_work B)\nclose nbd // conf_ref=1\nrecv_work B\nconfig_put // conf_ref=0\natomic_dec(&config->recv_threads); -> UAF\nOr only running NBD_CLEAR_SOCK:\nnbd_genl_connect // conf_ref=2\nnbd_open // conf_ref=3\nNBD_CLEAR_SOCK // conf_ref=2\nclose nbd\nnbd_release\nconfig_put // conf_ref=1\nrecv_work\nconfig_put // conf_ref=0\natomic_dec(&config->recv_threads); -> UAF\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.\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.\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.\nIn addition, we don't need to worry about recv_work dropping the last\nnbd_put (which causes deadlock):\npath A (netlink with NBD_CFLAG_DESTROY_ON_DISCONNECT):\nconnect // nbd_refs=1 (trigger recv_work)\nopen nbd // nbd_refs=2\nNBD_CLEAR_SOCK\nclose nbd\nnbd_release\nnbd_disconnect_and_put\nflush_workqueue // recv_work done\nnbd_config_put\nnbd_put // nbd_refs=1\nnbd_put // nbd_refs=0\nqueue_work\npath B (netlink without NBD_CFLAG_DESTROY_ON_DISCONNECT):\nconnect // nbd_refs=2 (trigger recv_work)\nopen nbd // nbd_refs=3\nNBD_CLEAR_SOCK // conf_refs=2\nclose nbd\nnbd_release\nnbd_config_put // conf_refs=1\nnbd_put // nbd_refs=2\nrecv_work done // conf_refs=0, nbd_refs=1\nrmmod // nbd_refs=0\nDepends-on: e2daec488c57 (\"nbd: Fix hungtask when nbd_config_put\")"], "name": "CVE-2025-68372", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-12-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-68372\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-68372\nhttps://lore.kernel.org/linux-cve-announce/2025122401-CVE-2025-68372-98d0@gregkh/T"], "threat_severity": "Moderate"}

{}