{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2025-68372", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-68372", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-12-24T10:33:02.679Z", "updatedAt": "2026-06-16T19:28:42.649Z", "importedAt": "2026-10-24T01:57:44.935Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "nbd: defer config put in recv_work", "summary": "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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "status": "affected", "versionType": "git", "lessThan": "198aa230a6f8c1f6af7ed26b29180749c3e79e4d" }, { "version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "status": "affected", "versionType": "git", "lessThan": "d3ba312675911ff9e3fefefd551751e153a9f0a9" }, { "version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "status": "affected", "versionType": "git", "lessThan": "3692884bd6187d89d41eef81e5a9724519fd01c1" }, { "version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "status": "affected", "versionType": "git", "lessThan": "1ba2ced2bbdf7e64a30c3e88c70ea8bc208d1509" }, { "version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "status": "affected", "versionType": "git", "lessThan": "6b69593f72e1bfba6ca47ca8d9b619341fded7d6" }, { "version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "status": "affected", "versionType": "git", "lessThan": "443a1721806b6ff6303b5229e9811d68172d622f" }, { "version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "status": "affected", "versionType": "git", "lessThan": "742012f6bf29553fdc460bf646a58df3a7b43d01" }, { "version": "87aac3a80af5cbad93e63250e8a1e19095ba0d30", "status": "affected", "versionType": "git", "lessThan": "9517b82d8d422d426a988b213fdd45c6b417b86d" }, { "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", "status": "affected", "versionType": "semver", "lessThan": "4.15" }, { "version": "4.19.155", "status": "affected", "versionType": "semver", "lessThan": "4.20" }, { "version": "5.4.75", "status": "affected", "versionType": "semver", "lessThan": "5.5" }, { "version": "5.9.5", "status": "affected", "versionType": "semver", "lessThan": "5.10" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.10" }, { "version": "5.10.248", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.198", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.160", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.120", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.63", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.17.13", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.17.*" }, { "version": "6.18.2", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "6.19", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }