{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-68366", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-16T14:48:05.308Z", "datePublished": "2025-12-24T10:32:53.399Z", "dateUpdated": "2026-05-11T21:51:48.993Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:51:48.993Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: defer config unlock in nbd_genl_connect\n\nThere is one use-after-free warning when running NBD_CMD_CONNECT and\nNBD_CLEAR_SOCK:\n\nnbd_genl_connect\n nbd_alloc_and_init_config // config_refs=1\n nbd_start_device // config_refs=2\n set NBD_RT_HAS_CONFIG_REF\t\t\topen nbd // config_refs=3\n recv_work done // config_refs=2\n\t\t\t\t\t\tNBD_CLEAR_SOCK // config_refs=1\n\t\t\t\t\t\tclose nbd // config_refs=0\n refcount_inc -> uaf\n\n------------[ cut here ]------------\nrefcount_t: addition on 0; use-after-free.\nWARNING: CPU: 24 PID: 1014 at lib/refcount.c:25 refcount_warn_saturate+0x12e/0x290\n nbd_genl_connect+0x16d0/0x1ab0\n genl_family_rcv_msg_doit+0x1f3/0x310\n genl_rcv_msg+0x44a/0x790\n\nThe issue can be easily reproduced by adding a small delay before\nrefcount_inc(&nbd->config_refs) in nbd_genl_connect():\n\n mutex_unlock(&nbd->config_lock);\n if (!ret) {\n set_bit(NBD_RT_HAS_CONFIG_REF, &config->runtime_flags);\n+ printk(\"before sleep\\n\");\n+ mdelay(5 * 1000);\n+ printk(\"after sleep\\n\");\n refcount_inc(&nbd->config_refs);\n nbd_connect_reply(info, nbd->index);\n }"}], "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": "e46c7287b1c27683a8e30ca825fb98e2b97f1099", "lessThan": "330d688a5ca53857828081a3cf31b92ad1b0b3ed", "status": "affected", "versionType": "git"}, {"version": "e46c7287b1c27683a8e30ca825fb98e2b97f1099", "lessThan": "cd93db1b1b4460e6ee77564024ea461e5940f69c", "status": "affected", "versionType": "git"}, {"version": "e46c7287b1c27683a8e30ca825fb98e2b97f1099", "lessThan": "ae3e7bc1f4b393ae20e5c85583eb2c6977374716", "status": "affected", "versionType": "git"}, {"version": "e46c7287b1c27683a8e30ca825fb98e2b97f1099", "lessThan": "2e5e0665a594f076ef2b9439447bae8be293d09d", "status": "affected", "versionType": "git"}, {"version": "e46c7287b1c27683a8e30ca825fb98e2b97f1099", "lessThan": "c9b99c948b4fb014812afe7b5ccf2db121d22e46", "status": "affected", "versionType": "git"}, {"version": "e46c7287b1c27683a8e30ca825fb98e2b97f1099", "lessThan": "9a38306643874566d20f7aba7dff9e6f657b51a9", "status": "affected", "versionType": "git"}, {"version": "e46c7287b1c27683a8e30ca825fb98e2b97f1099", "lessThan": "c9e805f6a35d1dd189a9345595a5c20e87611942", "status": "affected", "versionType": "git"}, {"version": "e46c7287b1c27683a8e30ca825fb98e2b97f1099", "lessThan": "1649714b930f9ea6233ce0810ba885999da3b5d4", "status": "affected", "versionType": "git"}]}, {"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": "4.12", "status": "affected"}, {"version": "0", "lessThan": "4.12", "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": "4.12", "versionEndExcluding": "5.10.248"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "5.15.198"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.1.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.6.120"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.12.63"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.17.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.18.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/330d688a5ca53857828081a3cf31b92ad1b0b3ed"}, {"url": "https://git.kernel.org/stable/c/cd93db1b1b4460e6ee77564024ea461e5940f69c"}, {"url": "https://git.kernel.org/stable/c/ae3e7bc1f4b393ae20e5c85583eb2c6977374716"}, {"url": "https://git.kernel.org/stable/c/2e5e0665a594f076ef2b9439447bae8be293d09d"}, {"url": "https://git.kernel.org/stable/c/c9b99c948b4fb014812afe7b5ccf2db121d22e46"}, {"url": "https://git.kernel.org/stable/c/9a38306643874566d20f7aba7dff9e6f657b51a9"}, {"url": "https://git.kernel.org/stable/c/c9e805f6a35d1dd189a9345595a5c20e87611942"}, {"url": "https://git.kernel.org/stable/c/1649714b930f9ea6233ce0810ba885999da3b5d4"}], "title": "nbd: defer config unlock in nbd_genl_connect", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: defer config unlock in nbd_genl_connect\n\nThere is one use-after-free warning when running NBD_CMD_CONNECT and\nNBD_CLEAR_SOCK:\n\nnbd_genl_connect\n nbd_alloc_and_init_config // config_refs=1\n nbd_start_device // config_refs=2\n set NBD_RT_HAS_CONFIG_REF\t\t\topen nbd // config_refs=3\n recv_work done // config_refs=2\n\t\t\t\t\t\tNBD_CLEAR_SOCK // config_refs=1\n\t\t\t\t\t\tclose nbd // config_refs=0\n refcount_inc -> uaf\n\n------------[ cut here ]------------\nrefcount_t: addition on 0; use-after-free.\nWARNING: CPU: 24 PID: 1014 at lib/refcount.c:25 refcount_warn_saturate+0x12e/0x290\n nbd_genl_connect+0x16d0/0x1ab0\n genl_family_rcv_msg_doit+0x1f3/0x310\n genl_rcv_msg+0x44a/0x790\n\nThe issue can be easily reproduced by adding a small delay before\nrefcount_inc(&nbd->config_refs) in nbd_genl_connect():\n\n mutex_unlock(&nbd->config_lock);\n if (!ret) {\n set_bit(NBD_RT_HAS_CONFIG_REF, &config->runtime_flags);\n+ printk(\"before sleep\\n\");\n+ mdelay(5 * 1000);\n+ printk(\"after sleep\\n\");\n refcount_inc(&nbd->config_refs);\n nbd_connect_reply(info, nbd->index);\n }"}], "id": "CVE-2025-68366", "lastModified": "2026-04-15T00:35:42.020", "metrics": {}, "published": "2025-12-24T11:16:00.163", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1649714b930f9ea6233ce0810ba885999da3b5d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2e5e0665a594f076ef2b9439447bae8be293d09d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/330d688a5ca53857828081a3cf31b92ad1b0b3ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9a38306643874566d20f7aba7dff9e6f657b51a9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ae3e7bc1f4b393ae20e5c85583eb2c6977374716"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c9b99c948b4fb014812afe7b5ccf2db121d22e46"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c9e805f6a35d1dd189a9345595a5c20e87611942"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cd93db1b1b4460e6ee77564024ea461e5940f69c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: nbd: defer config unlock in nbd_genl_connect", "id": "2424881", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2424881"}, "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 unlock in nbd_genl_connect\nThere is one use-after-free warning when running NBD_CMD_CONNECT and\nNBD_CLEAR_SOCK:\nnbd_genl_connect\nnbd_alloc_and_init_config // config_refs=1\nnbd_start_device // config_refs=2\nset NBD_RT_HAS_CONFIG_REFopen nbd // config_refs=3\nrecv_work done // config_refs=2\nNBD_CLEAR_SOCK // config_refs=1\nclose nbd // config_refs=0\nrefcount_inc -> uaf\n------------[ cut here ]------------\nrefcount_t: addition on 0; use-after-free.\nWARNING: CPU: 24 PID: 1014 at lib/refcount.c:25 refcount_warn_saturate+0x12e/0x290\nnbd_genl_connect+0x16d0/0x1ab0\ngenl_family_rcv_msg_doit+0x1f3/0x310\ngenl_rcv_msg+0x44a/0x790\nThe issue can be easily reproduced by adding a small delay before\nrefcount_inc(&nbd->config_refs) in nbd_genl_connect():\nmutex_unlock(&nbd->config_lock);\nif (!ret) {\nset_bit(NBD_RT_HAS_CONFIG_REF, &config->runtime_flags);\n+ printk(\"before sleep\\n\");\n+ mdelay(5 * 1000);\n+ printk(\"after sleep\\n\");\nrefcount_inc(&nbd->config_refs);\nnbd_connect_reply(info, nbd->index);\n}"], "name": "CVE-2025-68366", "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-2025-68366\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-68366\nhttps://lore.kernel.org/linux-cve-announce/2025122459-CVE-2025-68366-b367@gregkh/T"], "threat_severity": "Low"}

{}