CVE-2025-68366 (GCVE-0-2025-68366)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:32 – Updated: 2026-06-16 19:12
VLAI
Title
nbd: defer config unlock in nbd_genl_connect
Summary
In the Linux kernel, the following vulnerability has been resolved: nbd: defer config unlock in nbd_genl_connect There is one use-after-free warning when running NBD_CMD_CONNECT and NBD_CLEAR_SOCK: nbd_genl_connect nbd_alloc_and_init_config // config_refs=1 nbd_start_device // config_refs=2 set NBD_RT_HAS_CONFIG_REF open nbd // config_refs=3 recv_work done // config_refs=2 NBD_CLEAR_SOCK // config_refs=1 close nbd // config_refs=0 refcount_inc -> uaf ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 24 PID: 1014 at lib/refcount.c:25 refcount_warn_saturate+0x12e/0x290 nbd_genl_connect+0x16d0/0x1ab0 genl_family_rcv_msg_doit+0x1f3/0x310 genl_rcv_msg+0x44a/0x790 The issue can be easily reproduced by adding a small delay before refcount_inc(&nbd->config_refs) in nbd_genl_connect(): mutex_unlock(&nbd->config_lock); if (!ret) { set_bit(NBD_RT_HAS_CONFIG_REF, &config->runtime_flags); + printk("before sleep\n"); + mdelay(5 * 1000); + printk("after sleep\n"); refcount_inc(&nbd->config_refs); nbd_connect_reply(info, nbd->index); }
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 19:12 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 330d688a5ca53857828081a3cf31b92ad1b0b3ed (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < cd93db1b1b4460e6ee77564024ea461e5940f69c (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < ae3e7bc1f4b393ae20e5c85583eb2c6977374716 (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 2e5e0665a594f076ef2b9439447bae8be293d09d (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < c9b99c948b4fb014812afe7b5ccf2db121d22e46 (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 9a38306643874566d20f7aba7dff9e6f657b51a9 (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < c9e805f6a35d1dd189a9345595a5c20e87611942 (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 1649714b930f9ea6233ce0810ba885999da3b5d4 (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.63 , ≤ 6.12.* (semver)
Unaffected: 6.17.13 , ≤ 6.17.* (semver)
Unaffected: 6.18.2 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "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 -\u003e 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(\u0026nbd-\u003econfig_refs) in nbd_genl_connect():\n\n        mutex_unlock(\u0026nbd-\u003econfig_lock);\n        if (!ret) {\n                set_bit(NBD_RT_HAS_CONFIG_REF, \u0026config-\u003eruntime_flags);\n+               printk(\"before sleep\\n\");\n+               mdelay(5 * 1000);\n+               printk(\"after sleep\\n\");\n                refcount_inc(\u0026nbd-\u003econfig_refs);\n                nbd_connect_reply(info, nbd-\u003eindex);\n        }"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnbd: aplazar el desbloqueo de la configuraci\u00f3n en nbd_genl_connect\n\nHay una advertencia de uso despu\u00e9s de liberaci\u00f3n al ejecutar NBD_CMD_CONNECT y NBD_CLEAR_SOCK:\n\nnbd_genl_connect\n  nbd_alloc_and_init_config // config_refs=1\n  nbd_start_device // config_refs=2\n  establecer NBD_RT_HAS_CONFIG_REF abrir nbd // config_refs=3\n  recv_work terminado // config_refs=2\n\t\t\t\t\t\tNBD_CLEAR_SOCK // config_refs=1\n\t\t\t\t\t\tcerrar nbd // config_refs=0\n  refcount_inc  -\u003e  uaf\n\n------------[ cut here ]------------\nrefcount_t: adici\u00f3n en 0; uso despu\u00e9s de liberaci\u00f3n.\nADVERTENCIA: CPU: 24 PID: 1014 en 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\nEl problema puede reproducirse f\u00e1cilmente a\u00f1adiendo un peque\u00f1o retardo antes de refcount_inc(\u0026nbd -\u003e config_refs) en nbd_genl_connect():\n\n        mutex_unlock(\u0026nbd -\u003e config_lock);\n        if (!ret) {\n                set_bit(NBD_RT_HAS_CONFIG_REF, \u0026config -\u003e runtime_flags);\n+               printk(\u201cbefore sleep\\n\u201d);\n+               mdelay(5 * 1000);\n+               printk(\u201cafter sleep\\n\u201d);\n                refcount_inc(\u0026nbd -\u003e config_refs);\n                nbd_connect_reply(info, nbd -\u003e index);\n        }"
          }
        ],
        "id": "CVE-2025-68366",
        "lastModified": "2026-10-13T11:10:00.203",
        "metrics": {
          "ssvcV203": [
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        "published": "2025-12-24T11:16:00.163",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
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    },
    "redhat_vex": {
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      "current_release_date": "2026-11-05T15:35:20+00:00",
      "cve": "CVE-2025-68366",
      "id": "CVE-2025-68366",
      "initial_release_date": "2025-12-24T00:00:00+00:00",
      "product_status:fixed": "2026",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nbd: defer config unlock in nbd_genl_connect",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68366.json",
      "version": "3"
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      "current_release_date": "2026-10-30T01:06:01Z",
      "cve": "CVE-2025-68366",
      "id": "CVE-2025-68366",
      "initial_release_date": "2025-12-25T00:24:20Z",
      "product_status:known_affected": "780",
      "product_status:known_not_affected": "36",
      "product_status:recommended": "452",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-68366",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2025-68366.json",
      "version": "40"
    },
    "vulnrichment": {
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        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2025-68366",
                    "options": [
                      {
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                      },
                      {
                        "Automatable": "no"
                      },
                      {
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                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-06-16T19:12:23.169488Z",
                    "version": "2.0.3"
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            "providerMetadata": {
              "dateUpdated": "2026-06-16T19:12:30.563Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                  "status": "affected",
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "version": "0",
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                  "version": "5.15.198",
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                  "version": "6.1.160",
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                  "version": "6.12.63",
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                  "version": "6.17.13",
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                  "version": "6.18.2",
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                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.19",
                  "versionType": "original_commit_for_fix"
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            }
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          "cpeApplicability": [
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              "nodes": [
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.248",
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                      "vulnerable": true
                    },
                    {
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          "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 -\u003e 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(\u0026nbd-\u003econfig_refs) in nbd_genl_connect():\n\n        mutex_unlock(\u0026nbd-\u003econfig_lock);\n        if (!ret) {\n                set_bit(NBD_RT_HAS_CONFIG_REF, \u0026config-\u003eruntime_flags);\n+               printk(\"before sleep\\n\");\n+               mdelay(5 * 1000);\n+               printk(\"after sleep\\n\");\n                refcount_inc(\u0026nbd-\u003econfig_refs);\n                nbd_connect_reply(info, nbd-\u003eindex);\n        }"
            }
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            "dateUpdated": "2026-05-11T21:51:48.993Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            },
            {
              "url": "https://git.kernel.org/stable/c/1649714b930f9ea6233ce0810ba885999da3b5d4"
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          "title": "nbd: defer config unlock in nbd_genl_connect",
          "x_generator": {
            "engine": "bippy-1.2.0"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2025-68366",
        "datePublished": "2025-12-24T10:32:53.399Z",
        "dateReserved": "2025-12-16T14:48:05.308Z",
        "dateUpdated": "2026-06-16T19:12:35.384Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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