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 (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
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)
Create a notification for this product.
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)
Create a notification for this product.
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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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      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:47:55Z",
      "cve": "CVE-2025-68366",
      "id": "CVE-2025-68366",
      "initial_release_date": "2025-12-25T00:24:20Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "709",
      "product_status:known_not_affected": "22",
      "product_status:recommended": "412",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-68366",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-68366.json",
      "version": "31"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-68366\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-16T19:12:23.169488Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-16T19:12:30.563Z\"}}], \"cna\": {\"title\": \"nbd: defer config unlock in nbd_genl_connect\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e46c7287b1c27683a8e30ca825fb98e2b97f1099\", \"lessThan\": \"330d688a5ca53857828081a3cf31b92ad1b0b3ed\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e46c7287b1c27683a8e30ca825fb98e2b97f1099\", \"lessThan\": \"cd93db1b1b4460e6ee77564024ea461e5940f69c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e46c7287b1c27683a8e30ca825fb98e2b97f1099\", \"lessThan\": \"ae3e7bc1f4b393ae20e5c85583eb2c6977374716\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e46c7287b1c27683a8e30ca825fb98e2b97f1099\", \"lessThan\": \"2e5e0665a594f076ef2b9439447bae8be293d09d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e46c7287b1c27683a8e30ca825fb98e2b97f1099\", \"lessThan\": \"c9b99c948b4fb014812afe7b5ccf2db121d22e46\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e46c7287b1c27683a8e30ca825fb98e2b97f1099\", \"lessThan\": \"9a38306643874566d20f7aba7dff9e6f657b51a9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e46c7287b1c27683a8e30ca825fb98e2b97f1099\", \"lessThan\": \"c9e805f6a35d1dd189a9345595a5c20e87611942\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e46c7287b1c27683a8e30ca825fb98e2b97f1099\", \"lessThan\": \"1649714b930f9ea6233ce0810ba885999da3b5d4\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/block/nbd.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.248\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.198\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.160\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.120\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.63\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.17.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.17.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/block/nbd.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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        }\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.248\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.198\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.160\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.120\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.63\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17.13\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.2\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"4.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:51:48.993Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-68366\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-16T19:12:35.384Z\", \"dateReserved\": \"2025-12-16T14:48:05.308Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-12-24T10:32:53.399Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.