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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
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)
guessed 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)
guessed 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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      "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"
    },
    "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

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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.