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CVE-2022-49300 (GCVE-0-2022-49300)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:10 – Updated: 2026-05-11 18:57
VLAI
Title
nbd: fix race between nbd_alloc_config() and module removal
Summary
In the Linux kernel, the following vulnerability has been resolved: nbd: fix race between nbd_alloc_config() and module removal When nbd module is being removing, nbd_alloc_config() may be called concurrently by nbd_genl_connect(), although try_module_get() will return false, but nbd_alloc_config() doesn't handle it. The race may lead to the leak of nbd_config and its related resources (e.g, recv_workq) and oops in nbd_read_stat() due to the unload of nbd module as shown below: BUG: kernel NULL pointer dereference, address: 0000000000000040 Oops: 0000 [#1] SMP PTI CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Workqueue: knbd16-recv recv_work [nbd] RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd] Call Trace: recv_work+0x3b/0xb0 [nbd] process_one_work+0x1ed/0x390 worker_thread+0x4a/0x3d0 kthread+0x12a/0x150 ret_from_fork+0x22/0x30 Fixing it by checking the return value of try_module_get() in nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV), assign nbd->config only when nbd_alloc_config() succeeds to ensure the value of nbd->config is binary (valid or NULL). Also adding a debug message to check the reference counter of nbd_config during module removal.
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:44 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 165cf2e0019fa6cedc75b456490c41494c34abb4 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 2573f2375b64280be977431701ed5d33b75b9ad0 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 8a7da4ced236ce6637fe70f14ca18e718d4bf9e9 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 122e4adaff2439f1cc18cc7e931980fa7560df5c (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 71c142f910da44421213ade601bcbd23ceae19fa (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 2888fa41985f93ed0a6837cfbb06bcbfd7fa2314 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < d09525720dd5201756f698bee1076de9aefd4602 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < c55b2b983b0fa012942c3eb16384b2b722caa810 (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 4.14.283 , ≤ 4.14.* (semver)
Unaffected: 4.19.247 , ≤ 4.19.* (semver)
Unaffected: 5.4.198 , ≤ 5.4.* (semver)
Unaffected: 5.10.122 , ≤ 5.10.* (semver)
Unaffected: 5.15.47 , ≤ 5.15.* (semver)
Unaffected: 5.17.15 , ≤ 5.17.* (semver)
Unaffected: 5.18.4 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: fix race between nbd_alloc_config() and module removal\n\nWhen nbd module is being removing, nbd_alloc_config() may be\ncalled concurrently by nbd_genl_connect(), although try_module_get()\nwill return false, but nbd_alloc_config() doesn\u0027t handle it.\n\nThe race may lead to the leak of nbd_config and its related\nresources (e.g, recv_workq) and oops in nbd_read_stat() due\nto the unload of nbd module as shown below:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000040\n  Oops: 0000 [#1] SMP PTI\n  CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\n  Workqueue: knbd16-recv recv_work [nbd]\n  RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd]\n  Call Trace:\n   recv_work+0x3b/0xb0 [nbd]\n   process_one_work+0x1ed/0x390\n   worker_thread+0x4a/0x3d0\n   kthread+0x12a/0x150\n   ret_from_fork+0x22/0x30\n\nFixing it by checking the return value of try_module_get()\nin nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV),\nassign nbd-\u003econfig only when nbd_alloc_config() succeeds to ensure\nthe value of nbd-\u003econfig is binary (valid or NULL).\n\nAlso adding a debug message to check the reference counter\nof nbd_config during module removal."
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49300\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T07:01:06.830\",\"lastModified\":\"2026-06-17T05:17:38.703\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnbd: fix race between nbd_alloc_config() and module removal\\n\\nWhen nbd module is being removing, nbd_alloc_config() may be\\ncalled concurrently by nbd_genl_connect(), although try_module_get()\\nwill return false, but nbd_alloc_config() doesn\u0027t handle it.\\n\\nThe race may lead to the leak of nbd_config and its related\\nresources (e.g, recv_workq) and oops in nbd_read_stat() due\\nto the unload of nbd module as shown below:\\n\\n  BUG: kernel NULL pointer dereference, address: 0000000000000040\\n  Oops: 0000 [#1] SMP PTI\\n  CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1\\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\\n  Workqueue: knbd16-recv recv_work [nbd]\\n  RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd]\\n  Call Trace:\\n   recv_work+0x3b/0xb0 [nbd]\\n   process_one_work+0x1ed/0x390\\n   worker_thread+0x4a/0x3d0\\n   kthread+0x12a/0x150\\n   ret_from_fork+0x22/0x30\\n\\nFixing it by checking the return value of try_module_get()\\nin nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV),\\nassign nbd-\u003econfig only when nbd_alloc_config() succeeds to ensure\\nthe value of nbd-\u003econfig is binary (valid or NULL).\\n\\nAlso adding a debug message to check the reference counter\\nof nbd_config during module removal.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nbd: se corrige la ejecuci\u00f3n entre nbd_alloc_config() y la eliminaci\u00f3n del m\u00f3dulo Cuando se elimina el m\u00f3dulo nbd, nbd_alloc_config() puede ser llamado simult\u00e1neamente por nbd_genl_connect(), aunque try_module_get() devolver\u00e1 falso, pero nbd_alloc_config() no lo maneja. La ejecuci\u00f3n puede provocar la fuga de nbd_config y sus recursos relacionados (por ejemplo, recv_workq) y oops en nbd_read_stat() debido a la descarga del m\u00f3dulo nbd como se muestra a continuaci\u00f3n: ERROR: desreferencia de puntero NULL del n\u00facleo, direcci\u00f3n: 0000000000000040 Oops: 0000 [#1] SMP PTI CPU: 5 PID: 13840 Comm: kworker/u17:33 No contaminado 5.14.0+ #1 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996) Cola de trabajo: knbd16-recv recv_work [nbd] RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd] Rastreo de llamadas: recv_work+0x3b/0xb0 [nbd] process_one_work+0x1ed/0x390 worker_thread+0x4a/0x3d0 kthread+0x12a/0x150 ret_from_fork+0x22/0x30 Lo solucionamos comprobando el valor de retorno de try_module_get() en nbd_alloc_config(). Como nbd_alloc_config() puede devolver ERR_PTR(-ENODEV), asigne nbd-\u0026gt;config solo cuando nbd_alloc_config() tenga \u00e9xito para garantizar que el valor de nbd-\u0026gt;config sea binario (v\u00e1lido o NULL). Tambi\u00e9n se agreg\u00f3 un mensaje de depuraci\u00f3n para comprobar el contador de referencia de nbd_config durante la eliminaci\u00f3n del m\u00f3dulo.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/block/nbd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5ea8d10802ec4c153a6e21eebaf412e2abd29736\",\"lessThan\":\"165cf2e0019fa6cedc75b456490c41494c34abb4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ea8d10802ec4c153a6e21eebaf412e2abd29736\",\"lessThan\":\"2573f2375b64280be977431701ed5d33b75b9ad0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ea8d10802ec4c153a6e21eebaf412e2abd29736\",\"lessThan\":\"8a7da4ced236ce6637fe70f14ca18e718d4bf9e9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ea8d10802ec4c153a6e21eebaf412e2abd29736\",\"lessThan\":\"122e4adaff2439f1cc18cc7e931980fa7560df5c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ea8d10802ec4c153a6e21eebaf412e2abd29736\",\"lessThan\":\"71c142f910da44421213ade601bcbd23ceae19fa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ea8d10802ec4c153a6e21eebaf412e2abd29736\",\"lessThan\":\"2888fa41985f93ed0a6837cfbb06bcbfd7fa2314\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ea8d10802ec4c153a6e21eebaf412e2abd29736\",\"lessThan\":\"d09525720dd5201756f698bee1076de9aefd4602\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5ea8d10802ec4c153a6e21eebaf412e2abd29736\",\"lessThan\":\"c55b2b983b0fa012942c3eb16384b2b722caa810\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/block/nbd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.283\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.247\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.198\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.122\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.47\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.17.15\",\"lessThanOrEqual\":\"5.17.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.18.4\",\"lessThanOrEqual\":\"5.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.19\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2025-10-01T19:44:48.211252Z\",\"id\":\"CVE-2022-49300\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"},{\"lang\":\"en\",\"value\":\"CWE-476\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"4.14.283\",\"matchCriteriaId\":\"42074657-A7B6-4740-88B7-67B440018C1C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.247\",\"matchCriteriaId\":\"B8CFA0F4-2D75-41F4-9753-87944A08B53B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.198\",\"matchCriteriaId\":\"3EC49633-14DE-4EBD-BB80-76AE2E3EABB9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.122\",\"matchCriteriaId\":\"1B42AA01-44D8-4572-95E6-FF8E374CF9C5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.47\",\"matchCriteriaId\":\"FC042EE3-4864-4325-BE0B-4BCDBF11AA61\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.17.15\",\"matchCriteriaId\":\"53E7AA2E-2FB4-45CA-A22B-08B4EDBB51AD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.18\",\"versionEndExcluding\":\"5.18.4\",\"matchCriteriaId\":\"FA6D643C-6D6A-4821-8A8D-B5776B8F0103\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/122e4adaff2439f1cc18cc7e931980fa7560df5c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/165cf2e0019fa6cedc75b456490c41494c34abb4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2573f2375b64280be977431701ed5d33b75b9ad0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2888fa41985f93ed0a6837cfbb06bcbfd7fa2314\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/71c142f910da44421213ade601bcbd23ceae19fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8a7da4ced236ce6637fe70f14ca18e718d4bf9e9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c55b2b983b0fa012942c3eb16384b2b722caa810\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d09525720dd5201756f698bee1076de9aefd4602\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:04:18+00:00",
      "cve": "CVE-2022-49300",
      "id": "CVE-2022-49300",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "62",
      "product_status:known_not_affected": "212",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nbd: fix race between nbd_alloc_config() and module removal",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49300.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 4.7, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49300\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T19:44:48.211252Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T16:13:24.727Z\"}}], \"cna\": {\"title\": \"nbd: fix race between nbd_alloc_config() and module removal\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5ea8d10802ec4c153a6e21eebaf412e2abd29736\", \"lessThan\": \"165cf2e0019fa6cedc75b456490c41494c34abb4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5ea8d10802ec4c153a6e21eebaf412e2abd29736\", \"lessThan\": \"2573f2375b64280be977431701ed5d33b75b9ad0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5ea8d10802ec4c153a6e21eebaf412e2abd29736\", \"lessThan\": \"8a7da4ced236ce6637fe70f14ca18e718d4bf9e9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5ea8d10802ec4c153a6e21eebaf412e2abd29736\", \"lessThan\": \"122e4adaff2439f1cc18cc7e931980fa7560df5c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5ea8d10802ec4c153a6e21eebaf412e2abd29736\", \"lessThan\": \"71c142f910da44421213ade601bcbd23ceae19fa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5ea8d10802ec4c153a6e21eebaf412e2abd29736\", \"lessThan\": \"2888fa41985f93ed0a6837cfbb06bcbfd7fa2314\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5ea8d10802ec4c153a6e21eebaf412e2abd29736\", \"lessThan\": \"d09525720dd5201756f698bee1076de9aefd4602\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5ea8d10802ec4c153a6e21eebaf412e2abd29736\", \"lessThan\": \"c55b2b983b0fa012942c3eb16384b2b722caa810\", \"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\": \"4.14.283\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.247\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.198\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.122\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.47\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17.15\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.17.*\"}, {\"status\": \"unaffected\", \"version\": \"5.18.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.18.*\"}, {\"status\": \"unaffected\", \"version\": \"5.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/block/nbd.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/165cf2e0019fa6cedc75b456490c41494c34abb4\"}, {\"url\": \"https://git.kernel.org/stable/c/2573f2375b64280be977431701ed5d33b75b9ad0\"}, {\"url\": \"https://git.kernel.org/stable/c/8a7da4ced236ce6637fe70f14ca18e718d4bf9e9\"}, {\"url\": \"https://git.kernel.org/stable/c/122e4adaff2439f1cc18cc7e931980fa7560df5c\"}, {\"url\": \"https://git.kernel.org/stable/c/71c142f910da44421213ade601bcbd23ceae19fa\"}, {\"url\": \"https://git.kernel.org/stable/c/2888fa41985f93ed0a6837cfbb06bcbfd7fa2314\"}, {\"url\": \"https://git.kernel.org/stable/c/d09525720dd5201756f698bee1076de9aefd4602\"}, {\"url\": \"https://git.kernel.org/stable/c/c55b2b983b0fa012942c3eb16384b2b722caa810\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnbd: fix race between nbd_alloc_config() and module removal\\n\\nWhen nbd module is being removing, nbd_alloc_config() may be\\ncalled concurrently by nbd_genl_connect(), although try_module_get()\\nwill return false, but nbd_alloc_config() doesn\u0027t handle it.\\n\\nThe race may lead to the leak of nbd_config and its related\\nresources (e.g, recv_workq) and oops in nbd_read_stat() due\\nto the unload of nbd module as shown below:\\n\\n  BUG: kernel NULL pointer dereference, address: 0000000000000040\\n  Oops: 0000 [#1] SMP PTI\\n  CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1\\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\\n  Workqueue: knbd16-recv recv_work [nbd]\\n  RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd]\\n  Call Trace:\\n   recv_work+0x3b/0xb0 [nbd]\\n   process_one_work+0x1ed/0x390\\n   worker_thread+0x4a/0x3d0\\n   kthread+0x12a/0x150\\n   ret_from_fork+0x22/0x30\\n\\nFixing it by checking the return value of try_module_get()\\nin nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV),\\nassign nbd-\u003econfig only when nbd_alloc_config() succeeds to ensure\\nthe value of nbd-\u003econfig is binary (valid or NULL).\\n\\nAlso adding a debug message to check the reference counter\\nof nbd_config during module removal.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.283\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.247\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.198\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.122\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.47\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17.15\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18.4\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19\", \"versionStartIncluding\": \"4.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T18:57:00.337Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49300\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T18:57:00.337Z\", \"dateReserved\": \"2025-02-26T02:08:31.534Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T02:10:35.594Z\", \"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.