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CVE-2024-36478 (GCVE-0-2024-36478)

Vulnerability from cvelistv5 – Published: 2024-06-21 10:18 – Updated: 2026-05-11 20:16
VLAI
Title
null_blk: fix null-ptr-dereference while configuring 'power' and 'submit_queues'
Summary
In the Linux kernel, the following vulnerability has been resolved: null_blk: fix null-ptr-dereference while configuring 'power' and 'submit_queues' Writing 'power' and 'submit_queues' concurrently will trigger kernel panic: Test script: modprobe null_blk nr_devices=0 mkdir -p /sys/kernel/config/nullb/nullb0 while true; do echo 1 > submit_queues; echo 4 > submit_queues; done & while true; do echo 1 > power; echo 0 > power; done Test result: BUG: kernel NULL pointer dereference, address: 0000000000000148 Oops: 0000 [#1] PREEMPT SMP RIP: 0010:__lock_acquire+0x41d/0x28f0 Call Trace: <TASK> lock_acquire+0x121/0x450 down_write+0x5f/0x1d0 simple_recursive_removal+0x12f/0x5c0 blk_mq_debugfs_unregister_hctxs+0x7c/0x100 blk_mq_update_nr_hw_queues+0x4a3/0x720 nullb_update_nr_hw_queues+0x71/0xf0 [null_blk] nullb_device_submit_queues_store+0x79/0xf0 [null_blk] configfs_write_iter+0x119/0x1e0 vfs_write+0x326/0x730 ksys_write+0x74/0x150 This is because del_gendisk() can concurrent with blk_mq_update_nr_hw_queues(): nullb_device_power_store nullb_apply_submit_queues null_del_dev del_gendisk nullb_update_nr_hw_queues if (!dev->nullb) // still set while gendisk is deleted return 0 blk_mq_update_nr_hw_queues dev->nullb = NULL Fix this problem by resuing the global mutex to protect nullb_device_power_store() and nullb_update_nr_hw_queues() from configfs.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:09 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 45919fbfe1c487c17ea1d198534339a5e8abeae3 , < 1d4c8baef435c98e8d5aa7027dc5a9f70834ba16 (git)
Affected: 45919fbfe1c487c17ea1d198534339a5e8abeae3 , < aaadb755f2d684f715a6eb85cb7243aa0c67dfa9 (git)
Affected: 45919fbfe1c487c17ea1d198534339a5e8abeae3 , < 5d0495473ee4c1d041b5a917f10446a22c047f47 (git)
Affected: 45919fbfe1c487c17ea1d198534339a5e8abeae3 , < a2db328b0839312c169eb42746ec46fc1ab53ed2 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 6.1.119 , ≤ 6.1.* (semver)
Unaffected: 6.6.55 , ≤ 6.6.* (semver)
Unaffected: 6.9.4 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnull_blk: fix null-ptr-dereference while configuring \u0027power\u0027 and \u0027submit_queues\u0027\\n\\nWriting \u0027power\u0027 and \u0027submit_queues\u0027 concurrently will trigger kernel\\npanic:\\n\\nTest script:\\n\\nmodprobe null_blk nr_devices=0\\nmkdir -p /sys/kernel/config/nullb/nullb0\\nwhile true; do echo 1 \u003e submit_queues; echo 4 \u003e submit_queues; done \u0026\\nwhile true; do echo 1 \u003e power; echo 0 \u003e power; done\\n\\nTest result:\\n\\nBUG: kernel NULL pointer dereference, address: 0000000000000148\\nOops: 0000 [#1] PREEMPT SMP\\nRIP: 0010:__lock_acquire+0x41d/0x28f0\\nCall Trace:\\n \u003cTASK\u003e\\n lock_acquire+0x121/0x450\\n down_write+0x5f/0x1d0\\n simple_recursive_removal+0x12f/0x5c0\\n blk_mq_debugfs_unregister_hctxs+0x7c/0x100\\n blk_mq_update_nr_hw_queues+0x4a3/0x720\\n nullb_update_nr_hw_queues+0x71/0xf0 [null_blk]\\n nullb_device_submit_queues_store+0x79/0xf0 [null_blk]\\n configfs_write_iter+0x119/0x1e0\\n vfs_write+0x326/0x730\\n ksys_write+0x74/0x150\\n\\nThis is because del_gendisk() can concurrent with\\nblk_mq_update_nr_hw_queues():\\n\\nnullb_device_power_store\\tnullb_apply_submit_queues\\n null_del_dev\\n del_gendisk\\n\\t\\t\\t\\t nullb_update_nr_hw_queues\\n\\t\\t\\t\\t  if (!dev-\u003enullb)\\n\\t\\t\\t\\t  // still set while gendisk is deleted\\n\\t\\t\\t\\t   return 0\\n\\t\\t\\t\\t  blk_mq_update_nr_hw_queues\\n dev-\u003enullb = NULL\\n\\nFix this problem by resuing the global mutex to protect\\nnullb_device_power_store() and nullb_update_nr_hw_queues() from configfs.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: null_blk: corrige la dereferencia null-ptr al configurar \u0027power\u0027 y \u0027submit_queues\u0027. Escribir \u0027power\u0027 y \u0027submit_queues\u0027 simult\\u00e1neamente provocar\\u00e1 un p\\u00e1nico en el kernel: Script de prueba: modprobe null_blk nr_devices= 0 mkdir -p /sys/kernel/config/nullb/nullb0 mientras sea verdadero; hacer eco 1 \u0026gt; enviar_queues; eco 4 \u0026gt; enviar_colas; hecho y mientras sea cierto; hacer eco 1 \u0026gt; potencia; eco 0 \u0026gt; potencia; hecho Resultado de la prueba: ERROR: desreferencia del puntero NULL del kernel, direcci\\u00f3n: 0000000000000148 Ups: 0000 [#1] RIP SMP PREEMPLEADO: 0010:__lock_acquire+0x41d/0x28f0 Seguimiento de llamada:  lock_acquire+0x121/0x450 down_write+0x5f/0x1d0 simple_recursive _eliminaci\\u00f3n+ 0x12f/0x5c0 blk_mq_debugfs_unregister_hctxs+0x7c/0x100 blk_mq_update_nr_hw_queues+0x4a3/0x720 nullb_update_nr_hw_queues+0x71/0xf0 [null_blk] /0xf0 [null_blk] configfs_write_iter+0x119/0x1e0 vfs_write+0x326/0x730 ksys_write+0x74/0x150 Esto se debe a que del_gendisk() puede concurrente con blk_mq_update_nr_hw_queues(): nullb_device_power_store nullb_apply_submit_queues null_del_dev del_gendisk nullb_update_nr_hw_queues if (!dev-\u0026gt;nullb) // todav\\u00eda est\\u00e1 configurado mientras se elimina gendisk return 0 blk_mq_update_nr_hw_queues dev-\u0026gt;nullb = NULL Fix este problema reutilizando el mutex global para proteger nullb_device_power_store() y nullb_update_nr_hw_queues() de configfs.\"}]",
      "id": "CVE-2024-36478",
      "lastModified": "2024-12-02T08:15:05.787",
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      "source": "Microsoft CSAF VEX",
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      "title": "null_blk: fix null-ptr-dereference while configuring \u0027power\u0027 and \u0027submit_queues\u0027",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-36478\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-21T11:15:10.360\",\"lastModified\":\"2026-06-17T07:36:48.410\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnull_blk: fix null-ptr-dereference while configuring \u0027power\u0027 and \u0027submit_queues\u0027\\n\\nWriting \u0027power\u0027 and \u0027submit_queues\u0027 concurrently will trigger kernel\\npanic:\\n\\nTest script:\\n\\nmodprobe null_blk nr_devices=0\\nmkdir -p /sys/kernel/config/nullb/nullb0\\nwhile true; do echo 1 \u003e submit_queues; echo 4 \u003e submit_queues; done \u0026\\nwhile true; do echo 1 \u003e power; echo 0 \u003e power; done\\n\\nTest result:\\n\\nBUG: kernel NULL pointer dereference, address: 0000000000000148\\nOops: 0000 [#1] PREEMPT SMP\\nRIP: 0010:__lock_acquire+0x41d/0x28f0\\nCall Trace:\\n \u003cTASK\u003e\\n lock_acquire+0x121/0x450\\n down_write+0x5f/0x1d0\\n simple_recursive_removal+0x12f/0x5c0\\n blk_mq_debugfs_unregister_hctxs+0x7c/0x100\\n blk_mq_update_nr_hw_queues+0x4a3/0x720\\n nullb_update_nr_hw_queues+0x71/0xf0 [null_blk]\\n nullb_device_submit_queues_store+0x79/0xf0 [null_blk]\\n configfs_write_iter+0x119/0x1e0\\n vfs_write+0x326/0x730\\n ksys_write+0x74/0x150\\n\\nThis is because del_gendisk() can concurrent with\\nblk_mq_update_nr_hw_queues():\\n\\nnullb_device_power_store\\tnullb_apply_submit_queues\\n null_del_dev\\n del_gendisk\\n\\t\\t\\t\\t nullb_update_nr_hw_queues\\n\\t\\t\\t\\t  if (!dev-\u003enullb)\\n\\t\\t\\t\\t  // still set while gendisk is deleted\\n\\t\\t\\t\\t   return 0\\n\\t\\t\\t\\t  blk_mq_update_nr_hw_queues\\n dev-\u003enullb = NULL\\n\\nFix this problem by resuing the global mutex to protect\\nnullb_device_power_store() and nullb_update_nr_hw_queues() from configfs.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: null_blk: corrige la dereferencia null-ptr al configurar \u0027power\u0027 y \u0027submit_queues\u0027. Escribir \u0027power\u0027 y \u0027submit_queues\u0027 simult\u00e1neamente provocar\u00e1 un p\u00e1nico en el kernel: Script de prueba: modprobe null_blk nr_devices= 0 mkdir -p /sys/kernel/config/nullb/nullb0 mientras sea verdadero; hacer eco 1 \u0026gt; enviar_queues; eco 4 \u0026gt; enviar_colas; hecho y mientras sea cierto; hacer eco 1 \u0026gt; potencia; eco 0 \u0026gt; potencia; hecho Resultado de la prueba: ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000148 Ups: 0000 [#1] RIP SMP PREEMPLEADO: 0010:__lock_acquire+0x41d/0x28f0 Seguimiento de llamada:  lock_acquire+0x121/0x450 down_write+0x5f/0x1d0 simple_recursive _eliminaci\u00f3n+ 0x12f/0x5c0 blk_mq_debugfs_unregister_hctxs+0x7c/0x100 blk_mq_update_nr_hw_queues+0x4a3/0x720 nullb_update_nr_hw_queues+0x71/0xf0 [null_blk] /0xf0 [null_blk] configfs_write_iter+0x119/0x1e0 vfs_write+0x326/0x730 ksys_write+0x74/0x150 Esto se debe a que del_gendisk() puede concurrente con blk_mq_update_nr_hw_queues(): nullb_device_power_store nullb_apply_submit_queues null_del_dev del_gendisk nullb_update_nr_hw_queues if (!dev-\u0026gt;nullb) // todav\u00eda est\u00e1 configurado mientras se elimina gendisk return 0 blk_mq_update_nr_hw_queues dev-\u0026gt;nullb = NULL Fix este problema reutilizando el mutex global para proteger nullb_device_power_store() y nullb_update_nr_hw_queues() de configfs.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/block/null_blk/main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"45919fbfe1c487c17ea1d198534339a5e8abeae3\",\"lessThan\":\"1d4c8baef435c98e8d5aa7027dc5a9f70834ba16\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"45919fbfe1c487c17ea1d198534339a5e8abeae3\",\"lessThan\":\"aaadb755f2d684f715a6eb85cb7243aa0c67dfa9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"45919fbfe1c487c17ea1d198534339a5e8abeae3\",\"lessThan\":\"5d0495473ee4c1d041b5a917f10446a22c047f47\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"45919fbfe1c487c17ea1d198534339a5e8abeae3\",\"lessThan\":\"a2db328b0839312c169eb42746ec46fc1ab53ed2\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/block/null_blk/main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.5\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.119\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.55\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.9.4\",\"lessThanOrEqual\":\"6.9.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.10\",\"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:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-09-10T17:09:31.490057Z\",\"id\":\"CVE-2024-36478\",\"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-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"6.9.4\",\"matchCriteriaId\":\"BA9EDDA6-4A33-4936-9152-D0D896107EF8\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1d4c8baef435c98e8d5aa7027dc5a9f70834ba16\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d0495473ee4c1d041b5a917f10446a22c047f47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a2db328b0839312c169eb42746ec46fc1ab53ed2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/aaadb755f2d684f715a6eb85cb7243aa0c67dfa9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d0495473ee4c1d041b5a917f10446a22c047f47\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a2db328b0839312c169eb42746ec46fc1ab53ed2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:39:27+00:00",
      "cve": "CVE-2024-36478",
      "id": "CVE-2024-36478",
      "initial_release_date": "2024-06-21T00:00:00+00:00",
      "product_status:known_affected": "48",
      "product_status:known_not_affected": "150",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: null_blk: fix null-ptr-dereference while configuring \u0026#39;power\u0026#39; and \u0026#39;submit_queues\u0026#39;",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-36478.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-02T01:30:20Z",
      "cve": "CVE-2024-36478",
      "id": "CVE-2024-36478",
      "initial_release_date": "2024-06-24T23:17:06Z",
      "product_status:known_affected": "468",
      "product_status:known_not_affected": "176",
      "product_status:recommended": "651",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-36478",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-36478.json",
      "version": "85"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5d0495473ee4c1d041b5a917f10446a22c047f47\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/a2db328b0839312c169eb42746ec46fc1ab53ed2\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T21:55:17.674Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-36478\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T17:09:31.490057Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:25.705Z\"}}], \"cna\": {\"title\": \"null_blk: fix null-ptr-dereference while configuring \u0027power\u0027 and \u0027submit_queues\u0027\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"45919fbfe1c487c17ea1d198534339a5e8abeae3\", \"lessThan\": \"1d4c8baef435c98e8d5aa7027dc5a9f70834ba16\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"45919fbfe1c487c17ea1d198534339a5e8abeae3\", \"lessThan\": \"aaadb755f2d684f715a6eb85cb7243aa0c67dfa9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"45919fbfe1c487c17ea1d198534339a5e8abeae3\", \"lessThan\": \"5d0495473ee4c1d041b5a917f10446a22c047f47\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"45919fbfe1c487c17ea1d198534339a5e8abeae3\", \"lessThan\": \"a2db328b0839312c169eb42746ec46fc1ab53ed2\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/block/null_blk/main.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.119\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.55\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/block/null_blk/main.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1d4c8baef435c98e8d5aa7027dc5a9f70834ba16\"}, {\"url\": \"https://git.kernel.org/stable/c/aaadb755f2d684f715a6eb85cb7243aa0c67dfa9\"}, {\"url\": \"https://git.kernel.org/stable/c/5d0495473ee4c1d041b5a917f10446a22c047f47\"}, {\"url\": \"https://git.kernel.org/stable/c/a2db328b0839312c169eb42746ec46fc1ab53ed2\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnull_blk: fix null-ptr-dereference while configuring \u0027power\u0027 and \u0027submit_queues\u0027\\n\\nWriting \u0027power\u0027 and \u0027submit_queues\u0027 concurrently will trigger kernel\\npanic:\\n\\nTest script:\\n\\nmodprobe null_blk nr_devices=0\\nmkdir -p /sys/kernel/config/nullb/nullb0\\nwhile true; do echo 1 \u003e submit_queues; echo 4 \u003e submit_queues; done \u0026\\nwhile true; do echo 1 \u003e power; echo 0 \u003e power; done\\n\\nTest result:\\n\\nBUG: kernel NULL pointer dereference, address: 0000000000000148\\nOops: 0000 [#1] PREEMPT SMP\\nRIP: 0010:__lock_acquire+0x41d/0x28f0\\nCall Trace:\\n \u003cTASK\u003e\\n lock_acquire+0x121/0x450\\n down_write+0x5f/0x1d0\\n simple_recursive_removal+0x12f/0x5c0\\n blk_mq_debugfs_unregister_hctxs+0x7c/0x100\\n blk_mq_update_nr_hw_queues+0x4a3/0x720\\n nullb_update_nr_hw_queues+0x71/0xf0 [null_blk]\\n nullb_device_submit_queues_store+0x79/0xf0 [null_blk]\\n configfs_write_iter+0x119/0x1e0\\n vfs_write+0x326/0x730\\n ksys_write+0x74/0x150\\n\\nThis is because del_gendisk() can concurrent with\\nblk_mq_update_nr_hw_queues():\\n\\nnullb_device_power_store\\tnullb_apply_submit_queues\\n null_del_dev\\n del_gendisk\\n\\t\\t\\t\\t nullb_update_nr_hw_queues\\n\\t\\t\\t\\t  if (!dev-\u003enullb)\\n\\t\\t\\t\\t  // still set while gendisk is deleted\\n\\t\\t\\t\\t   return 0\\n\\t\\t\\t\\t  blk_mq_update_nr_hw_queues\\n dev-\u003enullb = NULL\\n\\nFix this problem by resuing the global mutex to protect\\nnullb_device_power_store() and nullb_update_nr_hw_queues() from configfs.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.119\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.55\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.4\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"5.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:11:07.932Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-36478\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T21:55:17.674Z\", \"dateReserved\": \"2024-06-21T10:13:16.284Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-21T10:18:09.027Z\", \"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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  • 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.
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  • 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.


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