cve-2021-47439
Vulnerability from cvelistv5
Published
2024-05-22 06:19
Modified
2024-11-04 12:05
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
net: dsa: microchip: Added the condition for scheduling ksz_mib_read_work
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/383239a33cf29ebee9ce0d4e0e5c900b77a16148
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef1100ef20f29aec4e62abeccdb5bdbebba1e378
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f2e1de075018cf71bcd7d628e9f759cb8540b0c3
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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              "userInteraction": "NONE",
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                "timestamp": "2024-05-29T18:42:32.231853Z",
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    "dateReserved": "2024-05-21T14:58:30.831Z",
    "dateUpdated": "2024-11-04T12:05:55.266Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47439\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T07:15:09.163\",\"lastModified\":\"2024-10-31T18:35:01.573\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: dsa: microchip: Added the condition for scheduling ksz_mib_read_work\\n\\nWhen the ksz module is installed and removed using rmmod, kernel crashes\\nwith null pointer dereferrence error. During rmmod, ksz_switch_remove\\nfunction tries to cancel the mib_read_workqueue using\\ncancel_delayed_work_sync routine and unregister switch from dsa.\\n\\nDuring dsa_unregister_switch it calls ksz_mac_link_down, which in turn\\nreschedules the workqueue since mib_interval is non-zero.\\nDue to which queue executed after mib_interval and it tries to access\\ndp-\u003eslave. But the slave is unregistered in the ksz_switch_remove\\nfunction. Hence kernel crashes.\\n\\nTo avoid this crash, before canceling the workqueue, resetted the\\nmib_interval to 0.\\n\\nv1 -\u003e v2:\\n-Removed the if condition in ksz_mib_read_work\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: dsa: microchip: se agreg\u00f3 la condici\u00f3n para programar ksz_mib_read_work Cuando el m\u00f3dulo ksz se instala y elimina usando rmmod, el kernel falla con un error de desreferencia de puntero nulo. Durante rmmod, la funci\u00f3n ksz_switch_remove intenta cancelar mib_read_workqueue usando la rutina cancel_delayed_work_sync y cancelar el registro del conmutador de dsa. Durante dsa_unregister_switch llama a ksz_mac_link_down, que a su vez reprograma la cola de trabajo ya que mib_interval no es cero. Debido a qu\u00e9 cola se ejecut\u00f3 despu\u00e9s de mib_interval e intenta acceder a dp-\u0026gt;slave. Pero el esclavo no est\u00e1 registrado en la funci\u00f3n ksz_switch_remove. Por lo tanto, el kernel falla. Para evitar este bloqueo, antes de cancelar la cola de trabajo, restableci\u00f3 mib_interval a 0. v1 -\u0026gt; v2: -Se elimin\u00f3 la condici\u00f3n if en ksz_mib_read_work\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/383239a33cf29ebee9ce0d4e0e5c900b77a16148\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ef1100ef20f29aec4e62abeccdb5bdbebba1e378\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f2e1de075018cf71bcd7d628e9f759cb8540b0c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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