cve-2021-47471
Vulnerability from cvelistv5
Published
2024-05-22 06:23
Modified
2024-12-19 07:43
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm: mxsfb: Fix NULL pointer dereference crash on unload The mxsfb->crtc.funcs may already be NULL when unloading the driver, in which case calling mxsfb_irq_disable() via drm_irq_uninstall() from mxsfb_unload() leads to NULL pointer dereference. Since all we care about is masking the IRQ and mxsfb->base is still valid, just use that to clear and mask the IRQ.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472
Impacted products
Vendor Product Version
Linux Linux Version: 5.10
Show details on NVD website

To clipboard 

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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47471\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T07:15:11.847\",\"lastModified\":\"2024-11-21T06:36:14.623\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm: mxsfb: Fix NULL pointer dereference crash on unload\\n\\nThe mxsfb-\u003ecrtc.funcs may already be NULL when unloading the driver,\\nin which case calling mxsfb_irq_disable() via drm_irq_uninstall() from\\nmxsfb_unload() leads to NULL pointer dereference.\\n\\nSince all we care about is masking the IRQ and mxsfb-\u003ebase is still\\nvalid, just use that to clear and mask the IRQ.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: drm: mxsfb: corrige el fallo de desreferencia del puntero NULL al descargar Es posible que mxsfb-\u0026gt;crtc.funcs ya sea NULL al descargar el controlador, en cuyo caso se llama a mxsfb_irq_disable() a trav\u00e9s de drm_irq_uninstall() desde mxsfb_unload() conduce a la desreferencia del puntero NULL. Dado que lo \u00fanico que nos importa es enmascarar la IRQ y mxsfb-\u0026gt;base sigue siendo v\u00e1lido, simplemente util\u00edcelo para borrar y enmascarar la IRQ.\"}],\"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\",\"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}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
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