{"id":"CVE-2021-47471","state":"PUBLISHED","title":"drm: mxsfb: Fix NULL pointer dereference crash on unload","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: mxsfb: Fix NULL pointer dereference crash on unload\n\nThe mxsfb->crtc.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->base is still\nvalid, just use that to clear and mask the IRQ.","publishedAt":"2024-05-22T06:23:28.903Z","updatedAt":"2026-05-11T13:55:20.762Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ae1ed0093281939b80664a687689f12436c0e874","status":"affected","lessThan":"f40c2281d2c0674d32ba732fee45222d76495472","versionType":"git"},{"version":"ae1ed0093281939b80664a687689f12436c0e874","status":"affected","lessThan":"b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8","versionType":"git"},{"version":"ae1ed0093281939b80664a687689f12436c0e874","status":"affected","lessThan":"3cfc183052c3dbf8eae57b6c1685dab00ed3db4a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/mxsfb/mxsfb_drv.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.76","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.14.15","status":"unaffected","lessThanOrEqual":"5.14.*","versionType":"semver"},{"version":"5.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/mxsfb/mxsfb_drv.c"]}],"references":["https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472","https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8","https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47471.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47471","state":"PUBLISHED","datePublished":"2024-05-22T06:23:28.903Z","dateUpdated":"2026-05-11T13:55:20.762Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-22T06:20:56.199Z"},"containers":{"cna":{"title":"drm: mxsfb: Fix NULL pointer dereference crash on unload","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->crtc.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->base is still\nvalid, just use that to clear and mask the IRQ."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ae1ed0093281939b80664a687689f12436c0e874","status":"affected","lessThan":"f40c2281d2c0674d32ba732fee45222d76495472","versionType":"git"},{"version":"ae1ed0093281939b80664a687689f12436c0e874","status":"affected","lessThan":"b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8","versionType":"git"},{"version":"ae1ed0093281939b80664a687689f12436c0e874","status":"affected","lessThan":"3cfc183052c3dbf8eae57b6c1685dab00ed3db4a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/mxsfb/mxsfb_drv.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.76","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.14.15","status":"unaffected","lessThanOrEqual":"5.14.*","versionType":"semver"},{"version":"5.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/mxsfb/mxsfb_drv.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472"},{"url":"https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8"},{"url":"https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:55:20.762Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.10.76"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.14.15"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.15"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2024-05-29T18:40:54.294735Z","id":"CVE-2021-47471","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","type":"CWE","lang":"en","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-10-31T15:35:16.391Z"}},{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:39:59.405Z"}}]}}}