{"id":"CVE-2021-47631","state":"PUBLISHED","title":"ARM: davinci: da850-evm: Avoid NULL pointer dereference","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nARM: davinci: da850-evm: Avoid NULL pointer dereference\n\nWith newer versions of GCC, there is a panic in da850_evm_config_emac()\nwhen booting multi_v5_defconfig in QEMU under the palmetto-bmc machine:\n\nUnable to handle kernel NULL pointer dereference at virtual address 00000020\npgd = (ptrval)\n[00000020] *pgd=00000000\nInternal error: Oops: 5 [#1] PREEMPT ARM\nModules linked in:\nCPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1\nHardware name: Generic DT based system\nPC is at da850_evm_config_emac+0x1c/0x120\nLR is at do_one_initcall+0x50/0x1e0\n\nThe emac_pdata pointer in soc_info is NULL because davinci_soc_info only\ngets populated on davinci machines but da850_evm_config_emac() is called\non all machines via device_initcall().\n\nMove the rmii_en assignment below the machine check so that it is only\ndereferenced when running on a supported SoC.","publishedAt":"2025-02-26T01:54:07.513Z","updatedAt":"2026-05-11T13:58:07.851Z","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":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"c06f476e5b74bcabb8c4a2fba55864a37e62843b","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"a12b356d45cbb6e8a1b718d1436b3d6239a862f3","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"c64e2ed5cc376e137e572babfd2edc38b2cfb61b","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"89931d4762572aaee6edbe5673d41f8082de110f","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"0a312ec66a03133d28570f07bc52749ccfef54da","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"0940795c6834fbe7705acc5c3d4b2f7a5f67527a","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"c5628533a3ece64235d04fe11ec44d2be99e423d","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"83a1cde5c74bfb44b49cb2a940d044bb2380f4ea","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm/mach-davinci/board-da850-evm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.33","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.33","versionType":"semver"},{"version":"4.9.311","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.276","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.239","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.190","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.112","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.35","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.17.4","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm/mach-davinci/board-da850-evm.c"]}],"references":["https://git.kernel.org/stable/c/c06f476e5b74bcabb8c4a2fba55864a37e62843b","https://git.kernel.org/stable/c/a12b356d45cbb6e8a1b718d1436b3d6239a862f3","https://git.kernel.org/stable/c/c64e2ed5cc376e137e572babfd2edc38b2cfb61b","https://git.kernel.org/stable/c/89931d4762572aaee6edbe5673d41f8082de110f","https://git.kernel.org/stable/c/0a312ec66a03133d28570f07bc52749ccfef54da","https://git.kernel.org/stable/c/0940795c6834fbe7705acc5c3d4b2f7a5f67527a","https://git.kernel.org/stable/c/c5628533a3ece64235d04fe11ec44d2be99e423d","https://git.kernel.org/stable/c/83a1cde5c74bfb44b49cb2a940d044bb2380f4ea"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47631.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47631","state":"PUBLISHED","datePublished":"2025-02-26T01:54:07.513Z","dateUpdated":"2026-05-11T13:58:07.851Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-02-26T01:48:21.518Z"},"containers":{"cna":{"title":"ARM: davinci: da850-evm: Avoid NULL pointer dereference","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nARM: davinci: da850-evm: Avoid NULL pointer dereference\n\nWith newer versions of GCC, there is a panic in da850_evm_config_emac()\nwhen booting multi_v5_defconfig in QEMU under the palmetto-bmc machine:\n\nUnable to handle kernel NULL pointer dereference at virtual address 00000020\npgd = (ptrval)\n[00000020] *pgd=00000000\nInternal error: Oops: 5 [#1] PREEMPT ARM\nModules linked in:\nCPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1\nHardware name: Generic DT based system\nPC is at da850_evm_config_emac+0x1c/0x120\nLR is at do_one_initcall+0x50/0x1e0\n\nThe emac_pdata pointer in soc_info is NULL because davinci_soc_info only\ngets populated on davinci machines but da850_evm_config_emac() is called\non all machines via device_initcall().\n\nMove the rmii_en assignment below the machine check so that it is only\ndereferenced when running on a supported SoC."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"c06f476e5b74bcabb8c4a2fba55864a37e62843b","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"a12b356d45cbb6e8a1b718d1436b3d6239a862f3","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"c64e2ed5cc376e137e572babfd2edc38b2cfb61b","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"89931d4762572aaee6edbe5673d41f8082de110f","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"0a312ec66a03133d28570f07bc52749ccfef54da","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"0940795c6834fbe7705acc5c3d4b2f7a5f67527a","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"c5628533a3ece64235d04fe11ec44d2be99e423d","versionType":"git"},{"version":"bae105879f2f2404155da6f50b3636193d228a62","status":"affected","lessThan":"83a1cde5c74bfb44b49cb2a940d044bb2380f4ea","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm/mach-davinci/board-da850-evm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.33","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.33","versionType":"semver"},{"version":"4.9.311","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.276","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.239","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.190","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.112","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.35","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.17.4","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm/mach-davinci/board-da850-evm.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c06f476e5b74bcabb8c4a2fba55864a37e62843b"},{"url":"https://git.kernel.org/stable/c/a12b356d45cbb6e8a1b718d1436b3d6239a862f3"},{"url":"https://git.kernel.org/stable/c/c64e2ed5cc376e137e572babfd2edc38b2cfb61b"},{"url":"https://git.kernel.org/stable/c/89931d4762572aaee6edbe5673d41f8082de110f"},{"url":"https://git.kernel.org/stable/c/0a312ec66a03133d28570f07bc52749ccfef54da"},{"url":"https://git.kernel.org/stable/c/0940795c6834fbe7705acc5c3d4b2f7a5f67527a"},{"url":"https://git.kernel.org/stable/c/c5628533a3ece64235d04fe11ec44d2be99e423d"},{"url":"https://git.kernel.org/stable/c/83a1cde5c74bfb44b49cb2a940d044bb2380f4ea"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:58:07.851Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"4.9.311"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"4.14.276"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"4.19.239"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"5.4.190"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"5.10.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"5.15.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"5.17.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"5.18"}]}]}],"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":{"id":"CVE-2021-47631","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T19:51:01.274417Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","type":"CWE","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T19:57:09.062Z"}}]}}}