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CVE-2021-47631 (GCVE-0-2021-47631)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2026-05-11 13:58
VLAI
Title
ARM: davinci: da850-evm: Avoid NULL pointer dereference
Summary
In the Linux kernel, the following vulnerability has been resolved: ARM: davinci: da850-evm: Avoid NULL pointer dereference With newer versions of GCC, there is a panic in da850_evm_config_emac() when booting multi_v5_defconfig in QEMU under the palmetto-bmc machine: Unable to handle kernel NULL pointer dereference at virtual address 00000020 pgd = (ptrval) [00000020] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT ARM Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1 Hardware name: Generic DT based system PC is at da850_evm_config_emac+0x1c/0x120 LR is at do_one_initcall+0x50/0x1e0 The emac_pdata pointer in soc_info is NULL because davinci_soc_info only gets populated on davinci machines but da850_evm_config_emac() is called on all machines via device_initcall(). Move the rmii_en assignment below the machine check so that it is only dereferenced when running on a supported SoC.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:51 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bae105879f2f2404155da6f50b3636193d228a62 , < c06f476e5b74bcabb8c4a2fba55864a37e62843b (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < a12b356d45cbb6e8a1b718d1436b3d6239a862f3 (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < c64e2ed5cc376e137e572babfd2edc38b2cfb61b (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < 89931d4762572aaee6edbe5673d41f8082de110f (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < 0a312ec66a03133d28570f07bc52749ccfef54da (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < 0940795c6834fbe7705acc5c3d4b2f7a5f67527a (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < c5628533a3ece64235d04fe11ec44d2be99e423d (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < 83a1cde5c74bfb44b49cb2a940d044bb2380f4ea (git)
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Linux Linux Affected: 2.6.33
Unaffected: 0 , < 2.6.33 (semver)
Unaffected: 4.9.311 , ≤ 4.9.* (semver)
Unaffected: 4.14.276 , ≤ 4.14.* (semver)
Unaffected: 4.19.239 , ≤ 4.19.* (semver)
Unaffected: 5.4.190 , ≤ 5.4.* (semver)
Unaffected: 5.10.112 , ≤ 5.10.* (semver)
Unaffected: 5.15.35 , ≤ 5.15.* (semver)
Unaffected: 5.17.4 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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Mueva la asignaci\u00f3n rmii_en debajo de la verificaci\u00f3n de la m\u00e1quina para que solo se desreferencia cuando se ejecuta en un SoC compatible.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/arm/mach-davinci/board-da850-evm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"bae105879f2f2404155da6f50b3636193d228a62\",\"lessThan\":\"c06f476e5b74bcabb8c4a2fba55864a37e62843b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bae105879f2f2404155da6f50b3636193d228a62\",\"lessThan\":\"a12b356d45cbb6e8a1b718d1436b3d6239a862f3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bae105879f2f2404155da6f50b3636193d228a62\",\"lessThan\":\"c64e2ed5cc376e137e572babfd2edc38b2cfb61b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bae105879f2f2404155da6f50b3636193d228a62\",\"lessThan\":\"89931d4762572aaee6edbe5673d41f8082de110f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bae105879f2f2404155da6f50b3636193d228a62\",\"lessThan\":\"0a312ec66a03133d28570f07bc52749ccfef54da\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bae105879f2f2404155da6f50b3636193d228a62\",\"lessThan\":\"0940795c6834fbe7705acc5c3d4b2f7a5f67527a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bae105879f2f2404155da6f50b3636193d228a62\",\"lessThan\":\"c5628533a3ece64235d04fe11ec44d2be99e423d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bae105879f2f2404155da6f50b3636193d228a62\",\"lessThan\":\"83a1cde5c74bfb44b49cb2a940d044bb2380f4ea\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/arm/mach-davinci/board-da850-evm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.33\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.33\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.9.311\",\"lessThanOrEqual\":\"4.9.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.276\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.239\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.190\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.112\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.35\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.17.4\",\"lessThanOrEqual\":\"5.17.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.18\",\"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},{\"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}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2025-10-01T19:51:01.274417Z\",\"id\":\"CVE-2021-47631\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T22:44:35+00:00",
      "cve": "CVE-2021-47631",
      "id": "CVE-2021-47631",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ARM: davinci: da850-evm: Avoid NULL pointer dereference",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47631.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-01T01:35:26Z",
      "cve": "CVE-2021-47631",
      "id": "CVE-2021-47631",
      "initial_release_date": "2025-02-27T03:14:31Z",
      "product_status:known_affected": "334",
      "product_status:known_not_affected": "371",
      "product_status:recommended": "293",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47631",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47631.json",
      "version": "37"
    }
  }
}



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Taxonomy of the tags.





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

Author Source Type Date Other

Nomenclature

  • 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.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • 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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.