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CVE-2021-47567 (GCVE-0-2021-47567)

Vulnerability from cvelistv5 – Published: 2024-05-24 15:12 – Updated: 2026-05-23 15:20
VLAI
Title
powerpc/32: Fix hardlockup on vmap stack overflow
Summary
In the Linux kernel, the following vulnerability has been resolved: powerpc/32: Fix hardlockup on vmap stack overflow Since the commit c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not activate MMU before reading task struct") a vmap stack overflow results in a hard lockup. This is because emergency_ctx is still addressed with its virtual address allthough data MMU is not active anymore at that time. Fix it by using a physical address instead.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-17 17:34 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c118c7303ad528be8ff2aea8cd1ee15452c763f0 , < dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7 (git)
Affected: c118c7303ad528be8ff2aea8cd1ee15452c763f0 , < c4e3ff8b8b1d54f0c755670174c453b06e17114b (git)
Affected: c118c7303ad528be8ff2aea8cd1ee15452c763f0 , < 5bb60ea611db1e04814426ed4bd1c95d1487678e (git)
Affected: 3b234b4a6651ed6bdca94553aa0038fc7ded9271 (git)
Affected: 5.9.5 , < 5.10 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.83 , ≤ 5.10.* (semver)
Unaffected: 5.15.6 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/c4e3ff8b8b1d54f0c755670174c453b06e17114b\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/5bb60ea611db1e04814426ed4bd1c95d1487678e\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:39:59.830Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47567\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-17T17:34:28.307539Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-17T17:34:29.564Z\"}}], \"cna\": {\"title\": \"powerpc/32: Fix hardlockup on vmap stack overflow\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"c118c7303ad528be8ff2aea8cd1ee15452c763f0\", \"lessThan\": \"dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c118c7303ad528be8ff2aea8cd1ee15452c763f0\", \"lessThan\": \"c4e3ff8b8b1d54f0c755670174c453b06e17114b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c118c7303ad528be8ff2aea8cd1ee15452c763f0\", \"lessThan\": \"5bb60ea611db1e04814426ed4bd1c95d1487678e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3b234b4a6651ed6bdca94553aa0038fc7ded9271\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.9.5\", \"lessThan\": \"5.10\", \"versionType\": \"semver\"}], \"programFiles\": [\"arch/powerpc/kernel/head_32.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.10\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.83\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"arch/powerpc/kernel/head_32.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7\"}, {\"url\": \"https://git.kernel.org/stable/c/c4e3ff8b8b1d54f0c755670174c453b06e17114b\"}, {\"url\": \"https://git.kernel.org/stable/c/5bb60ea611db1e04814426ed4bd1c95d1487678e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\npowerpc/32: Fix hardlockup on vmap stack overflow\\n\\nSince the commit c118c7303ad5 (\\\"powerpc/32: Fix vmap stack - Do not\\nactivate MMU before reading task struct\\\") a vmap stack overflow\\nresults in a hard lockup. This is because emergency_ctx is still\\naddressed with its virtual address allthough data MMU is not active\\nanymore at that time.\\n\\nFix it by using a physical address instead.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.83\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.6\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.9.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:20:15.825Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47567\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:20:15.825Z\", \"dateReserved\": \"2024-05-24T15:11:00.728Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-24T15:12:54.081Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.