CVE-2021-47203 (GCVE-0-2021-47203)

Vulnerability from cvelistv5 – Published: 2024-04-10 18:56 – Updated: 2026-08-05 08:46
VLAI
Title
scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq() When parsing the txq list in lpfc_drain_txq(), the driver attempts to pass the requests to the adapter. If such an attempt fails, a local "fail_msg" string is set and a log message output. The job is then added to a completions list for cancellation. Processing of any further jobs from the txq list continues, but since "fail_msg" remains set, jobs are added to the completions list regardless of whether a wqe was passed to the adapter. If successfully added to txcmplq, jobs are added to both lists resulting in list corruption. Fix by clearing the fail_msg string after adding a job to the completions list. This stops the subsequent jobs from being added to the completions list unless they had an appropriate failure.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984 , < ad4776b5eb2e58af1226847fcd3b4f6d051674dd (git)
Affected: 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984 , < ec70d80a8642900086447ba0cdc79e3f44d42e8f (git)
Affected: 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984 , < f05a0191b90156e539cccc189b9d87ca2a4d9305 (git)
Affected: 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984 , < b291d147d0268e93ad866f8bc820ea14497abc9b (git)
Affected: 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984 , < 16bcbfb56d759c25665f786e33ec633b9508a08f (git)
Affected: 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984 , < c097bd5a59162156d9c2077a2f58732ffbaa9fca (git)
Affected: 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984 , < 814d3610c4ce86e8cf285b2cdac0057a42e82de5 (git)
Affected: 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984 , < 99154581b05c8fb22607afb7c3d66c1bace6aa5d (git)
Create a notification for this product.
Linux Linux Affected: 2.6.36
Unaffected: 0 , < 2.6.36 (semver)
Unaffected: 4.4.293 , ≤ 4.4.* (semver)
Unaffected: 4.9.291 , ≤ 4.9.* (semver)
Unaffected: 4.14.256 , ≤ 4.14.* (semver)
Unaffected: 4.19.218 , ≤ 4.19.* (semver)
Unaffected: 5.4.162 , ≤ 5.4.* (semver)
Unaffected: 5.10.82 , ≤ 5.10.* (semver)
Unaffected: 5.15.5 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47203\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-10T19:15:48.217\",\"lastModified\":\"2026-08-04T10:16:52.533\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nscsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()\\n\\nWhen parsing the txq list in lpfc_drain_txq(), the driver attempts to pass\\nthe requests to the adapter. If such an attempt fails, a local \\\"fail_msg\\\"\\nstring is set and a log message output.  The job is then added to a\\ncompletions list for cancellation.\\n\\nProcessing of any further jobs from the txq list continues, but since\\n\\\"fail_msg\\\" remains set, jobs are added to the completions list regardless\\nof whether a wqe was passed to the adapter.  If successfully added to\\ntxcmplq, jobs are added to both lists resulting in list corruption.\\n\\nFix by clearing the fail_msg string after adding a job to the completions\\nlist. This stops the subsequent jobs from being added to the completions\\nlist unless they had an appropriate failure.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: lpfc: Se corrige la corrupci\u00f3n de list_add() en lpfc_drain_txq() Al analizar la lista txq en lpfc_drain_txq(), el controlador intenta pasar las solicitudes al adaptador. Si dicho intento falla, se establece una cadena \\\"fail_msg\\\" local y se genera un mensaje de registro. Luego, el trabajo se agrega a una lista de finalizaciones para su cancelaci\u00f3n. El procesamiento de cualquier otro trabajo de la lista txq contin\u00faa, pero como \\\"fail_msg\\\" permanece establecido, los trabajos se agregan a la lista de finalizaciones independientemente de si se pas\u00f3 un wqe al adaptador. Si se agrega correctamente a txcmplq, los trabajos se agregan a ambas listas, lo que da como resultado la corrupci\u00f3n de la lista. Se soluciona borrando la cadena fail_msg despu\u00e9s de agregar un trabajo a la lista de finalizaciones. Esto evita que los trabajos posteriores se agreguen a la lista de finalizaciones a menos que hayan tenido una falla apropiada.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/scsi/lpfc/lpfc_sli.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\",\"lessThan\":\"ad4776b5eb2e58af1226847fcd3b4f6d051674dd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\",\"lessThan\":\"ec70d80a8642900086447ba0cdc79e3f44d42e8f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\",\"lessThan\":\"f05a0191b90156e539cccc189b9d87ca2a4d9305\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\",\"lessThan\":\"b291d147d0268e93ad866f8bc820ea14497abc9b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\",\"lessThan\":\"16bcbfb56d759c25665f786e33ec633b9508a08f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\",\"lessThan\":\"c097bd5a59162156d9c2077a2f58732ffbaa9fca\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\",\"lessThan\":\"814d3610c4ce86e8cf285b2cdac0057a42e82de5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\",\"lessThan\":\"99154581b05c8fb22607afb7c3d66c1bace6aa5d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/scsi/lpfc/lpfc_sli.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.36\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.36\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.4.293\",\"lessThanOrEqual\":\"4.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.9.291\",\"lessThanOrEqual\":\"4.9.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.256\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.218\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.162\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.82\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.5\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.16\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9},{\"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}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-04-10T19:44:44.009129Z\",\"id\":\"CVE-2021-47203\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T20:02:40+00:00",
      "cve": "CVE-2021-47203",
      "id": "CVE-2021-47203",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:fixed": "120",
      "product_status:known_affected": "58",
      "product_status:known_not_affected": "108",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47203.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-06T02:07:36Z",
      "cve": "CVE-2021-47203",
      "id": "CVE-2021-47203",
      "initial_release_date": "2024-04-17T02:29:23Z",
      "product_status:known_affected": "259",
      "product_status:known_not_affected": "174",
      "product_status:recommended": "701",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47203",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47203.json",
      "version": "59"
    },
    "vulnrichment": {
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lpfc_drain_txq drains deferred ELS IOCBs on the Emulex FC HBA ELS ring; an adjacent FC/FCoE SAN fabric peer can induce discovery/ELS congestion that queues and drains those jobs, matching other lpfc adjacent-fabric scores.\\nAC:L - A fabric attacker can flood ELS/discovery to exhaust SGLs (building a multi-job txq) and fill the WQ so one submit fails then later jobs succeed in the same drain; the sticky fail_msg bug then fires without relying on an uncontrollable memory layout.\\nPR:N - The path runs in HBA/worker context on fabric-driven ELS traffic with no host authentication or capabilities required of the SAN peer.\\nUI:N - ELS deferral and txq drain run automatically during fabric discovery and link events; no local user action is required.\\nS:U - List corruption and resulting UAF stay inside the host kernel lpfc heap under the same OS authority; no VM escape or IOMMU/DMA boundary is crossed.\\nC:H - Successfully submitted iocbqs are wrongly list_add\u0027d onto completions while still on txcmplq, yielding list corruption and UAF of iocbq objects (including via iocbq_lookup on HW completion), enabling reclaim-assisted arbitrary read.\\nI:H - Cancel invokes cmd_cmpl on the double-listed iocbq while HW completion still references it, producing a UAF with a callable function pointer suitable for heap grooming and control-flow hijack.\\nA:H - Corrupted list walks and the subsequent UAF cause kernel oops/panic (or hangs under list corruption), fully denying host and FC storage-path availability.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\", \"lessThan\": \"ad4776b5eb2e58af1226847fcd3b4f6d051674dd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\", \"lessThan\": \"ec70d80a8642900086447ba0cdc79e3f44d42e8f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\", \"lessThan\": \"f05a0191b90156e539cccc189b9d87ca2a4d9305\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\", \"lessThan\": \"b291d147d0268e93ad866f8bc820ea14497abc9b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\", \"lessThan\": \"16bcbfb56d759c25665f786e33ec633b9508a08f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\", \"lessThan\": \"c097bd5a59162156d9c2077a2f58732ffbaa9fca\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\", \"lessThan\": \"814d3610c4ce86e8cf285b2cdac0057a42e82de5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984\", \"lessThan\": \"99154581b05c8fb22607afb7c3d66c1bace6aa5d\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/scsi/lpfc/lpfc_sli.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.36\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.36\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.4.293\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.4.*\"}, {\"status\": \"unaffected\", \"version\": \"4.9.291\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.256\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.218\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.162\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.82\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/scsi/lpfc/lpfc_sli.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/ad4776b5eb2e58af1226847fcd3b4f6d051674dd\"}, {\"url\": \"https://git.kernel.org/stable/c/ec70d80a8642900086447ba0cdc79e3f44d42e8f\"}, {\"url\": \"https://git.kernel.org/stable/c/f05a0191b90156e539cccc189b9d87ca2a4d9305\"}, {\"url\": \"https://git.kernel.org/stable/c/b291d147d0268e93ad866f8bc820ea14497abc9b\"}, {\"url\": \"https://git.kernel.org/stable/c/16bcbfb56d759c25665f786e33ec633b9508a08f\"}, {\"url\": \"https://git.kernel.org/stable/c/c097bd5a59162156d9c2077a2f58732ffbaa9fca\"}, {\"url\": \"https://git.kernel.org/stable/c/814d3610c4ce86e8cf285b2cdac0057a42e82de5\"}, {\"url\": \"https://git.kernel.org/stable/c/99154581b05c8fb22607afb7c3d66c1bace6aa5d\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nscsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()\\n\\nWhen parsing the txq list in lpfc_drain_txq(), the driver attempts to pass\\nthe requests to the adapter. If such an attempt fails, a local \\\"fail_msg\\\"\\nstring is set and a log message output.  The job is then added to a\\ncompletions list for cancellation.\\n\\nProcessing of any further jobs from the txq list continues, but since\\n\\\"fail_msg\\\" remains set, jobs are added to the completions list regardless\\nof whether a wqe was passed to the adapter.  If successfully added to\\ntxcmplq, jobs are added to both lists resulting in list corruption.\\n\\nFix by clearing the fail_msg string after adding a job to the completions\\nlist. This stops the subsequent jobs from being added to the completions\\nlist unless they had an appropriate failure.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.293\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.291\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.256\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.218\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.162\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.82\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.5\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"2.6.36\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:46:43.456Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47203\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:46:43.456Z\", \"dateReserved\": \"2024-03-25T09:12:14.117Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-10T18:56:37.066Z\", \"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.