CVE-2021-46973 (GCVE-0-2021-46973)

Vulnerability from cvelistv5 – Published: 2024-02-27 18:47 – Updated: 2026-05-11 13:45
VLAI?
Title
net: qrtr: Avoid potential use after free in MHI send
Summary
In the Linux kernel, the following vulnerability has been resolved: net: qrtr: Avoid potential use after free in MHI send It is possible that the MHI ul_callback will be invoked immediately following the queueing of the skb for transmission, leading to the callback decrementing the refcount of the associated sk and freeing the skb. As such the dereference of skb and the increment of the sk refcount must happen before the skb is queued, to avoid the skb to be used after free and potentially the sk to drop its last refcount..
Severity ?
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6e728f321393b1fce9e1c2c3e55f9f7c15991321 , < 48ec949ac979b4b42d740f67b6177797af834f80 (git)
Affected: 6e728f321393b1fce9e1c2c3e55f9f7c15991321 , < ea474054c2cc6e1284604b21361f475c7cc8c0a0 (git)
Affected: 6e728f321393b1fce9e1c2c3e55f9f7c15991321 , < 03c649dee8b1eb5600212a249542a70f47a5ab40 (git)
Affected: 6e728f321393b1fce9e1c2c3e55f9f7c15991321 , < 47a017f33943278570c072bc71681809b2567b3a (git)
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Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.35 , ≤ 5.10.* (semver)
Unaffected: 5.11.19 , ≤ 5.11.* (semver)
Unaffected: 5.12.2 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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\"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-46973\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-02-28T18:49:05.463431Z\"}}}], \"affected\": [{\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"6e728f321393\", \"lessThan\": \"48ec949ac979\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6e728f321393\", \"lessThan\": \"ea474054c2cc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6e728f321393\", \"versionType\": \"git\", \"lessThanOrEqual\": \"03c649dee8b1\"}, {\"status\": \"affected\", \"version\": \"6e728f321393\", \"lessThan\": \"47a017f33943\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.8\", \"versionType\": \"custom\"}, {\"status\": \"unaffected\", \"version\": \"5.10.35\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.11\"}, {\"status\": \"unaffected\", \"version\": \"5.11.19\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.12\"}, {\"status\": \"unaffected\", \"version\": \"5.12.2\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.13\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"*\"}], \"defaultStatus\": \"unknown\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-07-25T15:47:17.864Z\"}}], \"cna\": {\"title\": \"net: qrtr: Avoid potential use after free in MHI send\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6e728f321393b1fce9e1c2c3e55f9f7c15991321\", \"lessThan\": \"48ec949ac979b4b42d740f67b6177797af834f80\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6e728f321393b1fce9e1c2c3e55f9f7c15991321\", \"lessThan\": \"ea474054c2cc6e1284604b21361f475c7cc8c0a0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6e728f321393b1fce9e1c2c3e55f9f7c15991321\", \"lessThan\": \"03c649dee8b1eb5600212a249542a70f47a5ab40\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6e728f321393b1fce9e1c2c3e55f9f7c15991321\", \"lessThan\": \"47a017f33943278570c072bc71681809b2567b3a\", \"versionType\": \"git\"}], \"programFiles\": 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\"https://git.kernel.org/stable/c/48ec949ac979b4b42d740f67b6177797af834f80\"}, {\"url\": \"https://git.kernel.org/stable/c/ea474054c2cc6e1284604b21361f475c7cc8c0a0\"}, {\"url\": \"https://git.kernel.org/stable/c/03c649dee8b1eb5600212a249542a70f47a5ab40\"}, {\"url\": \"https://git.kernel.org/stable/c/47a017f33943278570c072bc71681809b2567b3a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: qrtr: Avoid potential use after free in MHI send\\n\\nIt is possible that the MHI ul_callback will be invoked immediately\\nfollowing the queueing of the skb for transmission, leading to the\\ncallback decrementing the refcount of the associated sk and freeing the\\nskb.\\n\\nAs such the dereference of skb and the increment of the sk refcount must\\nhappen before the skb is queued, to avoid the skb to be used after free\\nand potentially the sk to drop its last refcount..\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.35\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.19\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.2\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:01:28.129Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-46973\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:01:28.129Z\", \"dateReserved\": \"2024-02-27T18:42:55.944Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-27T18:47:07.880Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.