CVE-2021-47013 (GCVE-0-2021-47013)

Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2026-05-11 13:46
VLAI
Title
net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send
Summary
In the Linux kernel, the following vulnerability has been resolved: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tpd(), the skb will be freed via dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len). As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b9b17debc69d27cd55e21ee51a5ba7fc50a426cf , < c7f75d11fe72913d2619f97b2334b083cd7bb955 (git)
Affected: b9b17debc69d27cd55e21ee51a5ba7fc50a426cf , < dc1b438a35773d030be0ee80d9c635c3e558a322 (git)
Affected: b9b17debc69d27cd55e21ee51a5ba7fc50a426cf , < 16d8c44be52e3650917736d45f5904384a9da834 (git)
Affected: b9b17debc69d27cd55e21ee51a5ba7fc50a426cf , < 55fcdd1258faaecca74b91b88cc0921f9edd775d (git)
Affected: b9b17debc69d27cd55e21ee51a5ba7fc50a426cf , < 9dc373f74097edd0e35f3393d6248eda8d1ba99d (git)
Affected: b9b17debc69d27cd55e21ee51a5ba7fc50a426cf , < 8c06f34785068b87e2b560534c77c163d6c6dca7 (git)
Affected: b9b17debc69d27cd55e21ee51a5ba7fc50a426cf , < e407495ba6788a67d1bd41714158c079e340879b (git)
Affected: b9b17debc69d27cd55e21ee51a5ba7fc50a426cf , < 6d72e7c767acbbdd44ebc7d89c6690b405b32b57 (git)
Create a notification for this product.
Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 4.9.269 , ≤ 4.9.* (semver)
Unaffected: 4.14.233 , ≤ 4.14.* (semver)
Unaffected: 4.19.191 , ≤ 4.19.* (semver)
Unaffected: 5.4.119 , ≤ 5.4.* (semver)
Unaffected: 5.10.37 , ≤ 5.10.* (semver)
Unaffected: 5.11.21 , ≤ 5.11.* (semver)
Unaffected: 5.12.4 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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      "vulnStatus": "Analyzed",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
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Si ocurre alg\u00fan error en emac_tx_fill_tpd(), el skb se liberar\u00e1 mediante dev_kfree_skb(skb) en la rama de error de emac_tx_fill_tpd(). Pero el skb liberado todav\u00eda se usa a trav\u00e9s de skb-\u0026gt;len por netdev_sent_queue(,skb-\u0026gt;len). Como observ\u00e9 que emac_tx_fill_tpd() no ha modificado el valor de skb-\u0026gt;len, por lo tanto mi parche asigna skb-\u0026gt;len a \u0027len\u0027 antes del posible free y usa \u0027len\u0027 en lugar de skb-\u0026gt;len m\u00e1s 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:49:40+00:00",
      "cve": "CVE-2021-47013",
      "id": "CVE-2021-47013",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:fixed": "399",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "108",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47013.json",
      "version": "3"
    },
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\"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.191\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.119\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.37\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/ethernet/qualcomm/emac/emac-mac.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955\"}, {\"url\": \"https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322\"}, {\"url\": \"https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834\"}, {\"url\": \"https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d\"}, {\"url\": \"https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d\"}, {\"url\": \"https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7\"}, {\"url\": \"https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b\"}, {\"url\": \"https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send\\n\\nIn emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..).\\nIf some error happens in emac_tx_fill_tpd(), the skb will be freed via\\ndev_kfree_skb(skb) in error branch of emac_tx_fill_tpd().\\nBut the freed skb is still used via skb-\u003elen by netdev_sent_queue(,skb-\u003elen).\\n\\nAs i observed that emac_tx_fill_tpd() haven\u0027t modified the value of skb-\u003elen,\\nthus my patch assigns skb-\u003elen to \u0027len\u0027 before the possible free and\\nuse \u0027len\u0027 instead of skb-\u003elen later.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.269\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.233\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.191\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.119\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.37\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.21\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.4\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"4.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:02:18.890Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47013\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:02:18.890Z\", \"dateReserved\": \"2024-02-27T18:42:55.953Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-28T08:13:30.905Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.