CVE-2021-47548 (GCVE-0-2021-47548)

Vulnerability from cvelistv5 – Published: 2024-05-24 15:09 – Updated: 2026-05-11 13:56
VLAI
Title
ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port()
Summary
In the Linux kernel, the following vulnerability has been resolved: ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() The if statement: if (port >= DSAF_GE_NUM) return; limits the value of port less than DSAF_GE_NUM (i.e., 8). However, if the value of port is 6 or 7, an array overflow could occur: port_rst_off = dsaf_dev->mac_cb[port]->port_rst_off; because the length of dsaf_dev->mac_cb is DSAF_MAX_PORT_NUM (i.e., 6). To fix this possible array overflow, we first check port and if it is greater than or equal to DSAF_MAX_PORT_NUM, the function returns.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-129 - Improper Validation of Array Index
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca , < 948968f8747650447c8f21c9fdba0e1973be040b (git)
Affected: 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca , < abbd5faa0748d0aa95d5191d56ff7a17a6275bd1 (git)
Affected: 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca , < dd07f8971b81ad98cc754b179b331b57f35aa1ff (git)
Affected: 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca , < 99bb25cb6753beaf2c2bc37927c2ecc0ceff3f6d (git)
Affected: 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca , < 22519eff7df2d88adcc2568d86046ce1e2b52803 (git)
Affected: 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca , < fc7ffa7f10b9454a86369405d9814bf141b30627 (git)
Affected: 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca , < a66998e0fbf213d47d02813b9679426129d0d114 (git)
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Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 4.9.292 , ≤ 4.9.* (semver)
Unaffected: 4.14.257 , ≤ 4.14.* (semver)
Unaffected: 4.19.220 , ≤ 4.19.* (semver)
Unaffected: 5.4.164 , ≤ 5.4.* (semver)
Unaffected: 5.10.84 , ≤ 5.10.* (semver)
Unaffected: 5.15.7 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
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linux linux_kernel Affected: 1da177e4c3f4 , < 948968f87476 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 1da177e4c3f4 , < abbd5faa0748 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 1da177e4c3f4 , < dd07f8971b81 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 1da177e4c3f4 , < 99bb25cb6753 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 1da177e4c3f4 , < 22519eff7df2 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 1da177e4c3f4 , < fc7ffa7f10b9 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 1da177e4c3f4 , < a66998e0fbf2 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 4.9.292 , ≤ 4.9.* (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 4.14.257 , ≤ 4.14* (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 4.19.220 , ≤ 4.19.* (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 5.4.164 , ≤ 5.4.* (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 5.10.84 , ≤ 5.10.* (custom)
    cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 5.15.7 , ≤ 5.15.* (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 5.16
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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      "date": "2026-06-05",
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{\"status\": \"affected\", \"version\": \"850bfa3b78ea8849fef78ed74f5f2ccf947db0ca\", \"lessThan\": \"99bb25cb6753beaf2c2bc37927c2ecc0ceff3f6d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"850bfa3b78ea8849fef78ed74f5f2ccf947db0ca\", \"lessThan\": \"22519eff7df2d88adcc2568d86046ce1e2b52803\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"850bfa3b78ea8849fef78ed74f5f2ccf947db0ca\", \"lessThan\": \"fc7ffa7f10b9454a86369405d9814bf141b30627\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"850bfa3b78ea8849fef78ed74f5f2ccf947db0ca\", \"lessThan\": \"a66998e0fbf213d47d02813b9679426129d0d114\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.9.292\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.257\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.220\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.164\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.84\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/948968f8747650447c8f21c9fdba0e1973be040b\"}, {\"url\": \"https://git.kernel.org/stable/c/abbd5faa0748d0aa95d5191d56ff7a17a6275bd1\"}, {\"url\": \"https://git.kernel.org/stable/c/dd07f8971b81ad98cc754b179b331b57f35aa1ff\"}, {\"url\": \"https://git.kernel.org/stable/c/99bb25cb6753beaf2c2bc37927c2ecc0ceff3f6d\"}, {\"url\": \"https://git.kernel.org/stable/c/22519eff7df2d88adcc2568d86046ce1e2b52803\"}, {\"url\": \"https://git.kernel.org/stable/c/fc7ffa7f10b9454a86369405d9814bf141b30627\"}, {\"url\": \"https://git.kernel.org/stable/c/a66998e0fbf213d47d02813b9679426129d0d114\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port()\\n\\nThe if statement:\\n  if (port \u003e= DSAF_GE_NUM)\\n        return;\\n\\nlimits the value of port less than DSAF_GE_NUM (i.e., 8).\\nHowever, if the value of port is 6 or 7, an array overflow could occur:\\n  port_rst_off = dsaf_dev-\u003emac_cb[port]-\u003eport_rst_off;\\n\\nbecause the length of dsaf_dev-\u003emac_cb is DSAF_MAX_PORT_NUM (i.e., 6).\\n\\nTo fix this possible array overflow, we first check port and if it is\\ngreater than or equal to DSAF_MAX_PORT_NUM, the function returns.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.292\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.257\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.220\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.164\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.84\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.7\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"4.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-09T21:43:49.384Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47548\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-09T21:43:49.384Z\", \"dateReserved\": \"2024-05-24T15:02:54.829Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-24T15:09:52.634Z\", \"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.