CVE-2021-47148 (GCVE-0-2021-47148)

Vulnerability from cvelistv5 – Published: 2024-03-25 09:07 – Updated: 2026-08-05 08:46
VLAI
Title
octeontx2-pf: fix a buffer overflow in otx2_set_rxfh_context()
Summary
In the Linux kernel, the following vulnerability has been resolved: octeontx2-pf: fix a buffer overflow in otx2_set_rxfh_context() This function is called from ethtool_set_rxfh() and "*rss_context" comes from the user. Add some bounds checking to prevent memory corruption.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/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: 81a4362016e7d8b17031fe1aa43cdb58a7f0f163 , < 389146bc6d2bbb20714d06624b74856320ce40f7 (git)
Affected: 81a4362016e7d8b17031fe1aa43cdb58a7f0f163 , < e5cc361e21648b75f935f9571d4003aaee480214 (git)
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Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.12.9 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/389146bc6d2bbb20714d06624b74856320ce40f7\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/e5cc361e21648b75f935f9571d4003aaee480214\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:24:40.199Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47148\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-26T20:36:23.128673Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-26T20:36:26.803Z\"}}], \"cna\": {\"title\": \"octeontx2-pf: fix a buffer overflow in otx2_set_rxfh_context()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerable path is reached only through a local SIOCETHTOOL ioctl (ETHTOOL_SRSSH \\u2192 ethtool_set_rxfh \\u2192 otx2_set_rxfh_context); it is not triggered by received network packets or a remote service.\\nAC:L - The attacker fully controls the rss_context u32 from userspace and can reliably pass an out-of-bounds value; no race or external conditions beyond the attacker\u0027s control are required to hit the overflow.\\nPR:L - ETHTOOL_SRSSH requires CAP_NET_ADMIN via ns_capable(net-\u003euser_ns, CAP_NET_ADMIN), which is obtainable without real init-namespace root when an octeontx2 PF/VF is present in a userns-owned netns (common SR-IOV/container deployments), so privileges are Low under kernel CNA guidance.\\nUI:N - No victim action is required; the attacker issues the ethtool ioctl directly once they have local access and the needed capability.\\nS:U - The corruption occurs in the host/guest kernel driver and elevates impact only within that same kernel security authority; it is not a VM escape or IOMMU/DMA boundary bypass.\\nC:H - A user-controlled index into rss_ctx[] performs an out-of-bounds pointer load and can be paired with write/free primitives, which per guidance for memory corruption is treated as enabling high confidentiality impact.\\nI:H - With an OOB context the code writes attacker-influenced indir bytes through the fetched pointer and can kfree an OOB pointer on delete, giving classic out-of-bounds write / arbitrary-free integrity compromise.\\nA:H - Invalid pointer dereference or free from the out-of-bounds rss_ctx access can oops/panic the kernel, so availability impact is High.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"81a4362016e7d8b17031fe1aa43cdb58a7f0f163\", \"lessThan\": \"389146bc6d2bbb20714d06624b74856320ce40f7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"81a4362016e7d8b17031fe1aa43cdb58a7f0f163\", \"lessThan\": \"e5cc361e21648b75f935f9571d4003aaee480214\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.12.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/389146bc6d2bbb20714d06624b74856320ce40f7\"}, {\"url\": \"https://git.kernel.org/stable/c/e5cc361e21648b75f935f9571d4003aaee480214\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nocteontx2-pf: fix a buffer overflow in otx2_set_rxfh_context()\\n\\nThis function is called from ethtool_set_rxfh() and \\\"*rss_context\\\"\\ncomes from the user.  Add some bounds checking to prevent memory\\ncorruption.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.9\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:46:19.658Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47148\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:46:19.658Z\", \"dateReserved\": \"2024-03-04T18:12:48.845Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-25T09:07:44.472Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
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.