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 · CISA-ADP (v2.0.3)
Decision recorded 2024-06-26 20:36 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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                "url": "https://git.kernel.org/stable/c/e5cc361e21648b75f935f9571d4003aaee480214"
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            "title": "CVE Program Container"
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                  "content": {
                    "id": "CVE-2021-47148",
                    "options": [
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                      {
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                    "role": "CISA Coordinator",
                    "timestamp": "2024-06-26T20:36:23.128673Z",
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              "shortName": "CISA-ADP"
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            "title": "CISA ADP Vulnrichment"
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              "product": "Linux",
              "programFiles": [
                "drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c"
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              "versions": [
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
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                  "version": "5.12.9",
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                  "status": "unaffected",
                  "version": "5.13",
                  "versionType": "original_commit_for_fix"
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                "baseSeverity": "HIGH",
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                  "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."
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        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47148",
        "datePublished": "2024-03-25T09:07:44.472Z",
        "dateReserved": "2024-03-04T18:12:48.845Z",
        "dateUpdated": "2026-08-05T08:46:19.658Z",
        "state": "PUBLISHED"
      },
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  }
}



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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

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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.