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CVE-2021-47378 (GCVE-0-2021-47378)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2026-08-05 08:47
VLAI
Title
nvme-rdma: destroy cm id before destroy qp to avoid use after free
Summary
In the Linux kernel, the following vulnerability has been resolved: nvme-rdma: destroy cm id before destroy qp to avoid use after free We should always destroy cm_id before destroy qp to avoid to get cma event after qp was destroyed, which may lead to use after free. In RDMA connection establishment error flow, don't destroy qp in cm event handler.Just report cm_error to upper level, qp will be destroy in nvme_rdma_alloc_queue() after destroy cm id.
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 · CISA-ADP (v2.0.3)
Decision recorded 2025-01-16 21:04 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7110230719602852481c2793d054f866b2bf4a2b , < ecf0dc5a904830c926a64feffd8e01141f89822f (git)
Affected: 7110230719602852481c2793d054f866b2bf4a2b , < d268a182c56e8361e19fb781137411643312b994 (git)
Affected: 7110230719602852481c2793d054f866b2bf4a2b , < 9817d763dbe15327b9b3ff4404fa6f27f927e744 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.10.70 , ≤ 5.10.* (semver)
Unaffected: 5.14.9 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
linux linux_kernel Affected: 1da177e4c3f4
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Unaffected: 5.10.70
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Unaffected: 5.14.9
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Unaffected: 5.15
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
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      "product_status:known_affected": "50",
      "product_status:known_not_affected": "85",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nvme-rdma: destroy cm id before destroy qp to avoid use after free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47378.json",
      "version": "3"
    },
    "vulnrichment": {
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            "providerMetadata": {
              "dateUpdated": "2024-08-04T05:32:08.590Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
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            "references": [
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                "url": "https://git.kernel.org/stable/c/ecf0dc5a904830c926a64feffd8e01141f89822f"
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                "url": "https://git.kernel.org/stable/c/d268a182c56e8361e19fb781137411643312b994"
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                "url": "https://git.kernel.org/stable/c/9817d763dbe15327b9b3ff4404fa6f27f927e744"
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            ],
            "title": "CVE Program Container"
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                  "attackVector": "NETWORK",
                  "availabilityImpact": "HIGH",
                  "baseScore": 9.8,
                  "baseSeverity": "CRITICAL",
                  "confidentialityImpact": "HIGH",
                  "integrityImpact": "HIGH",
                  "privilegesRequired": "NONE",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              {
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                  "content": {
                    "id": "CVE-2021-47378",
                    "options": [
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                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
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                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-01-16T21:04:16.754681Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
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              }
            ],
            "problemTypes": [
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                    "description": "CWE-416 Use After Free",
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            "providerMetadata": {
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            },
            "title": "CISA ADP Vulnrichment"
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "versions": [
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                  "version": "0",
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                  "value": "AV:N - The nvme-rdma initiator processes RDMA CM events (REJECTED/CONNECT_ERROR/UNREACHABLE/DISCONNECTED) from a remote NVMe-oF peer over InfiniBand/RoCE/iWARP; a malicious or compromised target drives the buggy destroy-QP-before-cm_id paths via fabric protocol messages on connect/reconnect/teardown.\nAC:L - The remote peer fully controls CM handshake failures and disconnects that enter nvme_rdma_cm_handler and later free_queue, so it can reliably cause QP destruction while cm_id remains live and deliver further CMA events into the UAF window.\nPR:N - Once an NVMe-RDMA controller session exists (typical datacenter autoconnect), the attacker needs no account or capabilities on the victim host and triggers the bug solely as the unauthenticated fabric peer.\nUI:N - No extra victim action is required at exploit time beyond a pre-existing or auto-reconnecting NVMe-RDMA attachment; CM error and disconnect handling runs in kernel context from peer events.\nS:U - The use-after-free corrupts host-kernel RDMA/NVMe structures under the same OS security authority and does not cross a VM, IOMMU, or other distinct boundary.\nC:H - Destroying the QP/ring while cm_id can still deliver CMA callbacks is a kernel heap use-after-free; per UAF guidance this enables heap reuse and arbitrary kernel read primitives.\nI:H - The same freed QP-related objects are sprayable for arbitrary write and control-flow hijacking in kernel context once reclaimed.\nA:H - Use-after-free of the queue IB resources can oops/panic the kernel during CM handling or teardown even without a full exploit, fully denying availability."
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        "datePublished": "2024-05-21T15:03:41.038Z",
        "dateReserved": "2024-05-21T14:58:30.811Z",
        "dateUpdated": "2026-08-05T08:47:31.303Z",
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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.


Detection rules are retrieved from Rulezet.


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.