CVE-2021-47081 (GCVE-0-2021-47081)

Vulnerability from cvelistv5 – Published: 2024-03-01 21:15 – Updated: 2026-08-05 08:45
VLAI
Title
habanalabs/gaudi: Fix a potential use after free in gaudi_memset_device_memory
Summary
In the Linux kernel, the following vulnerability has been resolved: habanalabs/gaudi: Fix a potential use after free in gaudi_memset_device_memory Our code analyzer reported a uaf. In gaudi_memset_device_memory, cb is get via hl_cb_kernel_create() with 2 refcount. If hl_cs_allocate_job() failed, the execution runs into release_cb branch. One ref of cb is dropped by hl_cb_put(cb) and could be freed if other thread also drops one ref. Then cb is used by cb->id later, which is a potential uaf. My patch add a variable 'id' to accept the value of cb->id before the hl_cb_put(cb) is called, to avoid the potential uaf.
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 2024-03-04 19:32 UTC
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 423815bf02e257091d5337be5c63b57fc29e4254 , < b49f5af30b0e4064fbd91e83823a4bfcb2c7a3e7 (git)
Affected: 423815bf02e257091d5337be5c63b57fc29e4254 , < 115726c5d312b462c9d9931ea42becdfa838a076 (git)
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Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.12.7 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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              "cvssV3_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",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerable path is reached by opening and closing the local HabanaLabs char device (/dev/hl*), which triggers context release, memory scrubbing, and gaudi_memset_device_memory; it is not reachable via network packets.\nAC:L - An attacker who can open the device reliably drives the put-then-use-id cleanup on every scrub/memset invocation, and use-after-free races of this kind are treated as attacker-influencible rather than requiring uncontrollable conditions.\nPR:L - hl_device_open performs no capability check, and Gaudi device nodes are routinely granted to unprivileged users via udev group/world permissions in real deployments, matching other scored habanalabs CVEs.\nUI:N - The attacker triggers the bug solely by opening and closing the device themselves; no separate victim action is required.\nS:U - Impact is confined to the host kernel authority (local privilege escalation / memory corruption); there is no VM, IOMMU, or other security-authority boundary crossed.\nC:H - This is a use-after-free on a kernel command-buffer object; UAF enables heap reuse and disclosure of freed object contents, so confidentiality impact is High.\nI:H - Use-after-free of the CB object can be turned into heap spray and arbitrary write / control-flow hijacking primitives, so integrity impact is High.\nA:H - Use-after-free of kernel memory can cause kernel oops/panic or device-driver failure, yielding High availability impact."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:45:52.781Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/b49f5af30b0e4064fbd91e83823a4bfcb2c7a3e7"
            },
            {
              "url": "https://git.kernel.org/stable/c/115726c5d312b462c9d9931ea42becdfa838a076"
            }
          ],
          "title": "habanalabs/gaudi: Fix a potential use after free in gaudi_memset_device_memory",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47081",
        "datePublished": "2024-03-01T21:15:16.684Z",
        "dateReserved": "2024-02-29T22:33:44.298Z",
        "dateUpdated": "2026-08-05T08:45:52.781Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.