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CVE-2022-49076 (GCVE-0-2022-49076)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2026-08-05 08:53
VLAI
Title
RDMA/hfi1: Fix use-after-free bug for mm struct
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/hfi1: Fix use-after-free bug for mm struct Under certain conditions, such as MPI_Abort, the hfi1 cleanup code may represent the last reference held on the task mm. hfi1_mmu_rb_unregister() then drops the last reference and the mm is freed before the final use in hfi1_release_user_pages(). A new task may allocate the mm structure while it is still being used, resulting in problems. One manifestation is corruption of the mmap_sem counter leading to a hang in down_write(). Another is corruption of an mm struct that is in use by another task.
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: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-27 18:17 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3d2a9d642512c21a12d19b9250e7a835dcb41a79 , < 5f54364ff6cfcd14cddf5441c4a490bb28dd69f7 (git)
Affected: 3d2a9d642512c21a12d19b9250e7a835dcb41a79 , < 9ca11bd8222a612de0d2f54d050bfcf61ae2883f (git)
Affected: 3d2a9d642512c21a12d19b9250e7a835dcb41a79 , < 0b7186d657ee55e2cdefae498f07d5c1961e8023 (git)
Affected: 3d2a9d642512c21a12d19b9250e7a835dcb41a79 , < 5a9a1b24ddb510715f8f621263938186579a965c (git)
Affected: 3d2a9d642512c21a12d19b9250e7a835dcb41a79 , < 2bbac98d0930e8161b1957dc0ec99de39ade1b3c (git)
Affected: 5732f83596f8a573f2cde814cc76a54e1a8995c7 (git)
Affected: 5.9.12 , < 5.10 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.111 , ≤ 5.10.* (semver)
Unaffected: 5.15.34 , ≤ 5.15.* (semver)
Unaffected: 5.16.20 , ≤ 5.16.* (semver)
Unaffected: 5.17.3 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "url": "https://git.kernel.org/stable/c/9ca11bd8222a612de0d2f54d050bfcf61ae2883f"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T20:55:53+00:00",
      "cve": "CVE-2022-49076",
      "id": "CVE-2022-49076",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/hfi1: Fix use-after-free bug for mm struct",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49076.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T02:30:33Z",
      "cve": "CVE-2022-49076",
      "id": "CVE-2022-49076",
      "initial_release_date": "2025-02-27T03:12:39Z",
      "product_status:known_affected": "469",
      "product_status:known_not_affected": "182",
      "product_status:recommended": "333",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49076",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49076.json",
      "version": "57"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
                  "baseScore": 7.8,
                  "baseSeverity": "HIGH",
                  "confidentialityImpact": "HIGH",
                  "integrityImpact": "HIGH",
                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2022-49076",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-02-27T18:17:39.018953Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-416",
                    "description": "CWE-416 Use After Free",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-02-27T18:17:40.817Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/infiniband/hw/hfi1/mmu_rb.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "status": "affected",
                  "version": "3d2a9d642512c21a12d19b9250e7a835dcb41a79",
                  "versionType": "git"
                },
                {
                  "lessThan": "9ca11bd8222a612de0d2f54d050bfcf61ae2883f",
                  "status": "affected",
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                  "versionType": "git"
                },
                {
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                  "status": "affected",
                  "version": "3d2a9d642512c21a12d19b9250e7a835dcb41a79",
                  "versionType": "git"
                },
                {
                  "lessThan": "5a9a1b24ddb510715f8f621263938186579a965c",
                  "status": "affected",
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                  "versionType": "git"
                },
                {
                  "lessThan": "2bbac98d0930e8161b1957dc0ec99de39ade1b3c",
                  "status": "affected",
                  "version": "3d2a9d642512c21a12d19b9250e7a835dcb41a79",
                  "versionType": "git"
                },
                {
                  "status": "affected",
                  "version": "5732f83596f8a573f2cde814cc76a54e1a8995c7",
                  "versionType": "git"
                },
                {
                  "lessThan": "5.10",
                  "status": "affected",
                  "version": "5.9.12",
                  "versionType": "semver"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/infiniband/hw/hfi1/mmu_rb.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.10"
                },
                {
                  "lessThan": "5.10",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.111",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.34",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.16.*",
                  "status": "unaffected",
                  "version": "5.16.20",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.17.*",
                  "status": "unaffected",
                  "version": "5.17.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.18",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.111",
                      "versionStartIncluding": "5.10",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.34",
                      "versionStartIncluding": "5.10",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                      "vulnerable": true
                    },
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                      "vulnerable": true
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                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/hfi1: Fix use-after-free bug for mm struct\n\nUnder certain conditions, such as MPI_Abort, the hfi1 cleanup code may\nrepresent the last reference held on the task mm.\nhfi1_mmu_rb_unregister() then drops the last reference and the mm is freed\nbefore the final use in hfi1_release_user_pages().  A new task may\nallocate the mm structure while it is still being used, resulting in\nproblems. One manifestation is corruption of the mmap_sem counter leading\nto a hang in down_write().  Another is corruption of an mm struct that is\nin use by another task."
            }
          ],
          "metrics": [
            {
              "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 bug is reached only through the hfi1 userspace character device path (/dev/hfi1_*, open/ioctl/write/close), specifically hfi1_file_close \u2192 hfi1_user_sdma_free_queues \u2192 hfi1_mmu_rb_unregister; it is not triggered by remote RDMA packet processing.\nAC:L - An attacker who opens the device, assigns a context (registering the mmu notifier and pinning SDMA pages), then exits reliably makes hfi1 cleanup the last mm holder because do_exit() calls exit_mm() before exit_files(); no conditions beyond attacker control are required.\nPR:L - The hfi1 user device is created with mode 0666 and assign_ctxt/open perform no capability checks, so any unprivileged local user with access to Omni-Path hardware can open it and trigger the path.\nUI:N - Exploitation requires only the attacker\u0027s own process actions (open, ioctl, write, exit); no victim user interaction is needed.\nS:U - Impact is confined to the host kernel privilege boundary (mm_struct corruption / local privilege escalation); there is no VM escape or IOMMU/DMA boundary crossing.\nC:H - This is a use-after-free of mm_struct: after mmu_notifier_unregister frees mm, do_remove still uses it via hfi1_release_user_pages; slab reuse of that mm enables corruption of another task\u0027s address-space metadata and arbitrary read primitives.\nI:H - UAF writes (e.g. atomic64_sub on mm-\u003epinned_vm) against a reallocated mm_struct corrupt another task\u0027s mm (including mmap_lock and related state), enabling heap-spray-based arbitrary write / control-flow hijacking.\nA:H - The UAF reliably causes kernel hangs (mmap_sem/mmap_lock corruption leading to stuck down_write) and can oops/panic when the freed mm is reused or accessed improperly."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:53:45.482Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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            {
              "url": "https://git.kernel.org/stable/c/5a9a1b24ddb510715f8f621263938186579a965c"
            },
            {
              "url": "https://git.kernel.org/stable/c/2bbac98d0930e8161b1957dc0ec99de39ade1b3c"
            }
          ],
          "title": "RDMA/hfi1: Fix use-after-free bug for mm struct",
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      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-49076",
        "datePublished": "2025-02-26T01:54:39.251Z",
        "dateReserved": "2025-02-26T01:49:39.246Z",
        "dateUpdated": "2026-08-05T08:53:45.482Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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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

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.


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.