CVE-2026-92488 (GCVE-0-2026-92488)
Vulnerability from cvelistv5
Published
2026-09-17 16:10
Modified
2026-10-21 12:51
Severity ?
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/erdma: complete object teardown when the destroy command fails erdma_destroy_qp(), erdma_destroy_cq(), erdma_dereg_mr(), and erdma_destroy_ah() returned early when erdma_post_cmd_wait() failed, leaking the queue buffers, MTTs, doorbells and the STAG, QPN, CQN and AHN identifiers. A command timeout clears ERDMA_CMDQ_STATE_OK_BIT and permanently disables the command queue, so no retry can succeed; the RDMA core keeps the object after a failed destructor and forced uverbs cleanup then nulls the pointers, making the resources unreachable. Warn on failure but release every software-owned resource and return success, since during terminal destruction the hardware command result is only diagnostic.
References
Impacted products
Vendor Product Version
Linux Linux Version: 155055771704f8cbb5c176a4309b7dc30a50450c
Version: 155055771704f8cbb5c176a4309b7dc30a50450c
Version: 155055771704f8cbb5c176a4309b7dc30a50450c
Version: 155055771704f8cbb5c176a4309b7dc30a50450c
Version: 155055771704f8cbb5c176a4309b7dc30a50450c
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/erdma/erdma_verbs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3886d944b506e0cc681646beb03c3024cb375a68",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "5fcfc988ecf3e2bbe308b95c2c0d2f011d9afabe",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "ce7d205c264665517c25e8a3231cf2d0c2443e3c",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "334145d683ad3e31d052247f10807f2ebc950351",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "652befcba956ef357f480525ccbe25c59bc81d4d",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/erdma/erdma_verbs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/erdma: complete object teardown when the destroy command fails\n\nerdma_destroy_qp(), erdma_destroy_cq(), erdma_dereg_mr(), and\nerdma_destroy_ah() returned early when erdma_post_cmd_wait() failed,\nleaking the queue buffers, MTTs, doorbells and the STAG, QPN, CQN and AHN\nidentifiers. A command timeout clears ERDMA_CMDQ_STATE_OK_BIT and\npermanently disables the command queue, so no retry can succeed; the RDMA\ncore keeps the object after a failed destructor and forced uverbs cleanup\nthen nulls the pointers, making the resources unreachable.\n\nWarn on failure but release every software-owned resource and return\nsuccess, since during terminal destruction the hardware command result is\nonly diagnostic."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/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 from ib_uverbs_write(IB_USER_VERBS_CMD_DESTROY_QP/DESTROY_CQ/DEREG_MR/DESTROY_AH) or ib_uverbs_ioctl(UVERBS_METHOD_*_DESTROY) on /dev/infiniband/uverbs*, which call uobj_destroy -\u003e ib_destroy_qp_user/ib_destroy_cq_user/ib_dereg_mr_user -\u003e erdma_destroy_*; a remote RoCE/iWARP peer never supplies that destroy command.\nAC:H - erdma_destroy_qp/cq/ah and erdma_dereg_mr only skip teardown when erdma_post_cmd_wait() fails. That wait returns -ETIME after ERDMA_CMDQ_TIMEOUT_MS and then clears ERDMA_CMDQ_STATE_OK_BIT, or -EIO on a hardware syndrome; the SQE is built by the driver from the kernel-owned QPN/CQN/lkey/AHN, so the attacker cannot force that failure.\nPR:L - ib_uverbs_open() only checks rdma_dev_access_netns() and uverbs_devnode() sets mode 0666. erdma_alloc_ucontext() requires CAP_SYS_RAWIO only when ERDMA_DEV_CAP_FLAGS_EXTEND_DB is unset; on extend-doorbell hardware an unprivileged local user can GET_CONTEXT, CREATE_QP/CQ and then hit the failing destructors.\nUI:N - The attacker issues DESTROY_* on their own uverbs fd or closes it so ib_uverbs_close() runs uverbs_destroy_ufile_hw(); no other user must mount a filesystem, open a file, or otherwise cooperate.\nS:U - A leftover erdma_cq/erdma_qp in cq_xa/qp_xa and a UAF of the associated ib_ucq_object stay inside the host kernel; this is not a KVM/Xen guest-to-host escape or an IOMMU/DMA boundary bypass.\nC:H - On command failure erdma_destroy_cq() returns before xa_erase(\u0026dev-\u003ecq_xa). __uverbs_cleanup_ufile(RDMA_REMOVE_DRIVER_FAILURE) then nulls uobj-\u003eobject without ib_destroy_cq_user and frees the ib_ucq_object, so erdma_ceq_completion_handler() -\u003e ib_uverbs_comp_handler() reads the freed cq-\u003euobject.\nI:H - The same ib_uverbs_comp_handler() then list_add_tail()s onto the freed ev_queue-\u003eevent_list and ib_ucq_object.comp_list after DRIVER_FAILURE dropped the uobject, a use-after-free write into slab memory that can corrupt a reused object or freelist metadata.\nA:H - The CEQ tasklet UAF in ib_uverbs_comp_handler() can oops; independently, returning before erdma_free_idx()/put_mtt_entries()/dma_free_coherent() leaks STAG/QPN/CQN/AHN IDs and DMA queue buffers, and a cmdq timeout permanently disables further commands."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:51:43.507Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3886d944b506e0cc681646beb03c3024cb375a68"
        },
        {
          "url": "https://git.kernel.org/stable/c/5fcfc988ecf3e2bbe308b95c2c0d2f011d9afabe"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce7d205c264665517c25e8a3231cf2d0c2443e3c"
        },
        {
          "url": "https://git.kernel.org/stable/c/334145d683ad3e31d052247f10807f2ebc950351"
        },
        {
          "url": "https://git.kernel.org/stable/c/652befcba956ef357f480525ccbe25c59bc81d4d"
        }
      ],
      "title": "RDMA/erdma: complete object teardown when the destroy command fails",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-92488",
    "datePublished": "2026-09-17T16:10:02.962Z",
    "dateReserved": "2026-09-16T12:21:13.870Z",
    "dateUpdated": "2026-10-21T12:51:43.507Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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