CVE-2026-90423 (GCVE-0-2026-90423)
Vulnerability from cvelistv5
Published
2026-09-17 16:09
Modified
2026-10-19 09:03
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix UAF in ODP init error-handling path rxe_odp_mr_init_user() stores &umem_odp->umem in mr->umem before calling rxe_odp_init_pages(). If rxe_odp_init_pages() fails, rxe_odp_mr_init_user() releases umem_odp and returns an error. rxe_reg_user_mr() then unwinds the error through rxe_cleanup(), rxe_mr_cleanup(), ib_umem_release(mr->umem). There is an IS_ERR_OR_NULL(umem) check at the start of ib_umem_release(). But since mr->umem is NOT reset to NULL in the error handling path of rxe_odp_mr_init_user(), the check passes and it reads already-freed fields like umem->is_dmabuf, causing UAF. Fix the UAF by clearing mr->umem after releasing the failed ODP umem so the MR cleanup path does not release it again.
References
Impacted products
Vendor Product Version
Linux Linux Version: d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91
Version: d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91
Version: d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_odp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5f1933163327c9f1c8f2a341c6cb551aaf231ff9",
              "status": "affected",
              "version": "d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91",
              "versionType": "git"
            },
            {
              "lessThan": "4cfb448705da3171d44d9cbe7be53ff03284d532",
              "status": "affected",
              "version": "d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91",
              "versionType": "git"
            },
            {
              "lessThan": "51f2c8d2c99fc1f452f7113c08a35edcc4bf8732",
              "status": "affected",
              "version": "d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_odp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "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": "6.18.52",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix UAF in ODP init error-handling path\n\nrxe_odp_mr_init_user() stores \u0026umem_odp-\u003eumem in mr-\u003eumem before\ncalling rxe_odp_init_pages(). If rxe_odp_init_pages() fails,\nrxe_odp_mr_init_user() releases umem_odp and returns an error.\n\nrxe_reg_user_mr() then unwinds the error through rxe_cleanup(),\nrxe_mr_cleanup(), ib_umem_release(mr-\u003eumem). There is an\nIS_ERR_OR_NULL(umem) check at the start of ib_umem_release().\nBut since mr-\u003eumem is NOT reset to NULL in the error handling\npath of rxe_odp_mr_init_user(), the check passes and it reads\nalready-freed fields like umem-\u003eis_dmabuf, causing UAF.\n\nFix the UAF by clearing mr-\u003eumem after releasing the failed\nODP umem so the MR cleanup path does not release it again."
        }
      ],
      "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 attacker-controlled bytes are cmd.access_flags (IB_ACCESS_ON_DEMAND), cmd.start and cmd.length from IB_USER_VERBS_CMD_REG_MR written to /dev/infiniband/uverbsN; ib_uverbs_write\u2192ib_uverbs_reg_mr\u2192rxe_reg_user_mr\u2192rxe_odp_mr_init_user. Soft-RoCE packet receive never supplies that REG_MR command.\nAC:L - rxe_odp_init_pages() fails when ib_umem_odp_map_dma_and_lock() returns an error from hmm_range_fault(); a second thread in the same process can munmap the REG_MR VA so rxe_ib_invalidate_range() keeps invalidating the mmu_interval until HMM_RANGE_DEFAULT_TIMEOUT (1000ms) expires with -EBUSY. The UAF on that error path is then deterministic.\nPR:L - uverbs_devnode() publishes /dev/infiniband/uverbs* as 0666; ib_uverbs_open, ib_uverbs_get_context, ib_uverbs_alloc_pd and ib_uverbs_reg_mr have no capability checks, and rxe_init_device_param sets IBK_ON_DEMAND_PAGING so ib_check_mr_access() accepts IB_ACCESS_ON_DEMAND.\nUI:N - The attacker opens uverbs, allocates a PD, and issues REG_MR with IB_ACCESS_ON_DEMAND against a VA range they own; no other user must mount, open, or confirm anything.\nS:U - rxe_mr_cleanup() calls ib_umem_release() on the dangling mr-\u003eumem inside the same host kernel; this does not cross a KVM, Xen, or IOMMU boundary.\nC:H - After ib_umem_odp_release() kfree\u0027s umem_odp, ib_umem_release(mr-\u003eumem) reads the freed umem-\u003eis_dmabuf and umem-\u003eis_odp; slab reuse lets the attacker control those flags and later pointers such as ibdev and owning_mm.\nI:H - The dangling mr-\u003eumem still has is_odp set, so ib_umem_release() calls ib_umem_odp_release() again and kfree\u0027s the already-freed umem_odp, a heap double-free write primitive.\nA:H - The UAF load of umem-\u003eis_dmabuf in ib_umem_release() and the second free of umem_odp oops or KASAN-crash the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:03:27.119Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5f1933163327c9f1c8f2a341c6cb551aaf231ff9"
        },
        {
          "url": "https://git.kernel.org/stable/c/4cfb448705da3171d44d9cbe7be53ff03284d532"
        },
        {
          "url": "https://git.kernel.org/stable/c/51f2c8d2c99fc1f452f7113c08a35edcc4bf8732"
        }
      ],
      "title": "RDMA/rxe: Fix UAF in ODP init error-handling path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90423",
    "datePublished": "2026-09-17T16:09:46.513Z",
    "dateReserved": "2026-09-11T19:38:34.814Z",
    "dateUpdated": "2026-10-19T09:03:27.119Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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