CVE-2026-90423 (GCVE-0-2026-90423)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:09 – Updated: 2026-10-19 09:03
VLAI
Title
RDMA/rxe: Fix UAF in ODP init error-handling path
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91 , < 5f1933163327c9f1c8f2a341c6cb551aaf231ff9 (git)
Affected: d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91 , < 4cfb448705da3171d44d9cbe7be53ff03284d532 (git)
Affected: d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91 , < 51f2c8d2c99fc1f452f7113c08a35edcc4bf8732 (git)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_odp.c"
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          "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."
        }
      ],
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            "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": [
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              "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."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:03:27.119Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/51f2c8d2c99fc1f452f7113c08a35edcc4bf8732"
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      "title": "RDMA/rxe: Fix UAF in ODP init error-handling path",
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    "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"
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        "descriptions": [
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            "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."
          }
        ],
        "id": "CVE-2026-90423",
        "lastModified": "2026-10-19T09:19:36.617",
        "metrics": {
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-11-06T01:43:36+00:00",
      "cve": "CVE-2026-90423",
      "id": "CVE-2026-90423",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_not_affected": "203",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/rxe: Fix UAF in ODP init error-handling path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90423.json",
      "version": "3"
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}



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