CVE-2023-53504 (GCVE-0-2023-53504)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:45 – Updated: 2026-08-05 09:14
VLAI
Title
RDMA/bnxt_re: Properly order ib_device_unalloc() to avoid UAF
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/bnxt_re: Properly order ib_device_unalloc() to avoid UAF ib_dealloc_device() should be called only after device cleanup. Fix the dealloc sequence.
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: 6d758147c7b80a46465f72e9e6294d244ee98a21 , < c95863f6d970ef968e7c1f3c481f72a4b0734654 (git)
Affected: 6d758147c7b80a46465f72e9e6294d244ee98a21 , < 5363fc488da579923edf6a2fdca3d3b651dd800b (git)
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Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.4.11 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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Show details on NVD website

{
  "containers": {
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/bnxt_re/main.c"
          ],
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              "value": "AV:L - The UAF occurs in the bnxt_re auxiliary-device removal path, reachable only from local operations on the host (PCI device unbind/removal, module unload, SR-IOV teardown) and exploited by a local heap-spray to reclaim the freed rdev; there is no remote or adjacent-network trigger.\nAC:L - The use-after-free is unconditional \u2014 every removal frees rdev and then runs the entire bnxt_re_dev_uninit() on it, with no race to win \u2014 and the RCU-deferred free plus multi-second firmware-command waits inside the function give a wide, attacker-influenceable window for reclaiming the allocation.\nPR:L - An unprivileged local user supplies the exploitation half by spraying to reclaim the freed multi-KB rdev allocation, after which the freed-memory writes and pointer dereferences act on attacker-controlled data; NIC teardown (hot-plug, SR-IOV reconfiguration, driver reload) is routine in cloud and container hosts, so no elevated privilege is assumed for the attacker.\nUI:N - No victim interaction is needed \u2014 the teardown occurs automatically via PCI hot-unplug, error-recovery re-probe, SR-IOV changes, or driver reload during upgrades, and the UAF fires unconditionally once it starts.\nS:U - Both the freed object and all corrupted state live in kernel memory under the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed rdev is read extensively after release (rdev-\u003een_dev, rdev-\u003echip_ctx, rdev-\u003ercfw, rdev-\u003eqplib_res/qplib_ctx), so reclaiming the slab lets an attacker leak adjacent kernel data and pointers, and mis-freed DMA/kernel buffers can be re-read.\nI:H - The path performs writes into freed memory (test_and_clear_bit on rdev-\u003eflags, rdev-\u003enum_msix = 0) and kfree/dma_free_coherent on pointers read from the freed struct, yielding a controlled-free and heap-corruption primitive that is leverageable for control-flow hijack.\nA:H - Even unexploited, the UAF corrupts the slab and dereferences stale pointers (bnxt_unregister_dev(rdev-\u003een_dev), chip_ctx teardown), producing KASAN splats, oopses, and kernel panics on every affected device removal."
            }
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    "datePublished": "2025-10-01T11:45:54.977Z",
    "dateReserved": "2025-10-01T11:39:39.404Z",
    "dateUpdated": "2026-08-05T09:14:30.751Z",
    "state": "PUBLISHED"
  },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:17:28+00:00",
      "cve": "CVE-2023-53504",
      "id": "CVE-2023-53504",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "108",
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      "title": "kernel: RDMA/bnxt_re: Properly order ib_device_unalloc() to avoid UAF",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53504.json",
      "version": "3"
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      "cve": "CVE-2023-53504",
      "id": "CVE-2023-53504",
      "initial_release_date": "2025-10-01T23:30:04Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "271",
      "product_status:recommended": "346",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53504",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53504.json",
      "version": "46"
    }
  }
}



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  • 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.
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