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CVE-2026-80864 (GCVE-0-2026-80864)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:55 – Updated: 2026-09-04 15:55
VLAI
Title
RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp rxe_qp_from_attr() handles IB_QP_MAX_DEST_RD_ATOMIC outside the IB_QP_STATE path, so it holds no state_lock and runs while the responder task rxe_receiver() (recv_task on rxe_wq) is live. A modify_qp() setting only that attribute calls free_rd_atomic_resources() then alloc_rd_atomic_resources(), swapping qp->resp.resources[] while rxe_prepare_res()/find_resource() walk it; free_rd_atomic_resources() also leaves the cached pointer qp->resp.res dangling. A local unprivileged user can race the free/realloc into a use-after-free in rxe_receiver() (local DoS). Drain recv_task around the swap with rxe_disable_task()/rxe_enable_task(), as rxe_qp_reset() already does when tearing this array down, re-enabling only after alloc_rd_atomic_resources() succeeds so the responder never resumes against a NULL qp->resp.resources on the ENOMEM path. Also clear qp->resp.res in free_rd_atomic_resources(), like the rxe_resp.c completion paths. Reproduced under KASAN; the slab-use-after-free in rxe_receiver() is gone.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < 0136b528b753c5a56e4d997ef20b86bb6750b8fb (git)
Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < ffa4f0be69656be1755090f02db38d49816585c6 (git)
Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844 (git)
Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < 60dfd47929cd1e7070daa810d40ce538d888410d (git)
Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < 6f7014237405e7f032b5c53a82d9eccf6161c291 (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.49 , ≤ 6.18.* (semver)
Unaffected: 7.1.13 , ≤ 7.1.* (semver)
Unaffected: 7.2.3 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_qp.c"
          ],
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "4.8"
            },
            {
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              "status": "unaffected",
              "version": "0",
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              "versionType": "semver"
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              "version": "7.2.3",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp\n\nrxe_qp_from_attr() handles IB_QP_MAX_DEST_RD_ATOMIC outside the\nIB_QP_STATE path, so it holds no state_lock and runs while the responder\ntask rxe_receiver() (recv_task on rxe_wq) is live. A modify_qp() setting\nonly that attribute calls free_rd_atomic_resources() then\nalloc_rd_atomic_resources(), swapping qp-\u003eresp.resources[] while\nrxe_prepare_res()/find_resource() walk it; free_rd_atomic_resources()\nalso leaves the cached pointer qp-\u003eresp.res dangling. A local\nunprivileged user can race the free/realloc into a use-after-free in\nrxe_receiver() (local DoS).\n\nDrain recv_task around the swap with rxe_disable_task()/rxe_enable_task(),\nas rxe_qp_reset() already does when tearing this array down, re-enabling\nonly after alloc_rd_atomic_resources() succeeds so the responder never\nresumes against a NULL qp-\u003eresp.resources on the ENOMEM path. Also clear\nqp-\u003eresp.res in free_rd_atomic_resources(), like the rxe_resp.c\ncompletion paths.\n\nReproduced under KASAN; the slab-use-after-free in rxe_receiver() is gone."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:55:18.791Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/0136b528b753c5a56e4d997ef20b86bb6750b8fb"
        },
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          "url": "https://git.kernel.org/stable/c/ffa4f0be69656be1755090f02db38d49816585c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844"
        },
        {
          "url": "https://git.kernel.org/stable/c/60dfd47929cd1e7070daa810d40ce538d888410d"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f7014237405e7f032b5c53a82d9eccf6161c291"
        }
      ],
      "title": "RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80864",
    "datePublished": "2026-09-04T15:55:18.791Z",
    "dateReserved": "2026-08-26T14:34:25.798Z",
    "dateUpdated": "2026-09-04T15:55:18.791Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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      "cve": "CVE-2026-80864",
      "date": "2026-09-14",
      "epss": "0.00156",
      "percentile": "0.05151"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-80864",
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      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80864.json",
      "version": "1"
    },
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    "suse_vex": {
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      "current_release_date": "2026-09-10T01:50:21Z",
      "cve": "CVE-2026-80864",
      "id": "CVE-2026-80864",
      "initial_release_date": "2026-09-05T00:25:50Z",
      "product_status:known_affected": "337",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80864",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80864.json",
      "version": "4"
    }
  }
}



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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

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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.