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RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-80864

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-80864

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "82257379061c0a7aba6c77081d988339982af115",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "0136b528b753c5a56e4d997ef20b86bb6750b8fb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "ffa4f0be69656be1755090f02db38d49816585c6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "60dfd47929cd1e7070daa810d40ce538d888410d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "6f7014237405e7f032b5c53a82d9eccf6161c291",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/infiniband/sw/rxe/rxe_qp.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.108",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.49",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.3",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/infiniband/sw/rxe/rxe_qp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80864

Source reference: /cveMetadata/cveId

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Event
#46641 · Revision 1
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