CVE-2026-80864

Full vulnerability record from the local CVENow database.

Description

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

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-04 16:18:15.737000

Last modified

2026-10-30 13:20:13.103000

View original CVE JSON

{
  "id": "CVE-2026-80864",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-04T16:18:15.737",
  "lastModified": "2026-10-30T13:20:13.103",
  "vulnStatus": "Received",
  "cveTags": [],
  "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->resp.resources[] while\nrxe_prepare_res()/find_resource() walk it; free_rd_atomic_resources()\nalso leaves the cached pointer qp->resp.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->resp.resources on the ENOMEM path. Also clear\nqp->resp.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."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_qp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "lessThan": "87e40635d77aa19088550698c81eb295d5131f71",
              "versionType": "git",
              "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",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_qp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "4.8",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "4.8",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.160",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.108",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.49",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.13",
              "lessThanOrEqual": "7.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.3",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0136b528b753c5a56e4d997ef20b86bb6750b8fb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/60dfd47929cd1e7070daa810d40ce538d888410d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6f7014237405e7f032b5c53a82d9eccf6161c291",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/82257379061c0a7aba6c77081d988339982af115",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/87e40635d77aa19088550698c81eb295d5131f71",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ffa4f0be69656be1755090f02db38d49816585c6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}