{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8700e3e7c4857d28ebaa824509934556da0b3e76"
            },
            {
              "fixed": "0136b528b753c5a56e4d997ef20b86bb6750b8fb"
            },
            {
              "fixed": "ffa4f0be69656be1755090f02db38d49816585c6"
            },
            {
              "fixed": "d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844"
            },
            {
              "fixed": "60dfd47929cd1e7070daa810d40ce538d888410d"
            },
            {
              "fixed": "6f7014237405e7f032b5c53a82d9eccf6161c291"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.8.0"
            },
            {
              "fixed": "6.12.108"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.49"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.13"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.2.0"
            },
            {
              "fixed": "7.2.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80864.json"
  },
  "details": "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.",
  "id": "CVE-2026-80864",
  "modified": "2026-09-06T03:30:57.683043240Z",
  "published": "2026-09-04T15:55:18.791Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0136b528b753c5a56e4d997ef20b86bb6750b8fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/60dfd47929cd1e7070daa810d40ce538d888410d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6f7014237405e7f032b5c53a82d9eccf6161c291"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ffa4f0be69656be1755090f02db38d49816585c6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80864.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80864"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp"
}