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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: fix race condition on rdma-\u003estate in trans_rdma.c\n\nThe rdma-\u003estate field is modified without holding req_lock in both\nrecv_done() and p9_cm_event_handler(), while rdma_request() accesses\nthe same field under the req_lock spinlock. This inconsistent locking\ncreates a race condition:\n\n- recv_done() running in softirq completion context sets\n  rdma-\u003estate = P9_RDMA_FLUSHING without acquiring req_lock\n\n- p9_cm_event_handler() modifies rdma-\u003estate at multiple points\n  (ADDR_RESOLVED, ROUTE_RESOLVED, ESTABLISHED, CLOSED) without\n  req_lock\n\n- rdma_request() uses spin_lock_irqsave(\u0026rdma-\u003ereq_lock, flags) to\n  protect the read-modify-write of rdma-\u003estate\n\nThe race can cause lost state transitions: recv_done() or the CM\nevent handler could set state to FLUSHING/CLOSED while rdma_request()\nis concurrently checking or modifying state under the lock, leading to\nthe FLUSHING transition being silently overwritten by CLOSING. This\ncorrupts the connection state machine and can cause use-after-free on\nRDMA request objects during teardown.\n\nFix by adding req_lock protection to all rdma-\u003estate modifications in\nrecv_done() and p9_cm_event_handler(), matching the pattern already\nused in rdma_request(). Use spin_lock_irqsave/spin_unlock_irqrestore\nin the CM event handler since it can race with recv_done() which runs\nin softirq context.\n\nTested with a kernel module that races two threads (simulating\nrdma_request and recv_done/CM handler) on rdma-\u003estate with proper\nlocking: 5.5M+ FLUSHING writes over 27M iterations with 0 lost\ntransitions."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The 9p RDMA client processes RDMA receive completions and CM disconnect events from the remote peer in recv_done() and p9_cm_event_handler(); a malicious or compromised 9p server over RoCE/iWARP can trigger err_out and concurrent teardown without local access.\nAC:L - The attacker controls both sides of the race by sending malformed 9p RDMA replies to drive recv_done() into err_out while forcing disconnects and concurrent rdma_request() error paths; no uncontrollable memory layout or rare victim state is required.\nPR:N - A remote malicious 9p RDMA server needs no credentials on the victim kernel; HPC clusters and virtio-9p backends with persistent trans=rdma mounts let the server alone time malformed replies against in-flight client requests.\nUI:N - No per-attack victim action is needed on existing 9p RDMA mounts\u2014automated workloads, parallel I/O, and server-initiated RDMA disconnects concurrently reach recv_done() and rdma_request() during normal filesystem operation.\nS:U - Impact is kernel heap corruption and local privilege escalation within the victim kernel security domain; UAF on p9_req_t during RDMA teardown does not cross VM, container, or IOMMU isolation boundaries.\nC:H - Lost FLUSHING state transitions corrupt the connection teardown state machine and cause use-after-free on RDMA request (p9_req_t) objects; UAF provides attacker-influenced freed-heap contents usable for arbitrary kernel memory disclosure.\nI:H - Corrupted rdma-\u003estate frees in-flight p9_req_t structures while send_done() and p9_client_cb() still hold references, enabling heap grooming and arbitrary kernel write or control-flow hijack primitives.\nA:H - Use-after-free during RDMA request teardown causes kernel oops or panic when dangling p9_req_t objects are accessed, and state-machine corruption alone can hang or crash the 9p RDMA transport."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:44:52.224Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4cee2b8766045059d5e0b8114837b4a8efe827ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/5424138848eb7d7d8a7196676e90a2cbf2142454"
        },
        {
          "url": "https://git.kernel.org/stable/c/3970a19a80de530b801b6256354d4a529a9a2d6c"
        },
        {
          "url": "https://git.kernel.org/stable/c/8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b"
        },
        {
          "url": "https://git.kernel.org/stable/c/151f8cf5b23d8a534d884432a82a6d54d5a61989"
        },
        {
          "url": "https://git.kernel.org/stable/c/13bf9879b778b2f4b260b45bed18f31806120d1e"
        },
        {
          "url": "https://git.kernel.org/stable/c/ebbcbe5c0db215feecc17def06178da443f4eea6"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d54894a1ee265a72d70f7cae1da6cc774cccc71"
        }
      ],
      "title": "net/9p: fix race condition on rdma-\u003estate in trans_rdma.c",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72491",
    "datePublished": "2026-08-15T05:57:26.281Z",
    "dateReserved": "2026-08-09T03:40:39.936Z",
    "dateUpdated": "2026-08-17T05:44:52.224Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

{
  "affected": [],
  "aliases": [
    "CVE-2026-72491"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:23Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: fix race condition on rdma-\u003estate in trans_rdma.c\n\nThe rdma-\u003estate field is modified without holding req_lock in both\nrecv_done() and p9_cm_event_handler(), while rdma_request() accesses\nthe same field under the req_lock spinlock. This inconsistent locking\ncreates a race condition:\n\n- recv_done() running in softirq completion context sets\n  rdma-\u003estate = P9_RDMA_FLUSHING without acquiring req_lock\n\n- p9_cm_event_handler() modifies rdma-\u003estate at multiple points\n  (ADDR_RESOLVED, ROUTE_RESOLVED, ESTABLISHED, CLOSED) without\n  req_lock\n\n- rdma_request() uses spin_lock_irqsave(\u0026rdma-\u003ereq_lock, flags) to\n  protect the read-modify-write of rdma-\u003estate\n\nThe race can cause lost state transitions: recv_done() or the CM\nevent handler could set state to FLUSHING/CLOSED while rdma_request()\nis concurrently checking or modifying state under the lock, leading to\nthe FLUSHING transition being silently overwritten by CLOSING. This\ncorrupts the connection state machine and can cause use-after-free on\nRDMA request objects during teardown.\n\nFix by adding req_lock protection to all rdma-\u003estate modifications in\nrecv_done() and p9_cm_event_handler(), matching the pattern already\nused in rdma_request(). Use spin_lock_irqsave/spin_unlock_irqrestore\nin the CM event handler since it can race with recv_done() which runs\nin softirq context.\n\nTested with a kernel module that races two threads (simulating\nrdma_request and recv_done/CM handler) on rdma-\u003estate with proper\nlocking: 5.5M+ FLUSHING writes over 27M iterations with 0 lost\ntransitions.",
  "id": "GHSA-gf38-f295-35cc",
  "modified": "2026-08-17T06:33:33Z",
  "published": "2026-08-15T06:32:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72491"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/13bf9879b778b2f4b260b45bed18f31806120d1e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/151f8cf5b23d8a534d884432a82a6d54d5a61989"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3970a19a80de530b801b6256354d4a529a9a2d6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4cee2b8766045059d5e0b8114837b4a8efe827ac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5424138848eb7d7d8a7196676e90a2cbf2142454"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d54894a1ee265a72d70f7cae1da6cc774cccc71"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ebbcbe5c0db215feecc17def06178da443f4eea6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}