{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "bfd241600a3b0db4fe43c859f1460d0a958d924a"
            },
            {
              "fixed": "9accc25e5af0bac8479f6054e674b2c593c45281"
            },
            {
              "fixed": "6f66d38e2a6c78d48723ea17ad86135ec80ca24b"
            },
            {
              "fixed": "d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f"
            },
            {
              "fixed": "edb20e8c03aebacb409968c99d046f509c6c485a"
            },
            {
              "fixed": "011479cf9a7657d4a3e7cc42a784ac63df594170"
            },
            {
              "fixed": "9d04d64ad192439835ed9884d767353061c3ed6f"
            },
            {
              "fixed": "8f766d2d0b4dabf54f8b35812df2b4f481d13316"
            },
            {
              "fixed": "f6310491c4cdb88af73aa551ec9df1f10a90c709"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.19"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89549.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: route to a populated pool in svc_pool_for_cpu()\n\nsvc_set_num_threads() spreads the requested threads evenly across the\nservice's pools (base = nrservs / sv_nrpools).  When a service runs\nfewer threads than it has pools -- e.g. an nfsd configured with fewer\nthreads than the host has NUMA nodes while running in \"pernode\" or\n\"percpu\" mode -- the trailing pools are left with no threads at all.\n\nsvc_xprt_enqueue() selects a pool from the CPU servicing the transport,\nqueues the transport on that pool's sp_xprts, and only wakes a thread\nfrom the same pool.  Each thread services exclusively its own pool, so a\ntransport that lands on a threadless pool is enqueued on sp_xprts and\nnever picked up: the connection hangs indefinitely.\n\nHave svc_pool_for_cpu() skip pools that currently have no threads,\nfalling back to the next populated pool.  This trades NUMA locality for\na guarantee that the work is actually serviced.  sp_nrthreads is only\nupdated under the service mutex; the lockless read here is a best-effort\nrouting hint, so annotate it with data_race().",
  "id": "CVE-2026-89549",
  "modified": "2026-09-15T03:30:54.741075461Z",
  "published": "2026-09-11T19:44:23.928Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/011479cf9a7657d4a3e7cc42a784ac63df594170"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6f66d38e2a6c78d48723ea17ad86135ec80ca24b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8f766d2d0b4dabf54f8b35812df2b4f481d13316"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9accc25e5af0bac8479f6054e674b2c593c45281"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d04d64ad192439835ed9884d767353061c3ed6f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/edb20e8c03aebacb409968c99d046f509c6c485a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f6310491c4cdb88af73aa551ec9df1f10a90c709"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89549.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89549"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "sunrpc: route to a populated pool in svc_pool_for_cpu()"
}