{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "820f9442e711a81749e70c40f149fc54c4ce0ca8"
            },
            {
              "fixed": "dec787a15c96a5665e9ffc61b429a6a4ab26e6b9"
            },
            {
              "fixed": "5eea874a696201c31e7c2d7badbfa0d90e9961b5"
            },
            {
              "fixed": "cf239de7fdcc8336259b01ea4bcf650dadad1040"
            },
            {
              "fixed": "6d74ecc2be120a0c300b224b7649fe93c0453714"
            },
            {
              "fixed": "9d44836f60c8c29bcdb1471fd9202387c642a890"
            },
            {
              "fixed": "2e861ce2aaa468351a6a47c4cbb4971ebb740c7b"
            },
            {
              "fixed": "3d60fdf951143d6ef4e352e2f8eb852286701726"
            },
            {
              "fixed": "f42d0fda0c67695db6bc704b04b7c10240805377"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.4.0"
            },
            {
              "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-2026-89548.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: always drain cache_cleaner before destroying a cache_detail\n\nsunrpc_destroy_cache_detail() only cancels the global cache_cleaner\ndelayed_work when cache_list is empty.  During per-netns teardown\ncache_list is never empty because init_net's caches remain registered,\nso the cancel never fires.  After unlink, the caller proceeds to\ncache_destroy_net() which kfrees the cache_detail while cache_clean()\nmay still hold a dangling pointer to it.  The result is a\nuse-after-free: cache_dequeue() takes cd-\u003equeue_lock on freed memory,\nand cache_put() dereferences cd-\u003ecache_put as a function pointer from\nfreed slab.\n\nDrop the list_empty guard so that cancel_delayed_work_sync() always\nruns, ensuring any in-flight cache_clean() completes before the\ncache_detail is freed.  Re-arm the cleaner afterwards if other caches\nare still registered.",
  "id": "CVE-2026-89548",
  "modified": "2026-09-15T03:30:41.706338721Z",
  "published": "2026-09-11T19:44:23.298Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2e861ce2aaa468351a6a47c4cbb4971ebb740c7b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d60fdf951143d6ef4e352e2f8eb852286701726"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5eea874a696201c31e7c2d7badbfa0d90e9961b5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d74ecc2be120a0c300b224b7649fe93c0453714"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d44836f60c8c29bcdb1471fd9202387c642a890"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf239de7fdcc8336259b01ea4bcf650dadad1040"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dec787a15c96a5665e9ffc61b429a6a4ab26e6b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f42d0fda0c67695db6bc704b04b7c10240805377"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89548.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89548"
    },
    {
      "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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SUNRPC: always drain cache_cleaner before destroying a cache_detail"
}