writeback: avoid use-after-free after removing device

{
  "id": "f6395ea4b861f03a18c8f26fb62640dc97a84b93e28fc69ddda4de0d43711a0e",
  "url": "https://osv.dev/vulnerability/CVE-2022-49995",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "writeback: avoid use-after-free after removing device",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: writeback: avoid use-after-free after removing device When a disk is removed, bdi_unregister gets called to stop further writeback and wait for associated delayed work to complete. However, wb_inode_writeback_end() may schedule bandwidth estimation dwork after this has completed, which can result in the timer attempting to access the just freed bdi_writeback. Fix this by checking if the bdi_writeback is alive, similar to when scheduling writeback work. Since this requires wb->work_lock, and wb_inode_writeback_end() may get called from interrupt, switch wb->work_lock to an irqsafe lock.",
    "evidence": "osv:CVE-2022-49995",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.64",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.19.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-49995",
      "aliases": [
        "CVE-2022-49995"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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              "type": "GIT",
              "events": [
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                {
                  "fixed": "f96b9f7c1676923bce871e728bb49c0dfa5013cc"
                },
                {
                  "fixed": "9a6c710f3bc10bc9cc23e1c080b53245b7f9d5b7"
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                  "fixed": "f87904c075515f3e1d8f4a7115869d3b914674fd"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49995.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
                },
                {
                  "fixed": "5.15.64"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "5.19.6"
                }
              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49995.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.860109181Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/9a6c710f3bc10bc9cc23e1c080b53245b7f9d5b7",
        "https://git.kernel.org/stable/c/f87904c075515f3e1d8f4a7115869d3b914674fd",
        "https://git.kernel.org/stable/c/f96b9f7c1676923bce871e728bb49c0dfa5013cc",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49995.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49995",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49995.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49995",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491297,
  "published_at": "2025-06-18T11:00:55.352+00:00"
}