dm-pcache: validate the persisted dirty_tail chain at load

{
  "id": "97ea2575d182a005ece0b7777c840d57ea60d7611c0772c152e9302872cc65e8",
  "url": "https://osv.dev/vulnerability/CVE-2026-93198",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "dm-pcache: validate the persisted dirty_tail chain at load",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: dm-pcache: validate the persisted dirty_tail chain at load The writeback worker follows the persisted dirty_tail chain, which is decoded from the cache device independently of the key_tail chain that cache_replay() walks and bounds. A crafted image, whose on-media fields are authenticated only by a crc32c with a fixed seed, can aim dirty_tail at a chain of last ksets that never terminates, so cache_writeback_fn() re-arms itself with no delay forever. Walk the dirty_tail chain once at load with the same hop cap cache_replay() uses and fail the table load with -EIO if it does not reach an end within n_segs hops.",
    "evidence": "osv:CVE-2026-93198",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-93198",
      "aliases": [
        "CVE-2026-93198"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0"
                },
                {
                  "fixed": "8195cf3f4a82ef49d9b0651c507ed0784caf23fb"
                },
                {
                  "fixed": "4822a030929e0e77aa380722dc42e3e4c9edd346"
                },
                {
                  "fixed": "58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93198.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.18.0"
                },
                {
                  "fixed": "6.18.52"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93198.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.484906921Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4822a030929e0e77aa380722dc42e3e4c9edd346",
        "https://git.kernel.org/stable/c/58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b",
        "https://git.kernel.org/stable/c/8195cf3f4a82ef49d9b0651c507ed0784caf23fb",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93198.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93198",
        "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/2026/93xxx/CVE-2026-93198.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93198",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493115,
  "published_at": "2026-09-17T16:12:20.439+00:00"
}