CVE-2026-98868

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: dm-pcache: reject a kset that overruns its segment cache_replay(), the writeback worker and the GC worker read a kset of get_kset_onmedia_size() bytes and advance the position by it. A forged key_num makes that size exceed the segment's remaining space, so the advance walks past the segment and trips the cache_pos_advance() BUG_ON. Reject a kset whose on-media size exceeds cache_seg_remain() before use.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-18 16:17:41.320000

Last modified

2026-10-19 10:19:50.843000

View original CVE JSON

{
  "id": "CVE-2026-98868",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-18T16:17:41.320",
  "lastModified": "2026-10-19T10:19:50.843",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: reject a kset that overruns its segment\n\ncache_replay(), the writeback worker and the GC worker read a kset of\nget_kset_onmedia_size() bytes and advance the position by it. A forged\nkey_num makes that size exceed the segment's remaining space, so the\nadvance walks past the segment and trips the cache_pos_advance() BUG_ON.\n\nReject a kset whose on-media size exceeds cache_seg_remain() before use."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/md/dm-pcache/cache_gc.c",
            "drivers/md/dm-pcache/cache_key.c",
            "drivers/md/dm-pcache/cache_writeback.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0",
              "lessThan": "01a700e9278da5706c865b9ca3ae70fdb7b4531d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0",
              "lessThan": "96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0",
              "lessThan": "7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/md/dm-pcache/cache_gc.c",
            "drivers/md/dm-pcache/cache_key.c",
            "drivers/md/dm-pcache/cache_writeback.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.18",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.18",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.52",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.10",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/01a700e9278da5706c865b9ca3ae70fdb7b4531d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}