cve-2026-99256

{
  "affected": [
    {
      "database_specific": {
        "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99256.json"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "b29d4986d0da1a27cd35917cdb433672f5c95d7f"
            },
            {
              "fixed": "0c7a8cad7c96012a9157a189649e569d0390f384"
            },
            {
              "fixed": "f5db935d257023c3ef410bd39163b949b0e5a55d"
            },
            {
              "fixed": "6290507ecc0dd6dd40759729cbbbd49b1d2a63c4"
            },
            {
              "fixed": "8433fd005c25fd127021f67c9144a879fb585572"
            },
            {
              "fixed": "2f2cfa16dd0f4179bb988139dd37d00a42324f6c"
            },
            {
              "fixed": "73df2ff409f3db95029982fe3656329568e3715d"
            },
            {
              "fixed": "104f09e02038b0fc6bbb718b3976af029e15c1d0"
            },
            {
              "fixed": "bc9781c0247de107876f32929f1637db93a42b34"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "database_specific": {
        "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99256.json"
      },
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.12.0"
            },
            {
              "fixed": "5.10.273"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.224"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.191"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.161"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.115"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.59"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99256.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm cache: fix issue with background work locking\n\ndm cache used a rw_semaphore for background_work_lock. Write locks on\nrw_semaphores have strict owner semantics, but there was no guarantee\nthat the process that locked background_work_lock was the same process\nthat unlocked it. This can be easily seen using a kernel compiled with\nCONFIG_DEBUG_RWSEMS. Given a dm cache device <cache>, run: 'dmsetup\nsuspend <cache> && dmsetup resume <cache>'. This will trigger a kernel\nwarning:\n\nDEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE))\n\ntriggered by cache_resume(). To fix this, switch from a rw_semaphore to\na spinlock and a wait queue. dm cache already has a wait queue and\nassociated counter, migration_wait and nr_allocated_migrations, that was\ngetting woken up when background work was getting completed, but wasn't\nactually used by anything. This is replaced by the background_work queue\nand counter.",
  "id": "CVE-2026-99256",
  "modified": "2026-11-05T03:31:30.252826523Z",
  "published": "2026-11-03T11:25:14.077Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c7a8cad7c96012a9157a189649e569d0390f384"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/104f09e02038b0fc6bbb718b3976af029e15c1d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f2cfa16dd0f4179bb988139dd37d00a42324f6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6290507ecc0dd6dd40759729cbbbd49b1d2a63c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73df2ff409f3db95029982fe3656329568e3715d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8433fd005c25fd127021f67c9144a879fb585572"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc9781c0247de107876f32929f1637db93a42b34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f5db935d257023c3ef410bd39163b949b0e5a55d"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99256.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99256"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.2",
  "summary": "dm cache: fix issue with background work locking"
}