{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e8e3edb95ce6a146bc774b6cfad3553f4383edc8"
            },
            {
              "fixed": "ecadb9137aeaa0615183f8d23eabea2b45c862f1"
            },
            {
              "fixed": "eec130fc9ffbbd08a5d5432683122b79aca2a726"
            },
            {
              "fixed": "d5086911d532b82ca070d944aa08ddde00baefe4"
            },
            {
              "fixed": "0ce48c6ddea1a8e675a2eb0221b62a9950788f3c"
            },
            {
              "fixed": "a82d93fcfdfd26af17049c34319dfdd079cd1901"
            },
            {
              "fixed": "5c349c533e72af2313c3be0f80a24d7407fa4777"
            },
            {
              "fixed": "37be7bc2c2d09c18e939da20224405864a0090b9"
            },
            {
              "fixed": "779aa4c66a96bf43d2d62982ea1a9096a9128d87"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.14.0"
            },
            {
              "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": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93049.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: mtdswap: Avoid freeing registered blktrans device twice\n\nIn mtdswap_add_mtd(), debugfs setup failure after successful blktrans\nregistration can free mbd_dev twice.\n\nadd_mtd_blktrans_dev() initializes the blktrans device reference and\npublishes the disk. Once that succeeds, del_mtd_blktrans_dev() tears the\ndisk down and drops the blktrans reference; when that reference reaches\nzero, blktrans_dev_release() frees the mtd_blktrans_dev.\n\nThe debugfs failure path called del_mtd_blktrans_dev(mbd_dev), then fell\nthrough the common cleanup label and called kfree(mbd_dev) again. Clear\nthe local pointer after deregistration so the common cleanup can still\nrelease the mtdswap state without freeing the blktrans object twice.\n\nThis issue was found by a static analysis checker and confirmed by\nmanual source review.",
  "id": "CVE-2026-93049",
  "modified": "2026-09-19T03:30:35.573687474Z",
  "published": "2026-09-17T16:10:39.679Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93049.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93049"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "mtd: mtdswap: Avoid freeing registered blktrans device twice"
}