{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "b46acd6a6a627d876898e1c84d3f84902264b445"
            },
            {
              "fixed": "8128bec895075253c779d67afdc90ae513265fca"
            },
            {
              "fixed": "7972df425687daa70d971fe6ed415e78683133dd"
            },
            {
              "fixed": "7ac4c86915c24c208a0f0611b71d9676686fe756"
            },
            {
              "fixed": "29b86dbe88cbbef53bb9aaec2e279359f8c450f8"
            },
            {
              "fixed": "0fad25687d4d3fa1fdd313d31b9cb5817c425029"
            },
            {
              "fixed": "d313416280d41bea272f02a6034dfa88008692a0"
            },
            {
              "fixed": "9611f644302c07d21bc8af97e3e06a3d30064253"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.15.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72193.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: cap RESTART_TABLE free-chain walker at rt-\u003eused\n\nA crafted NTFS3 disk image triggers an in-kernel infinite loop at\nmount time, hanging the mounting thread and firing the soft-lockup\nwatchdog within ~22s on multi-CPU hosts (panic with\nkernel.softlockup_panic=1).  The bug is reachable from desktop USB\nauto-mount on distributions where udisks2 routes the NTFS signature\nto the in-tree ntfs3 driver (Arch family and an increasing fraction\nof Fedora / openSUSE / RHEL deployments); CAP_SYS_ADMIN-class manual\nmount elsewhere.\n\ncheck_rstbl()'s second walker iterates the free-entry singly-linked\nlist headed by rt-\u003efirst_free with no upper bound on iteration count:\n\n  for (off = ff; off;) {\n      if (off == RESTART_ENTRY_ALLOCATED)\n          return false;\n      off = le32_to_cpu(*(__le32 *)Add2Ptr(rt, off));\n      if (off \u003e ts - sizeof(__le32))\n          return false;\n  }\n\nThe existing guards cover three exits: end-of-list (off == 0), the\nin-use marker (off == RESTART_ENTRY_ALLOCATED), and out-of-bounds\n(off \u003e ts - sizeof(__le32)).  None of the three prevents an\nin-bounds cycle.\n\nA crafted on-disk RESTART_TABLE whose free chain contains a\nself-loop or A-\u003eB-\u003eA cycle whose offsets satisfy:\n\n  - in range [sizeof(struct RESTART_TABLE), ts - sizeof(__le32)]\n  - (off - sizeof(struct RESTART_TABLE)) % rsize == 0\n\npasses all existing guards and spins the mount-time thread forever.\nReproduced in UML by hand-forging a 2 MB NTFS3 image whose journal\nRESTART_TABLE first_free = 0x18 and whose entry at offset 0x18\nstores 0x18 as its next pointer; mount of the forged image with\nthe in-tree ntfs3 driver never returns.\n\nBound the walker by rt-\u003eused.  Each entry on a legitimate free\nchain is unique, and the total slot count is ne = le16_to_cpu\n(rt-\u003eused).  A traversal that visits more than ne slots is by\nconstruction malformed; reject it as a corrupt RESTART_TABLE.\n\nAfter this patch, mount of the forged image returns with -EINVAL\nand a log_replay failure message, and mkntfs-produced legitimate\nimages mount cleanly (verified in the same UML harness).",
  "id": "CVE-2026-72193",
  "modified": "2026-08-18T03:31:14.944239114Z",
  "published": "2026-08-15T05:53:53.381Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0fad25687d4d3fa1fdd313d31b9cb5817c425029"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29b86dbe88cbbef53bb9aaec2e279359f8c450f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7972df425687daa70d971fe6ed415e78683133dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7ac4c86915c24c208a0f0611b71d9676686fe756"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8128bec895075253c779d67afdc90ae513265fca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9611f644302c07d21bc8af97e3e06a3d30064253"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d313416280d41bea272f02a6034dfa88008692a0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72193.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72193"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ntfs3: cap RESTART_TABLE free-chain walker at rt-\u003eused"
}