{
  "cveId": "CVE-2026-72193",
  "url": "https://patchblox.com/security/cve/CVE-2026-72193",
  "summary": "CVE-2026-72193 is fixed in 56 products on 1 platform, first by DEBIAN-CVE-2026-72193, released August 15, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ntfs3: cap RESTART_TABLE free-chain walker at rt...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ntfs3: cap RESTART_TABLE free-chain walker at rt-\u003Eused  A crafted NTFS3 disk image triggers an in-kernel infinite loop at mount time, hanging the mounting thread and firing the soft-lockup watchdog within ~22s on multi-CPU hosts (panic with kernel.softlockup_panic=1).  The bug is reachable from desktop USB auto-mount on distributions where udisks2 routes the NTFS signature to the in-tree ntfs3 driver (Arch family and an increasing fraction of Fedora / openSUSE / RHEL deployments); CAP_SYS_ADMIN-class manual mount elsewhere.  check_rstbl()\u0027s second walker iterates the free-entry singly-linked list headed by rt-\u003Efirst_free with no upper bound on iteration count:    for (off = ff; off;) {       if (off == RESTART_ENTRY_ALLOCATED)           return false;       off = le32_to_cpu(*(__le32 *)Add2Ptr(rt, off));       if (off \u003E ts - sizeof(__le32))           return false;   }  The existing guards cover three exits: end-of-list (off == 0), the in-use marker (off == RESTART_ENTRY_ALLOCATED), and out-of-bounds (off \u003E ts - sizeof(__le32)).  None of the three prevents an in-bounds cycle.  A crafted on-disk RESTART_TABLE whose free chain contains a self-loop or A-\u003EB-\u003EA cycle whose offsets satisfy:    - in range [sizeof(struct RESTART_TABLE), ts - sizeof(__le32)]   - (off - sizeof(struct RESTART_TABLE)) % rsize == 0  passes all existing guards and spins the mount-time thread forever. Reproduced in UML by hand-forging a 2 MB NTFS3 image whose journal RESTART_TABLE first_free = 0x18 and whose entry at offset 0x18 stores 0x18 as its next pointer; mount of the forged image with the in-tree ntfs3 driver never returns.  Bound the walker by rt-\u003Eused.  Each entry on a legitimate free chain is unique, and the total slot count is ne = le16_to_cpu (rt-\u003Eused).  A traversal that visits more than ne slots is by construction malformed; reject it as a corrupt RESTART_TABLE.  After this patch, mount of the forged image returns with -EINVAL and a log_replay failure message, and mkntfs-produced legitimate images mount cleanly (verified in the same UML harness).",
  "published": "2026-08-15T06:21:37Z",
  "severity": "important",
  "epss": 0.00215,
  "epssPercentile": 0.11909,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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      "released": "2026-08-31T09:00:00Z"
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    }
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}