{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72194",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72194"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "fs/ntfs3: add depth limit to indx_find_buffer to prevent stack overflow",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: add depth limit to indx_find_buffer to prevent stack overflow\n\nindx_find_buffer() recursively descends the B+ tree index with no depth\nlimit.  A crafted NTFS image with circular index node references causes\nunbounded recursion, overflowing the kernel stack and panicking the\nsystem.\n\nThis is reachable by mounting a malicious NTFS filesystem (e.g. from a\nUSB drive via desktop automount) and deleting a file whose index entry\ntriggers the rebalancing fallback path in indx_delete_entry().\n\nAdd a depth parameter and bail out with -EINVAL when it reaches the\nfnd->nodes array bound, matching the constraint already enforced by\nfnd_push() in indx_find().\n\nThe related function indx_find() was previously patched for a similar\ninfinite-loop issue (commit 1732053c8a6b), but indx_find_buffer() was\nmissed.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72194"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/99031d4f63c785d2a985b6a4c64c4256f7117052"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/65357a81f64cb3fbe13b4b937586755e4b3a072f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/96fb64f9da86fd2dbd78fbe9d9e41ae27e12ce34"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/78612f478f9fadcec4f9b3b089970da67ffb47e9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/908c9243ba309997b73cbda3e4c563d0fb345ee9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fdf50c788e0991e42a187ff75479a0df7fb752f1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1ebd684b8f627f75bc3e03f8b2ad8400fd1f02cd"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - ntfs3 registers export_operations; on NAS/hybrid servers exporting an NTFS volume via nfsd or ksmbd, a remote client's unlink reaches vfs_unlink\u2192ntfs_unlink_inode\u2192ni_remove_name\u2192indx_delete_entry\u2192indx_find_buffer without any local syscall from the attacker.\nAC:L - The attacker fully controls on-disk INDEX_ENTRY VCN pointers and can craft circular B+ tree references so indx_find_buffer() recurses deterministically until stack exhaustion; no race, special heap layout, or other uncontrollable condition is required beyond presenting the image and issuing unlink.\nPR:N - Exploitation requires only supplying a malicious NTFS image later mounted by root/udisks2/automount, or write permission on an NFS/SMB-exported NTFS share (including guest/anonymous write); no init-namespace root, CAP_SYS_ADMIN, or other elevated host credentials are needed on the trigger path.\nUI:N - Once an administrator has mounted and optionally exported the NTFS volume\u2014or desktop/kiosk automount has attached removable media\u2014the attacker issues unlink directly; no further victim clicks, file opens, or cooperative actions beyond that standing configuration are required.\nS:U - Impact is kernel stack overflow and panic within the host kernel's security authority; this is standard local or network filesystem exploitation, not a VM escape, IOMMU bypass, or cross-scope sandbox breakout.\nC:H - Unbounded recursion overflows the kernel stack, corrupting stack memory before the guard-page fault; under overestimation guidance, kernel stack corruption is treated as potentially enabling arbitrary kernel memory disclosure or information leakage via control-data overwrite.\nI:H - Recursive stack exhaustion corrupts return addresses and adjacent stack frames on the kernel stack, plausibly enabling control-flow hijack or arbitrary kernel modification even though the immediate failure mode is a panic.\nA:H - The fix commit and call path confirm unbounded recursion overflows the kernel stack and panics the system; any kernel oops, stack guard fault, or panic from this path scores Availability High."
    }
  }
}