CVE-2026-72193 (GCVE-0-2026-72193)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-17 05:10
VLAI
Title
ntfs3: cap RESTART_TABLE free-chain walker at rt->used
Summary
In the Linux kernel, the following vulnerability has been resolved: ntfs3: cap RESTART_TABLE free-chain walker at rt->used 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()'s second walker iterates the free-entry singly-linked list headed by rt->first_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 > 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 > 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->B->A 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->used. Each entry on a legitimate free chain is unique, and the total slot count is ne = le16_to_cpu (rt->used). 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).
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 8128bec895075253c779d67afdc90ae513265fca (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 7972df425687daa70d971fe6ed415e78683133dd (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 7ac4c86915c24c208a0f0611b71d9676686fe756 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 29b86dbe88cbbef53bb9aaec2e279359f8c450f8 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 0fad25687d4d3fa1fdd313d31b9cb5817c425029 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < d313416280d41bea272f02a6034dfa88008692a0 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 9611f644302c07d21bc8af97e3e06a3d30064253 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "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()\u0027s 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)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:10:01.666Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8128bec895075253c779d67afdc90ae513265fca"
        },
        {
          "url": "https://git.kernel.org/stable/c/7972df425687daa70d971fe6ed415e78683133dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ac4c86915c24c208a0f0611b71d9676686fe756"
        },
        {
          "url": "https://git.kernel.org/stable/c/29b86dbe88cbbef53bb9aaec2e279359f8c450f8"
        },
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/9611f644302c07d21bc8af97e3e06a3d30064253"
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      ],
      "title": "ntfs3: cap RESTART_TABLE free-chain walker at rt-\u003eused",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72193",
    "datePublished": "2026-08-15T05:53:53.381Z",
    "dateReserved": "2026-08-09T03:40:39.911Z",
    "dateUpdated": "2026-08-17T05:10:01.666Z",
    "state": "PUBLISHED"
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      "date": "2026-09-21",
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      "percentile": "0.11702"
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                    "versionType": "git"
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          }
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "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()\u0027s 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",
        "lastModified": "2026-08-17T06:18:19.947",
        "metrics": {},
        "published": "2026-08-15T06:21:37.797",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0fad25687d4d3fa1fdd313d31b9cb5817c425029"
          },
          {
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            "url": "https://git.kernel.org/stable/c/29b86dbe88cbbef53bb9aaec2e279359f8c450f8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7972df425687daa70d971fe6ed415e78683133dd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7ac4c86915c24c208a0f0611b71d9676686fe756"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8128bec895075253c779d67afdc90ae513265fca"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9611f644302c07d21bc8af97e3e06a3d30064253"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d313416280d41bea272f02a6034dfa88008692a0"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T15:32:55+00:00",
      "cve": "CVE-2026-72193",
      "id": "CVE-2026-72193",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ntfs3: cap RESTART_TABLE free-chain walker at rt-\u003eused",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72193.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:28:13Z",
      "cve": "CVE-2026-72193",
      "id": "CVE-2026-72193",
      "initial_release_date": "2026-09-01T13:31:04Z",
      "product_status:known_affected": "123",
      "product_status:known_not_affected": "239",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72193",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72193.json",
      "version": "4"
    }
  }
}



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Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.