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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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          "product": "Linux",
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              "status": "unaffected",
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      "cpeApplicability": [
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                  "versionEndExcluding": "6.12.97",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              ],
              "negate": false,
              "operator": "OR"
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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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          "url": "https://git.kernel.org/stable/c/0fad25687d4d3fa1fdd313d31b9cb5817c425029"
        },
        {
          "url": "https://git.kernel.org/stable/c/d313416280d41bea272f02a6034dfa88008692a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/9611f644302c07d21bc8af97e3e06a3d30064253"
        }
      ],
      "title": "ntfs3: cap RESTART_TABLE free-chain walker at rt-\u003eused",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-72193",
      "date": "2026-09-04",
      "epss": "0.00211",
      "percentile": "0.11344"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-72193\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:21:37.797\",\"lastModified\":\"2026-08-17T06:18:19.947\",\"vulnStatus\":\"Received\",\"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).\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ntfs3/fslog.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"8128bec895075253c779d67afdc90ae513265fca\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"7972df425687daa70d971fe6ed415e78683133dd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"7ac4c86915c24c208a0f0611b71d9676686fe756\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"29b86dbe88cbbef53bb9aaec2e279359f8c450f8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"0fad25687d4d3fa1fdd313d31b9cb5817c425029\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"d313416280d41bea272f02a6034dfa88008692a0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"9611f644302c07d21bc8af97e3e06a3d30064253\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ntfs3/fslog.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0fad25687d4d3fa1fdd313d31b9cb5817c425029\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "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"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.