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CVE-2026-72197 (GCVE-0-2026-72197)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-17 05:41
VLAI
Title
fs/ntfs3: bound DeleteIndexEntryAllocation memmove length
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound DeleteIndexEntryAllocation memmove length In do_action()'s DeleteIndexEntryAllocation case, e->size comes from an on-disk INDEX_BUFFER entry. When e->size makes e + e->size point past hdr + hdr->used, PtrOffset(e1, Add2Ptr(hdr, used)) returns a negative ptrdiff_t that is silently cast to a quasi-infinite size_t when passed to memmove(). The memmove then walks past the destination buffer. The sibling DeleteIndexEntryRoot case at fslog.c:3540-3543 already carries the corresponding guard: if (PtrOffset(e1, Add2Ptr(hdr, used)) < esize || Add2Ptr(e, esize) > Add2Ptr(lrh, rec_len) || used + esize > le32_to_cpu(hdr->total)) { goto dirty_vol; } Apply the same shape to the allocation-path case. Also reject esize == 0: memmove(e, e, ...) is a no-op and leaves hdr->used unchanged, hiding a malformed entry from the existing check_index_header() walk. Reproduced under UML+KASAN on mainline 8d90b09e6741 by mounting a crafted NTFS image: the unguarded memmove takes a length of 0xffffffffffffff00 and the kernel oopses in memmove+0x81/0x1a0 on the do_action+0x36a2 frame. [almaz.alexandrovich@paragon-software.com: clang-formatted the changes]
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < c38ed2ab62fab75fd6d0fdc2bee540fbebc7b959 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < b509b9613f20dc5b653d54bf78fab00d79cc43c8 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 4c8aac931c1cd70347961ba5157aa916448c6a25 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < f383aae59ec3994c14804f4191c59038b206be81 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 09fddd52c1b0cef2c086d61be8f3d5dc92e36565 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 554700c65d398276cb00a8ef95f1d5e00b9eff93 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < fc4626bb3656362de8b0ecd56605d47a19ec3518 (git)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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{
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound DeleteIndexEntryAllocation memmove length\n\nIn do_action()\u0027s DeleteIndexEntryAllocation case, e-\u003esize comes\nfrom an on-disk INDEX_BUFFER entry.  When e-\u003esize makes\ne + e-\u003esize point past hdr + hdr-\u003eused,\nPtrOffset(e1, Add2Ptr(hdr, used)) returns a negative ptrdiff_t\nthat is silently cast to a quasi-infinite size_t when passed\nto memmove().  The memmove then walks past the destination\nbuffer.\n\nThe sibling DeleteIndexEntryRoot case at fslog.c:3540-3543\nalready carries the corresponding guard:\n\n\tif (PtrOffset(e1, Add2Ptr(hdr, used)) \u003c esize ||\n\t    Add2Ptr(e, esize) \u003e Add2Ptr(lrh, rec_len) ||\n\t    used + esize \u003e le32_to_cpu(hdr-\u003etotal)) {\n\t\tgoto dirty_vol;\n\t}\n\nApply the same shape to the allocation-path case.  Also reject\nesize == 0: memmove(e, e, ...) is a no-op and leaves\nhdr-\u003eused unchanged, hiding a malformed entry from the\nexisting check_index_header() walk.\n\nReproduced under UML+KASAN on mainline 8d90b09e6741 by\nmounting a crafted NTFS image: the unguarded memmove takes a\nlength of 0xffffffffffffff00 and the kernel oopses in\nmemmove+0x81/0x1a0 on the do_action+0x36a2 frame.\n\n[almaz.alexandrovich@paragon-software.com: clang-formatted the changes]"
        }
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        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:L - Reachable only by mounting attacker-controlled NTFS media via the local mount syscall path (path_mount\u2192ntfs_fill_super\u2192ntfs_loadlog_and_replay\u2192log_replay\u2192do_action); ntfs3 parses on-disk $LogFile redo records, not remote network packets.\nAC:L - The attacker fully controls crafted $LogFile DeleteIndexEntryAllocation redo data and INDEX_BUFFER entry sizes on disk, so the PtrOffset underflow to ~0xffffffffffffff00 and subsequent memmove OOB are deterministic with no race or uncontrollable layout preconditions.\nPR:N - No privileges on the target are required; exploitation only needs a malicious NTFS image presented to ntfs3 (USB/loop/NBD block device) that root, udisks2/systemd automount, or an image-handling service mounts, matching the kernel CNA model for crafted-filesystem bugs.\nUI:N - On desktops/kiosks/automotive systems where udisks2 or systemd automounts removable NTFS media, inserting or attaching the crafted image triggers log_replay during mount with no further deliberate victim action beyond routine media handling.\nS:U - The quasi-infinite memmove corrupts kernel heap memory within the host OS security authority during ntfs3 journal replay; this is standard kernel memory corruption, not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - The unchecked memmove length (~0xffffffffffffff00) performs a massive out-of-bounds read from beyond the kmalloc INDEX_BUFFER scratch buffer, exposing adjacent slab/heap contents and satisfying OOB-read/arbitrary-disclosure guidance even though KASAN reports an oops in memmove.\nI:H - The same memmove writes far past the destination INDEX_BUFFER allocation in kernel heap, yielding a large out-of-bounds write primitive that can corrupt adjacent kernel objects and be leveraged for control-flow hijacking or privilege escalation.\nA:H - Reproduced by mounting a crafted NTFS image under UML+KASAN, the unbounded memmove oopses the kernel in memmove from do_action; such heap corruption reliably threatens panic/oops and full denial of service on mount."
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        "dateUpdated": "2026-08-17T05:41:24.114Z",
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      "title": "fs/ntfs3: bound DeleteIndexEntryAllocation memmove length",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72197",
    "datePublished": "2026-08-15T05:53:56.149Z",
    "dateReserved": "2026-08-09T03:40:39.911Z",
    "dateUpdated": "2026-08-17T05:41:24.114Z",
    "state": "PUBLISHED"
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The memmove then walks past the destination\\nbuffer.\\n\\nThe sibling DeleteIndexEntryRoot case at fslog.c:3540-3543\\nalready carries the corresponding guard:\\n\\n\\tif (PtrOffset(e1, Add2Ptr(hdr, used)) \u003c esize ||\\n\\t    Add2Ptr(e, esize) \u003e Add2Ptr(lrh, rec_len) ||\\n\\t    used + esize \u003e le32_to_cpu(hdr-\u003etotal)) {\\n\\t\\tgoto dirty_vol;\\n\\t}\\n\\nApply the same shape to the allocation-path case.  Also reject\\nesize == 0: memmove(e, e, ...) is a no-op and leaves\\nhdr-\u003eused unchanged, hiding a malformed entry from the\\nexisting check_index_header() walk.\\n\\nReproduced under UML+KASAN on mainline 8d90b09e6741 by\\nmounting a crafted NTFS image: the unguarded memmove takes a\\nlength of 0xffffffffffffff00 and the kernel oopses in\\nmemmove+0x81/0x1a0 on the do_action+0x36a2 frame.\\n\\n[almaz.alexandrovich@paragon-software.com: clang-formatted the changes]\"}],\"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\":\"c38ed2ab62fab75fd6d0fdc2bee540fbebc7b959\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"b509b9613f20dc5b653d54bf78fab00d79cc43c8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"4c8aac931c1cd70347961ba5157aa916448c6a25\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"f383aae59ec3994c14804f4191c59038b206be81\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"09fddd52c1b0cef2c086d61be8f3d5dc92e36565\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"554700c65d398276cb00a8ef95f1d5e00b9eff93\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"fc4626bb3656362de8b0ecd56605d47a19ec3518\",\"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\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/09fddd52c1b0cef2c086d61be8f3d5dc92e36565\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4c8aac931c1cd70347961ba5157aa916448c6a25\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/554700c65d398276cb00a8ef95f1d5e00b9eff93\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b509b9613f20dc5b653d54bf78fab00d79cc43c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c38ed2ab62fab75fd6d0fdc2bee540fbebc7b959\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f383aae59ec3994c14804f4191c59038b206be81\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc4626bb3656362de8b0ecd56605d47a19ec3518\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T15:33:24+00:00",
      "cve": "CVE-2026-72197",
      "id": "CVE-2026-72197",
      "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: fs/ntfs3: bound DeleteIndexEntryAllocation memmove length",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72197.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.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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