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CVE-2026-72195 (GCVE-0-2026-72195)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-17 05:41
VLAI
Title
fs/ntfs3: bound attr_off in UpdateResidentValue against data_off
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound attr_off in UpdateResidentValue against data_off In do_action()'s UpdateResidentValue case (fslog.c:3307), lrh->attr_off and lrh->redo_len come from the on-disk LRH. When they satisfy aoff + dlen < attr->res.data_off, the assignment attr->res.data_size = cpu_to_le32(aoff + dlen - data_off); underflows to ~4 GiB (e.g. 0xFFFFFFF9 when aoff=0x10, dlen=1, data_off=0x18). Subsequent code that reads attr->res.data_size to walk the resident attribute payload would then read up to 4 GiB past the 1024-byte MFT record allocation. The existing mi_enum_attr() defense in fs/ntfs3/record.c:287 catches the corrupted data_size on the next attribute walk and fails the mount, but only on the path that walks all attributes. A read site that picks an attribute by name and reads its data_size without re-validating is not covered. Validate aoff against data_off and asize at the source. Reproduced under UML+KASAN on mainline 8d90b09e6741 via pr_warn-only probe: with aoff=0x10 and data_off=0x18, the post-assignment data_size is 0xfffffff9 (mount then fails at -22 from mi_enum_attr). [almaz.alexandrovich@paragon-software.com: clang-formatted the changes]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < ab8761676d638c5be170aaf91b7ffdd451236616 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 53c12f178f584dc5f836ffe2782138a6e9348ed9 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 546518468e6c9ea469669eef78f8cc380ad6e2ca (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 97758fd9756b5f09e9ddc6a5f6a569041acc8421 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 50b5e83384e7fed3d11d18b79ff350e9d6d89861 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < a89c66674283a0293c0f266dc57087a6114371a3 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < d1570c48f49a693974d000251030370ee2e83539 (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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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound attr_off in UpdateResidentValue against data_off\n\nIn do_action()\u0027s UpdateResidentValue case (fslog.c:3307),\nlrh-\u003eattr_off and lrh-\u003eredo_len come from the on-disk LRH.\nWhen they satisfy aoff + dlen \u003c attr-\u003eres.data_off, the\nassignment\n\n\tattr-\u003eres.data_size = cpu_to_le32(aoff + dlen - data_off);\n\nunderflows to ~4 GiB (e.g. 0xFFFFFFF9 when aoff=0x10, dlen=1,\ndata_off=0x18).  Subsequent code that reads attr-\u003eres.data_size\nto walk the resident attribute payload would then read up to\n4 GiB past the 1024-byte MFT record allocation.\n\nThe existing mi_enum_attr() defense in fs/ntfs3/record.c:287\ncatches the corrupted data_size on the next attribute walk\nand fails the mount, but only on the path that walks all\nattributes.  A read site that picks an attribute by name and\nreads its data_size without re-validating is not covered.\nValidate aoff against data_off and asize at the source.\n\nReproduced under UML+KASAN on mainline 8d90b09e6741 via\npr_warn-only probe: with aoff=0x10 and data_off=0x18, the\npost-assignment data_size is 0xfffffff9 (mount then fails\nat -22 from mi_enum_attr).\n\n[almaz.alexandrovich@paragon-software.com: clang-formatted the changes]"
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              "value": "AV:L - The bug is reached only when the kernel mounts an attacker-controlled NTFS volume and replays $LogFile via ntfs_loadlog_and_replay\u2192log_replay\u2192do_action(UpdateResidentValue); exploitation uses the local mount syscall on a block/loop device, not a network-facing kernel service.\nAC:L - The attacker fully controls malicious on-disk LRH fields (attr_off, redo_len, data) in $LogFile; triggering the data_size underflow is deterministic once the crafted volume is mounted, with no races or conditions outside attacker control.\nPR:L - Mounting ntfs3 requires CAP_SYS_ADMIN in the mount namespace; an unprivileged local attacker can obtain this via user namespaces (unshare -Ur) and loop-mount a crafted NTFS image, without real root in the initial user namespace.\nUI:N - No victim interaction is required when the attacker mounts their own malicious NTFS image in a user namespace; exploitation does not depend on another user plugging in media, opening a file, or performing an additional action.\nS:U - The vulnerability corrupts kernel heap metadata during filesystem journal replay on the mounting host; impact stays within the kernel\u0027s security authority and does not constitute a VM escape, sandbox escape, or cross-authority boundary change.\nC:H - Unsigned underflow sets attr-\u003eres.data_size to ~4 GiB; subsequent resident-attribute consumers that trust data_size can read far beyond the ~1 KiB kmalloc MFT record allocation, disclosing adjacent kernel heap memory.\nI:H - The underflow corrupts resident-attribute metadata and UpdateResidentValue memmove paths using attacker-controlled offsets can overwrite attribute headers and drive out-of-bounds writes during replay, enabling heap corruption suitable for control-flow hijacking.\nA:H - Malformed journal replay can trigger kernel faults (KASAN/oops) or abort mount; repeated mount attempts against the malicious image cause persistent denial of service on the affected system."
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    "datePublished": "2026-08-15T05:53:54.869Z",
    "dateReserved": "2026-08-09T03:40:39.911Z",
    "dateUpdated": "2026-08-17T05:41:21.899Z",
    "state": "PUBLISHED"
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Subsequent code that reads attr-\u003eres.data_size\\nto walk the resident attribute payload would then read up to\\n4 GiB past the 1024-byte MFT record allocation.\\n\\nThe existing mi_enum_attr() defense in fs/ntfs3/record.c:287\\ncatches the corrupted data_size on the next attribute walk\\nand fails the mount, but only on the path that walks all\\nattributes.  A read site that picks an attribute by name and\\nreads its data_size without re-validating is not covered.\\nValidate aoff against data_off and asize at the source.\\n\\nReproduced under UML+KASAN on mainline 8d90b09e6741 via\\npr_warn-only probe: with aoff=0x10 and data_off=0x18, the\\npost-assignment data_size is 0xfffffff9 (mount then fails\\nat -22 from mi_enum_attr).\\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\":\"ab8761676d638c5be170aaf91b7ffdd451236616\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"53c12f178f584dc5f836ffe2782138a6e9348ed9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"546518468e6c9ea469669eef78f8cc380ad6e2ca\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"97758fd9756b5f09e9ddc6a5f6a569041acc8421\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"50b5e83384e7fed3d11d18b79ff350e9d6d89861\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"a89c66674283a0293c0f266dc57087a6114371a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"d1570c48f49a693974d000251030370ee2e83539\",\"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:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/50b5e83384e7fed3d11d18b79ff350e9d6d89861\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53c12f178f584dc5f836ffe2782138a6e9348ed9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/546518468e6c9ea469669eef78f8cc380ad6e2ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/97758fd9756b5f09e9ddc6a5f6a569041acc8421\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a89c66674283a0293c0f266dc57087a6114371a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ab8761676d638c5be170aaf91b7ffdd451236616\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d1570c48f49a693974d000251030370ee2e83539\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T15:33:08+00:00",
      "cve": "CVE-2026-72195",
      "id": "CVE-2026-72195",
      "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 attr_off in UpdateResidentValue against data_off",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72195.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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  • 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.
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Detection rules are retrieved from Rulezet.