CVE-2026-72196 (GCVE-0-2026-72196)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-17 05:41
VLAI
Title
fs/ntfs3: bound copy_lcns dp->page_lcns[] index in analysis pass
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound copy_lcns dp->page_lcns[] index in analysis pass In log_replay()'s analysis pass, after find_dp() returns a valid DIR_PAGE_ENTRY for the (target_attr, target_vcn) tuple, the copy_lcns block walks lrh->lcns_follow further entries: t16 = le16_to_cpu(lrh->lcns_follow); for (i = 0; i < t16; i++) { size_t j = (size_t)(le64_to_cpu(lrh->target_vcn) - le64_to_cpu(dp->vcn)); dp->page_lcns[j + i] = lrh->page_lcns[i]; } find_dp() only validates that target_vcn falls within [dp->vcn, dp->vcn + dp->lcns_follow), i.e., that the FIRST cluster is covered. The walk through the further entries is not bounded against dp->lcns_follow. For a malformed LRH where target_vcn = dp->vcn + dp->lcns_follow - 1 and lrh->lcns_follow > 1, the i > 0 writes overflow the dp's allocated page_lcns[] array. Add the missing j + lrh->lcns_follow <= dp->lcns_follow guard. Reproduced under UML+KASAN on mainline 8d90b09e6741 as a slab-out-of-bounds write of size 8 from log_replay+0x68d4 on the mount path. This is distinct from Pavitra Jha's 2026-05-02 patch ("fs/ntfs3: validate lcns_follow in log_replay conversion", <20260502154252.164586-1-jhapavitra98@gmail.com>) which addresses the separate version-0 dirty-page-table conversion path's memmove(&dp->vcn, ...) call. The two fixes are complementary; both should land. [almaz.alexandrovich@paragon-software.com: clang-formatted the changes, fixed conflicts]
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 , < 9b3d8cc9d54fcded4de51b2b1026ae7182512077 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 9b7c28d8c61bdb041936222a09a708531a1c2921 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 0f13e823bf86bd1800168ea0bb5bca8b8500a81c (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < d240cd98f5f7b65c90f6b2b6abe3232ccdc405ab (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 49c86dae0c0ccb8d98ddcdc46987259389c816dd (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 5e7b598660cfa8e5af172cf4c65cffc126333307 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 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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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound copy_lcns dp-\u003epage_lcns[] index in analysis pass\n\nIn log_replay()\u0027s analysis pass, after find_dp() returns a\nvalid DIR_PAGE_ENTRY for the (target_attr, target_vcn) tuple,\nthe copy_lcns block walks lrh-\u003elcns_follow further entries:\n\n\tt16 = le16_to_cpu(lrh-\u003elcns_follow);\n\tfor (i = 0; i \u003c t16; i++) {\n\t    size_t j = (size_t)(le64_to_cpu(lrh-\u003etarget_vcn) -\n\t                        le64_to_cpu(dp-\u003evcn));\n\t    dp-\u003epage_lcns[j + i] = lrh-\u003epage_lcns[i];\n\t}\n\nfind_dp() only validates that target_vcn falls within\n[dp-\u003evcn, dp-\u003evcn + dp-\u003elcns_follow), i.e., that the FIRST\ncluster is covered.  The walk through the further entries is\nnot bounded against dp-\u003elcns_follow.  For a malformed LRH\nwhere target_vcn = dp-\u003evcn + dp-\u003elcns_follow - 1 and\nlrh-\u003elcns_follow \u003e 1, the i \u003e 0 writes overflow the dp\u0027s\nallocated page_lcns[] array.\n\nAdd the missing j + lrh-\u003elcns_follow \u003c= dp-\u003elcns_follow guard.\n\nReproduced under UML+KASAN on mainline 8d90b09e6741 as a\nslab-out-of-bounds write of size 8 from log_replay+0x68d4 on\nthe mount path.\n\nThis is distinct from Pavitra Jha\u0027s 2026-05-02 patch\n(\"fs/ntfs3: validate lcns_follow in log_replay conversion\",\n\u003c20260502154252.164586-1-jhapavitra98@gmail.com\u003e) which\naddresses the separate version-0 dirty-page-table conversion\npath\u0027s memmove(\u0026dp-\u003evcn, ...) call.  The two fixes are\ncomplementary; both should land.\n\n[almaz.alexandrovich@paragon-software.com: clang-formatted the changes,\nfixed conflicts]"
        }
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              "value": "AV:L - The flaw is in ntfs3 log_replay() during mount when parsing a crafted $LogFile on a block device; exploitation requires a local mount syscall or auto-mount of attacker-supplied removable media, not delivery through a network-facing kernel protocol handler.\nAC:L - An attacker fully controls malicious NTFS $LogFile journal fields (target_vcn, lcns_follow, page_lcns) and can craft the dirty-page-table state; KASAN reliably reproduced the slab OOB write on mount with no races or attacker-uncontrollable conditions.\nPR:N - No account or privileges on the victim are needed when a crafted NTFS volume on removable media is auto-mounted by udisks/systemd as root; alternatively an unprivileged user can trigger replay via user-namespace mount with CAP_SYS_ADMIN.\nUI:N - Once an attacker mounts or causes mount of a crafted NTFS image, log_replay() runs automatically inside ntfs_fill_super() with no further user interaction; the vulnerable copy_lcns path is reached during standard journal analysis on every affected mount attempt.\nS:U - Exploitation corrupts kernel heap memory during ntfs3 journal replay in the mounting process context; impact is privilege escalation within the same kernel/host security boundary, not a VM-guest-to-host or IOMMU boundary crossing.\nC:H - KASAN confirmed a slab out-of-bounds write of 8 bytes past dp-\u003epage_lcns[] in a kmalloc-backed DIR_PAGE_ENTRY; such heap corruption can overwrite adjacent slab objects and be groomed into arbitrary kernel memory read primitives.\nI:H - The bug is an out-of-bounds write into kernel heap metadata or adjacent objects beyond the allocated page_lcns[] array; per kernel guidance OOB writes enable controlled heap corruption paths toward arbitrary kernel writes and privilege escalation.\nA:H - KASAN reported slab-out-of-bounds write from log_replay() on mount; heap corruption during journal replay can cause immediate kernel oops/panic and is repeatable on each mount of a malicious NTFS volume, constituting high availability impact."
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      "title": "fs/ntfs3: bound copy_lcns dp-\u003epage_lcns[] index in analysis pass",
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    "cveId": "CVE-2026-72196",
    "datePublished": "2026-08-15T05:53:55.509Z",
    "dateReserved": "2026-08-09T03:40:39.911Z",
    "dateUpdated": "2026-08-17T05:41:23.012Z",
    "state": "PUBLISHED"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound copy_lcns dp-\u003epage_lcns[] index in analysis pass\n\nIn log_replay()\u0027s analysis pass, after find_dp() returns a\nvalid DIR_PAGE_ENTRY for the (target_attr, target_vcn) tuple,\nthe copy_lcns block walks lrh-\u003elcns_follow further entries:\n\n\tt16 = le16_to_cpu(lrh-\u003elcns_follow);\n\tfor (i = 0; i \u003c t16; i++) {\n\t    size_t j = (size_t)(le64_to_cpu(lrh-\u003etarget_vcn) -\n\t                        le64_to_cpu(dp-\u003evcn));\n\t    dp-\u003epage_lcns[j + i] = lrh-\u003epage_lcns[i];\n\t}\n\nfind_dp() only validates that target_vcn falls within\n[dp-\u003evcn, dp-\u003evcn + dp-\u003elcns_follow), i.e., that the FIRST\ncluster is covered.  The walk through the further entries is\nnot bounded against dp-\u003elcns_follow.  For a malformed LRH\nwhere target_vcn = dp-\u003evcn + dp-\u003elcns_follow - 1 and\nlrh-\u003elcns_follow \u003e 1, the i \u003e 0 writes overflow the dp\u0027s\nallocated page_lcns[] array.\n\nAdd the missing j + lrh-\u003elcns_follow \u003c= dp-\u003elcns_follow guard.\n\nReproduced under UML+KASAN on mainline 8d90b09e6741 as a\nslab-out-of-bounds write of size 8 from log_replay+0x68d4 on\nthe mount path.\n\nThis is distinct from Pavitra Jha\u0027s 2026-05-02 patch\n(\"fs/ntfs3: validate lcns_follow in log_replay conversion\",\n\u003c20260502154252.164586-1-jhapavitra98@gmail.com\u003e) which\naddresses the separate version-0 dirty-page-table conversion\npath\u0027s memmove(\u0026dp-\u003evcn, ...) call.  The two fixes are\ncomplementary; both should land.\n\n[almaz.alexandrovich@paragon-software.com: clang-formatted the changes,\nfixed conflicts]"
          }
        ],
        "id": "CVE-2026-72196",
        "lastModified": "2026-08-17T06:18:20.347",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 8.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.5,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-15T06:21:38.200",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
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          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T15:33:19+00:00",
      "cve": "CVE-2026-72196",
      "id": "CVE-2026-72196",
      "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 copy_lcns dp-\u003epage_lcns[] index in analysis pass",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72196.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T16:27:10Z",
      "cve": "CVE-2026-72196",
      "id": "CVE-2026-72196",
      "initial_release_date": "2026-08-31T16:27:10Z",
      "product_status:known_affected": "77",
      "product_status:known_not_affected": "285",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72196",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72196.json",
      "version": "2"
    }
  }
}



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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

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.