CVE-2026-89612

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89612", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.734Z", "datePublished": "2026-09-11T19:45:13.415Z", "dateUpdated": "2026-10-19T08:49:44.526Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:49:44.526Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: reject invalid MFT LCNs from boot sector\n\nThe NTFS boot sector stores the MFT and MFTMirr locations as unsigned\n64-bit LCNs, but parse_ntfs_boot_sector() decoded them into an s64.\n\nA crafted high-bit value could therefore become negative and pass\nthe existing upper-bound check. The invalid value then propagated into\nthe MFT zone allocator and could result in an out-of-bounds access to\nlcn_empty_bits_per_page."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - After a crafted NTFS volume is mounted, fs/ntfs registers ntfs_export_ops, so nfsd/ksmbd VFS writes and creates reach ntfs_cluster_alloc() and index the poisoned MFT-zone LCN into lcn_empty_bits_per_page without local shell access.\nAC:L - The attacker fully controls the unsigned 64-bit MFT/MFTMirr LCNs in the boot sector; a high-bit value becomes a negative s64, bypasses the signed upper-bound check, and later allocator walks use that value as bmp_pos with no race or rare config.\nPR:N - Triggering the allocator needs only write access to a mounted NTFS export (guest/anonymous SMB or a permissive NFS export) or an unprivileged write on an already-mounted volume, not init-namespace root or CAP_SYS_ADMIN at trigger time.\nUI:N - After the crafted volume is mounted and exported, ordinary remote or local write/create operations invoke ntfs_cluster_alloc() with the poisoned mft_zone_pos; no extra victim mount dialog or USB insertion is required during the attack.\nS:U - Out-of-bounds access to vol->lcn_empty_bits_per_page corrupts kernel heap within the host OS security domain and does not cross a VM, container, or IOMMU boundary to another authority.\nC:H - ntfs_cluster_alloc() reads lcn_empty_bits_per_page[index] where index is derived from the attacker-chosen negative LCN (truncating to a controllable pgoff_t on 32-bit), an unbounded kernel heap out-of-bounds read that can disclose adjacent objects.\nI:H - The same attacker-influenced index is passed to ntfs_set_lcn_empty_bits(), which increments or decrements lcn_empty_bits_per_page[index], a kernel heap out-of-bounds write exploitable for arbitrary write and control-flow hijacking.\nA:H - The out-of-bounds lcn_empty_bits_per_page index causes a kernel oops or KASAN slab-out-of-bounds fault in ntfs_cluster_alloc()/ntfs_set_lcn_empty_bits(), crashing or hanging the host even when not fully exploited."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ntfs/super.c"], "versions": [{"version": "11ccc9107dc460de28af90fac1f42404d9802735", "lessThan": "8f8420b68a6f05ca2b03779d8208814ec539b9e5", "status": "affected", "versionType": "git"}, {"version": "11ccc9107dc460de28af90fac1f42404d9802735", "lessThan": "cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ntfs/super.c"], "versions": [{"version": "7.1", "status": "affected"}, {"version": "0", "lessThan": "7.1", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8f8420b68a6f05ca2b03779d8208814ec539b9e5"}, {"url": "https://git.kernel.org/stable/c/cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2"}], "title": "ntfs: reject invalid MFT LCNs from boot sector", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ntfs/super.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8f8420b68a6f05ca2b03779d8208814ec539b9e5", "status": "affected", "version": "11ccc9107dc460de28af90fac1f42404d9802735", "versionType": "git"}, {"lessThan": "cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2", "status": "affected", "version": "11ccc9107dc460de28af90fac1f42404d9802735", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ntfs/super.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.1"}, {"lessThan": "7.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: reject invalid MFT LCNs from boot sector\n\nThe NTFS boot sector stores the MFT and MFTMirr locations as unsigned\n64-bit LCNs, but parse_ntfs_boot_sector() decoded them into an s64.\n\nA crafted high-bit value could therefore become negative and pass\nthe existing upper-bound check. The invalid value then propagated into\nthe MFT zone allocator and could result in an out-of-bounds access to\nlcn_empty_bits_per_page."}], "id": "CVE-2026-89612", "lastModified": "2026-10-19T09:17:57.843", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:19:46.313", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8f8420b68a6f05ca2b03779d8208814ec539b9e5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Out-of-bounds memory access in NTFS via crafted boot sector", "id": "2532112", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532112"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in the Linux kernel's NTFS filesystem driver. A local attacker could provide a specially crafted NTFS boot sector containing an invalid Master File Table (MFT) Logical Cluster Number (LCN). Due to an integer overflow during parsing, this could lead to an out-of-bounds memory access. This vulnerability may result in system instability or a denial of service."], "name": "CVE-2026-89612", "public_date": "2026-09-11T19:45:13Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89612\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89612\nhttps://git.kernel.org/stable/c/8f8420b68a6f05ca2b03779d8208814ec539b9e5\nhttps://git.kernel.org/stable/c/cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[11ccc9107dc460de28af90fac1f42404d9802735,8f8420b68a6f05ca2b03779d8208814ec539b9e5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[11ccc9107dc460de28af90fac1f42404d9802735,cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,7.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T06:45:10.801554+00:00", "updated": "2026-09-15T21:30:16.429603+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}