CVE-2026-45935

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If 'esize' is\nmaliciously large, 'e2' exceeds the used buffer size. This results in\na negative offset which, when cast to size_t for memmove, interprets\nas a massive unsigned integer, leading to a heap buffer overflow.\n\nThis commit adds a check to ensure that the entry size ('esize') strictly\nfits within the remaining used space of the index header before performing\nmemory operations."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is reached only during NTFS journal ($LogFile) replay at mount time of a block-device filesystem; exploitation requires a locally-presented crafted NTFS image/device, not network access.\nAC:L - The attacker fully controls the on-disk $LogFile contents including the unbounded entry size; once the crafted image is mounted the overflow triggers deterministically with no race or uncontrolled condition.\nPR:N - The attacker only needs to craft the malicious filesystem image and requires no privileges on the target; this matches the established scoring for ntfs3 crafted-image parsing bugs (e.g., CVE-2026-46062).\nUI:R - A victim must mount the attacker-supplied crafted NTFS filesystem image for the journal replay to run, consistent with the directly analogous ntfs3 mount-time CVE-2026-46062.\nS:U - The out-of-bounds access is confined to kernel heap memory within the same kernel security authority; there is no crossing of a VM, sandbox, or IOMMU boundary.\nC:H - The memmove uses an attacker-influenced, effectively unbounded length, producing a large out-of-bounds read of adjacent slab/heap memory rather than a few-byte bounded read.\nI:H - The same memmove writes the enormous length starting at e1, overflowing the slab buffer into adjacent heap objects \u2014 an out-of-bounds write causing memory corruption.\nA:H - The catastrophic memmove of a near-SIZE_MAX length faults on unmapped memory, reliably causing a kernel 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{}

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If 'esize' is\nmaliciously large, 'e2' exceeds the used buffer size. This results in\na negative offset which, when cast to size_t for memmove, interprets\nas a massive unsigned integer, leading to a heap buffer overflow.\n\nThis commit adds a check to ensure that the entry size ('esize') strictly\nfits within the remaining used space of the index header before performing\nmemory operations."}], "id": "CVE-2026-45935", "lastModified": "2026-06-24T17:10:55.583", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-27T14:17:09.613", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/36c03f7f177b34d51f1cf1d2304b1074607bf4b0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/78942172d5bff4d4afed8674abc09cc560ce44a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a584b9d1059b29e97e17c919274e9adfb846f2a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b271c9cb85927210b1b799e55ee7f702d12b4336"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b2bc7c44ed1779fc9eaab9a186db0f0d01439622"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c065541b71b79874c83d418a9acd18ad5826339b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f3b437a4c3e022a1449658ae9f3dd34859894513"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot", "id": "2481961", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481961"}, "csaw": false, "cwe": "CWE-805", "details": ["A flaw was found in the Linux kernel's NTFS3 filesystem driver. Insufficient bounds checking when processing log records in the `DeleteIndexEntryRoot` function allows a local attacker to provide a maliciously large entry size. This can lead to a heap buffer overflow, a type of memory corruption, which may result in a denial of service or potentially arbitrary code execution."], "name": "CVE-2026-45935", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-45935\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-45935\nhttps://lore.kernel.org/linux-cve-announce/2026052727-CVE-2026-45935-aea5@gregkh/T"]}

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