CVE-2026-72191

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72191", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.911Z", "datePublished": "2026-08-15T05:53:51.893Z", "dateUpdated": "2026-10-16T18:45:00.783Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:47:01.444Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: validate split-point offset in indx_insert_into_buffer\n\nindx_insert_into_buffer() computes\n\n used = used1 - to_copy - sp_size;\n memmove(de_t, Add2Ptr(sp, sp_size), used - le32_to_cpu(hdr1->de_off));\n\nwhere sp and sp_size come from hdr_find_split(). hdr_find_split()\nwalks entries by le16_to_cpu(e->size) without validating that each\nstep stays within hdr->used or that the size field is at least\nsizeof(struct NTFS_DE). index_hdr_check(), the on-load gatekeeper,\nonly validates header-level fields (used, total, de_off) and does\nnot walk per-entry sizes.\n\nA crafted NTFS image whose leaf INDEX_HDR reports used == total but\ncontains one interior NTFS_DE with size = 0xFFF0 therefore passes\nvalidation, descends to indx_insert_into_buffer() through the\nntfs_create() -> indx_insert_entry() path, and makes hdr_find_split()\nreturn an sp whose sp_size (0xFFF0) greatly exceeds the remaining\nbytes in the buffer. The u32 subtraction underflows and the memmove\ncount becomes a near-4-GiB value, producing an out-of-bounds kernel\nwrite that corrupts adjacent allocations and panics the kernel.\n\nReproduced on 7.0.0-rc7 with UML + KASAN via a crafted image and a\nsingle 'touch' inside the mounted directory; crash site resolves to\nfs/ntfs3/index.c at the memmove. Trigger requires only local mount\nof an attacker-supplied filesystem image (USB, loopback, or removable\nmedia auto-mount).\n\nReject the split whenever the chosen sp plus its declared size\nalready extends past hdr1->used. This is the minimal fix; it\npreserves the existing hdr_find_split() contract and relies on the\nsame out: cleanup path as the pre-existing error returns.\n\nA prior OOB read in the very same indx_insert_into_buffer() memmove\nwas fixed in commit b8c44949044e (\"fs/ntfs3: Fix OOB read in\nindx_insert_into_buffer\") by tightening hdr_find_e(), but that fix\ndoes not cover the split-point size field path addressed here: sp is\nreturned by hdr_find_split(), not hdr_find_e(), and the underflow is\ndriven by sp->size rather than hdr->used exceeding hdr->total."}], "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 - Remote SMB CREATE via ksmbd vfs_create on an ntfs3-exported share reaches ntfs_create_inode\u2192indx_insert_entry\u2192indx_insert_into_buffer; the same memmove path is also reachable locally via open(O_CREAT)/touch on a mounted crafted image.\nAC:L - The attacker fully controls the on-disk leaf INDEX_HDR and NTFS_DE size (e.g. 0xFFF0); once the buffer is full and a create forces a split, hdr_find_split() deterministically selects the bad entry and the u32 underflow yields a reliable near-4GiB OOB memmove with no race.\nPR:N - Exploitation requires only a crafted NTFS image and a create in the malicious directory\u2014no root on the target\u2014via udisks2/systemd automount of attacker USB media, or a remote ksmbd client with guest/anonymous write access to an already-mounted ntfs3 export.\nUI:N - After the crafted volume is mounted (automounter or admin), a single attacker-initiated touch/create or remote SMB CREATE in the prepared full directory triggers the split and OOB memmove without any further victim clicks, prompts, or confirmation.\nS:U - The OOB memmove corrupts kernel heap memory within the same host OS security domain as ntfs3; it can enable local privilege escalation but does not cross a VM/hypervisor, IOMMU, or container sandbox boundary.\nC:H - The underflowed memmove length reads far beyond the kmalloc'd index buffer from attacker-controlled on-disk bytes, giving a large out-of-bounds kernel heap read and disclosure/corruption primitive in addition to the write side.\nI:H - The same memmove performs a massive out-of-bounds kernel heap write of adjacent slab objects with attacker-influenced source data, enabling arbitrary memory corruption and potential control-flow hijack beyond a simple denial of service.\nA:H - Reproduced on 7.0.0-rc7 with KASAN: the oversized memmove corrupts adjacent allocations and panics the kernel at fs/ntfs3/index.c; even failed exploitation attempts typically cause oops or hard lockup from the unbounded copy."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ntfs3/index.c"], "versions": [{"version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "8e4ba5a38c155bb3c1c11e63cd285b178cdb099e", "status": "affected", "versionType": "git"}, {"version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "4c2f648139a0a86f4486170f72e24fedd4fae74e", "status": "affected", "versionType": "git"}, {"version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "b232eb5c9fe11ec2368e9b565db69c724c35fbd2", "status": "affected", "versionType": "git"}, {"version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "7bf74e6baf810fe325f111996496c678fc6e244f", "status": "affected", "versionType": "git"}, {"version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "f3624cc069195001c88df7a291af215f2133ff2c", "status": "affected", "versionType": "git"}, {"version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "1758a564b6ebe7f4a82f23c9851d1cae15549457", "status": "affected", "versionType": "git"}, {"version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "f1df9d771df47aa40de6d70949c28720ae1e430d", "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/ntfs3/index.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.217", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.184", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.15", "versionEndExcluding": "5.15.217"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.184"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8e4ba5a38c155bb3c1c11e63cd285b178cdb099e"}, {"url": "https://git.kernel.org/stable/c/4c2f648139a0a86f4486170f72e24fedd4fae74e"}, {"url": "https://git.kernel.org/stable/c/b232eb5c9fe11ec2368e9b565db69c724c35fbd2"}, {"url": "https://git.kernel.org/stable/c/7bf74e6baf810fe325f111996496c678fc6e244f"}, {"url": "https://git.kernel.org/stable/c/f3624cc069195001c88df7a291af215f2133ff2c"}, {"url": "https://git.kernel.org/stable/c/1758a564b6ebe7f4a82f23c9851d1cae15549457"}, {"url": "https://git.kernel.org/stable/c/f1df9d771df47aa40de6d70949c28720ae1e430d"}], "title": "ntfs3: validate split-point offset in indx_insert_into_buffer", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72191", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:43:30.355468Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:45:00.783Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72191", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:43:30.355468Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:43:30.896Z"}}], "cna": {"title": "ntfs3: validate split-point offset in indx_insert_into_buffer", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 9.8, "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - Remote SMB CREATE via ksmbd vfs_create on an ntfs3-exported share reaches ntfs_create_inode\u2192indx_insert_entry\u2192indx_insert_into_buffer; the same memmove path is also reachable locally via open(O_CREAT)/touch on a mounted crafted image.\nAC:L - The attacker fully controls the on-disk leaf INDEX_HDR and NTFS_DE size (e.g. 0xFFF0); once the buffer is full and a create forces a split, hdr_find_split() deterministically selects the bad entry and the u32 underflow yields a reliable near-4GiB OOB memmove with no race.\nPR:N - Exploitation requires only a crafted NTFS image and a create in the malicious directory\u2014no root on the target\u2014via udisks2/systemd automount of attacker USB media, or a remote ksmbd client with guest/anonymous write access to an already-mounted ntfs3 export.\nUI:N - After the crafted volume is mounted (automounter or admin), a single attacker-initiated touch/create or remote SMB CREATE in the prepared full directory triggers the split and OOB memmove without any further victim clicks, prompts, or confirmation.\nS:U - The OOB memmove corrupts kernel heap memory within the same host OS security domain as ntfs3; it can enable local privilege escalation but does not cross a VM/hypervisor, IOMMU, or container sandbox boundary.\nC:H - The underflowed memmove length reads far beyond the kmalloc'd index buffer from attacker-controlled on-disk bytes, giving a large out-of-bounds kernel heap read and disclosure/corruption primitive in addition to the write side.\nI:H - The same memmove performs a massive out-of-bounds kernel heap write of adjacent slab objects with attacker-influenced source data, enabling arbitrary memory corruption and potential control-flow hijack beyond a simple denial of service.\nA:H - Reproduced on 7.0.0-rc7 with KASAN: the oversized memmove corrupts adjacent allocations and panics the kernel at fs/ntfs3/index.c; even failed exploitation attempts typically cause oops or hard lockup from the unbounded copy."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "8e4ba5a38c155bb3c1c11e63cd285b178cdb099e", "versionType": "git"}, {"status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "4c2f648139a0a86f4486170f72e24fedd4fae74e", "versionType": "git"}, {"status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "b232eb5c9fe11ec2368e9b565db69c724c35fbd2", "versionType": "git"}, {"status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "7bf74e6baf810fe325f111996496c678fc6e244f", "versionType": "git"}, {"status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "f3624cc069195001c88df7a291af215f2133ff2c", "versionType": "git"}, {"status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "1758a564b6ebe7f4a82f23c9851d1cae15549457", "versionType": "git"}, {"status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "f1df9d771df47aa40de6d70949c28720ae1e430d", "versionType": "git"}], "programFiles": ["fs/ntfs3/index.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"status": "unaffected", "version": "0", "lessThan": "5.15", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.217", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.184", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/ntfs3/index.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/8e4ba5a38c155bb3c1c11e63cd285b178cdb099e"}, {"url": "https://git.kernel.org/stable/c/4c2f648139a0a86f4486170f72e24fedd4fae74e"}, {"url": "https://git.kernel.org/stable/c/b232eb5c9fe11ec2368e9b565db69c724c35fbd2"}, {"url": "https://git.kernel.org/stable/c/7bf74e6baf810fe325f111996496c678fc6e244f"}, {"url": "https://git.kernel.org/stable/c/f3624cc069195001c88df7a291af215f2133ff2c"}, {"url": "https://git.kernel.org/stable/c/1758a564b6ebe7f4a82f23c9851d1cae15549457"}, {"url": "https://git.kernel.org/stable/c/f1df9d771df47aa40de6d70949c28720ae1e430d"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: validate split-point offset in indx_insert_into_buffer\n\nindx_insert_into_buffer() computes\n\n used = used1 - to_copy - sp_size;\n memmove(de_t, Add2Ptr(sp, sp_size), used - le32_to_cpu(hdr1->de_off));\n\nwhere sp and sp_size come from hdr_find_split(). hdr_find_split()\nwalks entries by le16_to_cpu(e->size) without validating that each\nstep stays within hdr->used or that the size field is at least\nsizeof(struct NTFS_DE). index_hdr_check(), the on-load gatekeeper,\nonly validates header-level fields (used, total, de_off) and does\nnot walk per-entry sizes.\n\nA crafted NTFS image whose leaf INDEX_HDR reports used == total but\ncontains one interior NTFS_DE with size = 0xFFF0 therefore passes\nvalidation, descends to indx_insert_into_buffer() through the\nntfs_create() -> indx_insert_entry() path, and makes hdr_find_split()\nreturn an sp whose sp_size (0xFFF0) greatly exceeds the remaining\nbytes in the buffer. The u32 subtraction underflows and the memmove\ncount becomes a near-4-GiB value, producing an out-of-bounds kernel\nwrite that corrupts adjacent allocations and panics the kernel.\n\nReproduced on 7.0.0-rc7 with UML + KASAN via a crafted image and a\nsingle 'touch' inside the mounted directory; crash site resolves to\nfs/ntfs3/index.c at the memmove. Trigger requires only local mount\nof an attacker-supplied filesystem image (USB, loopback, or removable\nmedia auto-mount).\n\nReject the split whenever the chosen sp plus its declared size\nalready extends past hdr1->used. This is the minimal fix; it\npreserves the existing hdr_find_split() contract and relies on the\nsame out: cleanup path as the pre-existing error returns.\n\nA prior OOB read in the very same indx_insert_into_buffer() memmove\nwas fixed in commit b8c44949044e (\"fs/ntfs3: Fix OOB read in\nindx_insert_into_buffer\") by tightening hdr_find_e(), but that fix\ndoes not cover the split-point size field path addressed here: sp is\nreturned by hdr_find_split(), not hdr_find_e(), and the underflow is\ndriven by sp->size rather than hdr->used exceeding hdr->total."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.217", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.184", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:47:01.444Z"}}}, "cveMetadata": {"cveId": "CVE-2026-72191", "state": "PUBLISHED", "dateUpdated": "2026-10-16T18:45:00.783Z", "dateReserved": "2026-08-09T03:40:39.911Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:53:51.893Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ntfs3/index.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8e4ba5a38c155bb3c1c11e63cd285b178cdb099e", "status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "versionType": "git"}, {"lessThan": "4c2f648139a0a86f4486170f72e24fedd4fae74e", "status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "versionType": "git"}, {"lessThan": "b232eb5c9fe11ec2368e9b565db69c724c35fbd2", "status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "versionType": "git"}, {"lessThan": "7bf74e6baf810fe325f111996496c678fc6e244f", "status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "versionType": "git"}, {"lessThan": "f3624cc069195001c88df7a291af215f2133ff2c", "status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "versionType": "git"}, {"lessThan": "1758a564b6ebe7f4a82f23c9851d1cae15549457", "status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "versionType": "git"}, {"lessThan": "f1df9d771df47aa40de6d70949c28720ae1e430d", "status": "affected", "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ntfs3/index.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"lessThan": "5.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.217", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.184", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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\nntfs3: validate split-point offset in indx_insert_into_buffer\n\nindx_insert_into_buffer() computes\n\n used = used1 - to_copy - sp_size;\n memmove(de_t, Add2Ptr(sp, sp_size), used - le32_to_cpu(hdr1->de_off));\n\nwhere sp and sp_size come from hdr_find_split(). hdr_find_split()\nwalks entries by le16_to_cpu(e->size) without validating that each\nstep stays within hdr->used or that the size field is at least\nsizeof(struct NTFS_DE). index_hdr_check(), the on-load gatekeeper,\nonly validates header-level fields (used, total, de_off) and does\nnot walk per-entry sizes.\n\nA crafted NTFS image whose leaf INDEX_HDR reports used == total but\ncontains one interior NTFS_DE with size = 0xFFF0 therefore passes\nvalidation, descends to indx_insert_into_buffer() through the\nntfs_create() -> indx_insert_entry() path, and makes hdr_find_split()\nreturn an sp whose sp_size (0xFFF0) greatly exceeds the remaining\nbytes in the buffer. The u32 subtraction underflows and the memmove\ncount becomes a near-4-GiB value, producing an out-of-bounds kernel\nwrite that corrupts adjacent allocations and panics the kernel.\n\nReproduced on 7.0.0-rc7 with UML + KASAN via a crafted image and a\nsingle 'touch' inside the mounted directory; crash site resolves to\nfs/ntfs3/index.c at the memmove. Trigger requires only local mount\nof an attacker-supplied filesystem image (USB, loopback, or removable\nmedia auto-mount).\n\nReject the split whenever the chosen sp plus its declared size\nalready extends past hdr1->used. This is the minimal fix; it\npreserves the existing hdr_find_split() contract and relies on the\nsame out: cleanup path as the pre-existing error returns.\n\nA prior OOB read in the very same indx_insert_into_buffer() memmove\nwas fixed in commit b8c44949044e (\"fs/ntfs3: Fix OOB read in\nindx_insert_into_buffer\") by tightening hdr_find_e(), but that fix\ndoes not cover the split-point size field path addressed here: sp is\nreturned by hdr_find_split(), not hdr_find_e(), and the underflow is\ndriven by sp->size rather than hdr->used exceeding hdr->total."}], "id": "CVE-2026-72191", "lastModified": "2026-10-16T19:17:13.480", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-72191", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:43:30.355468Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:21:37.537", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1758a564b6ebe7f4a82f23c9851d1cae15549457"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4c2f648139a0a86f4486170f72e24fedd4fae74e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7bf74e6baf810fe325f111996496c678fc6e244f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8e4ba5a38c155bb3c1c11e63cd285b178cdb099e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b232eb5c9fe11ec2368e9b565db69c724c35fbd2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f1df9d771df47aa40de6d70949c28720ae1e430d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f3624cc069195001c88df7a291af215f2133ff2c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ntfs3: validate split-point offset in indx_insert_into_buffer", "id": "2516357", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516357"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in the Linux kernel's ntfs3 driver. A local attacker can exploit this vulnerability by mounting a specially crafted NTFS filesystem image. This can lead to an integer underflow during a memory copy operation, resulting in an out-of-bounds kernel write. Successful exploitation causes a kernel panic, leading to a denial of service."], "name": "CVE-2026-72191", "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": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72191\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72191\nhttps://lore.kernel.org/linux-cve-announce/2026081541-CVE-2026-72191-b9e9@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[82cae269cfa953032fbb8980a7d554d60fb00b17,b232eb5c9fe11ec2368e9b565db69c724c35fbd2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[82cae269cfa953032fbb8980a7d554d60fb00b17,7bf74e6baf810fe325f111996496c678fc6e244f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[82cae269cfa953032fbb8980a7d554d60fb00b17,f3624cc069195001c88df7a291af215f2133ff2c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[82cae269cfa953032fbb8980a7d554d60fb00b17,1758a564b6ebe7f4a82f23c9851d1cae15549457)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[82cae269cfa953032fbb8980a7d554d60fb00b17,f1df9d771df47aa40de6d70949c28720ae1e430d)"}}], "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": "semver", "value": "5.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "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": "2026-08-15T16:45:10.667656+00:00", "updated": "2026-08-22T10:45:03.936958+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}