{"id":"CVE-2026-72192","title":"ntfs3: bound to_move in indx_insert_into_root before hdr_insert_head","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: bound to_move in indx_insert_into_root before hdr_insert_head\n\nindx_insert_into_root() promotes a full resident $INDEX_ROOT into\n$INDEX_ALLOCATION and copies all…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < 0af83b8155cc848e9f5d2c36e20a70d024214649","Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < cb3161deebcaf8d36d3115abf452c633f2180fc1","Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < 53c5f3b2da3774b41534728aba295c098c9efa19","Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < 194b00c99ba971fa7cf6acd747a36032c6de54eb","Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < aaa1f956c0fc41089a4a534da7df91552a08a47c","Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < d240f5f9d036b8180224954d9873f172b6be4dd8","Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < 9b6926ac9c970ae0b2c2fe6289b16e9aa10b6a67","Linux 5.15"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T18:43:32.724211Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:45:00.935Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72192","references":[{"url":"https://git.kernel.org/stable/c/0af83b8155cc848e9f5d2c36e20a70d024214649"},{"url":"https://git.kernel.org/stable/c/cb3161deebcaf8d36d3115abf452c633f2180fc1"},{"url":"https://git.kernel.org/stable/c/53c5f3b2da3774b41534728aba295c098c9efa19"},{"url":"https://git.kernel.org/stable/c/194b00c99ba971fa7cf6acd747a36032c6de54eb"},{"url":"https://git.kernel.org/stable/c/aaa1f956c0fc41089a4a534da7df91552a08a47c"},{"url":"https://git.kernel.org/stable/c/d240f5f9d036b8180224954d9873f172b6be4dd8"},{"url":"https://git.kernel.org/stable/c/9b6926ac9c970ae0b2c2fe6289b16e9aa10b6a67"}],"tags":["cve.org"],"epss":0.00738,"epssPercentile":0.53608,"ingestedAt":"2026-10-16T19:46:24.423Z","slug":"CVE-2026-72192","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: bound to_move in indx_insert_into_root before hdr_insert_head\n\nindx_insert_into_root() promotes a full resident $INDEX_ROOT into\n$INDEX_ALLOCATION and copies all non-last resident root entries into\na newly allocated INDEX_BUFFER via hdr_insert_head(). The source\nbyte count 'to_move' is summed from the on-disk resident entry sizes\nand is independent of the destination buffer size, which comes from\nroot->index_block_size (via indx->index_bits).\n\nA crafted NTFS image that keeps a valid, full resident root but\nshrinks root->index_block_size down to 512 after the root has been\npopulated makes hdr_insert_head() memcpy attacker-controlled resident\nentry bytes past the end of the kmalloc(1u << indx->index_bits)\nallocation returned by indx_new(). For a 512-byte destination and a\nresident root whose non-last entries total 560 bytes, the memcpy\noverruns by 120 bytes and a following memmove extends the highest\nwritten offset to 136 bytes past the allocation. The overflow bytes\nare a direct copy of on-disk entries (via kmemdup), so they are\nfully attacker-controlled.\n\nThe write is reachable from unprivileged open(O_CREAT) on a mounted\ncrafted NTFS image: a single sufficiently long create in a directory\nwhose resident root is already full forces root promotion and\ntriggers the copy.\n\nThis is a controlled out-of-bounds write of 120-136 bytes past a\nkmalloc(index_block_size) allocation, with attacker-controlled\ncontent. It is a bounded adjacent-heap corruption primitive; it is\nnot an arbitrary-address write. Successful exploitation into a named\nvictim object depends on the surrounding slab layout.\n\nReject the copy at the sink. The destination's INDEX_HDR already\nreports hdr_total (the payload capacity of the new buffer) and\nhdr_used (the bytes already consumed by the terminal END entry\ninstalled by indx_new()); require that to_move fits in the remaining\npayload before calling hdr_insert_head(). On mismatch, fail with\n-EINVAL and mark the filesystem as having a detected on-disk\ninconsistency, which is the same behaviour as the surrounding\nvalidation in this function.\n\n## Affected\n\n- `Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < 0af83b8155cc848e9f5d2c36e20a70d024214649`\n- `Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < cb3161deebcaf8d36d3115abf452c633f2180fc1`\n- `Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < 53c5f3b2da3774b41534728aba295c098c9efa19`\n- `Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < 194b00c99ba971fa7cf6acd747a36032c6de54eb`\n- `Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < aaa1f956c0fc41089a4a534da7df91552a08a47c`\n- `Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < d240f5f9d036b8180224954d9873f172b6be4dd8`\n- `Linux >= 82cae269cfa953032fbb8980a7d554d60fb00b17 < 9b6926ac9c970ae0b2c2fe6289b16e9aa10b6a67`\n- `Linux 5.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}