{"id":"DEBIAN-CVE-2026-72191","details":"In the Linux kernel, the following vulnerability has been resolved:  ntfs3: validate split-point offset in indx_insert_into_buffer  indx_insert_into_buffer() computes      used = used1 - to_copy - sp_size;     memmove(de_t, Add2Ptr(sp, sp_size), used - le32_to_cpu(hdr1-\u003ede_off));  where sp and sp_size come from hdr_find_split().  hdr_find_split() walks entries by le16_to_cpu(e-\u003esize) without validating that each step stays within hdr-\u003eused or that the size field is at least sizeof(struct NTFS_DE).  index_hdr_check(), the on-load gatekeeper, only validates header-level fields (used, total, de_off) and does not walk per-entry sizes.  A crafted NTFS image whose leaf INDEX_HDR reports used == total but contains one interior NTFS_DE with size = 0xFFF0 therefore passes validation, descends to indx_insert_into_buffer() through the ntfs_create() -\u003e indx_insert_entry() path, and makes hdr_find_split() return an sp whose sp_size (0xFFF0) greatly exceeds the remaining bytes in the buffer.  The u32 subtraction underflows and the memmove count becomes a near-4-GiB value, producing an out-of-bounds kernel write that corrupts adjacent allocations and panics the kernel.  Reproduced on 7.0.0-rc7 with UML + KASAN via a crafted image and a single 'touch' inside the mounted directory; crash site resolves to fs/ntfs3/index.c at the memmove.  Trigger requires only local mount of an attacker-supplied filesystem image (USB, loopback, or removable media auto-mount).  Reject the split whenever the chosen sp plus its declared size already extends past hdr1-\u003eused.  This is the minimal fix; it preserves the existing hdr_find_split() contract and relies on the same out: cleanup path as the pre-existing error returns.  A prior OOB read in the very same indx_insert_into_buffer() memmove was fixed in commit b8c44949044e (\"fs/ntfs3: Fix OOB read in indx_insert_into_buffer\") by tightening hdr_find_e(), but that fix does not cover the split-point size field path addressed here: sp is returned by hdr_find_split(), not hdr_find_e(), and the underflow is driven by sp-\u003esize rather than hdr-\u003eused exceeding hdr-\u003etotal.","modified":"2026-09-08T17:00:32.400287880Z","published":"2026-08-15T06:21:37.537Z","upstream":["CVE-2026-72191"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-72191"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.187-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.180-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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