CVE-2026-72194
Description
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: add depth limit to indx_find_buffer to prevent stack overflow indx_find_buffer() recursively descends the B+ tree index with no depth limit. A crafted NTFS image with circular index node references causes unbounded recursion, overflowing the kernel stack and panicking the system. This is reachable by mounting a malicious NTFS filesystem (e.g. from a USB drive via desktop automount) and deleting a file whose index entry triggers the rebalancing fallback path in indx_delete_entry(). Add a depth parameter and bail out with -EINVAL when it reaches the fnd->nodes array bound, matching the constraint already enforced by fnd_push() in indx_find(). The related function indx_find() was previously patched for a similar infinite-loop issue (commit 1732053c8a6b), but indx_find_buffer() was missed.
How to fix
- Linux Linux99031d4f63c785d2a985b6a4c64c4256f7117052, 65357a81f64cb3fbe13b4b937586755e4b3a072f, 96fb64f9da86fd2dbd78fbe9d9e41ae27e12ce34, 78612f478f9fadcec4f9b3b089970da67ffb47e9, 908c9243ba309997b73cbda3e4c563d0fb345ee9, fdf50c788e0991e42a187ff75479a0df7fb752f1, 1ebd684b8f627f75bc3e03f8b2ad8400fd1f02cd or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 82cae269cfa953032fbb8980a7d554d60fb00b17 ≤ v < 99031d4f63c785d2a985b6a4c64c4256f7117052, 82cae269cfa953032fbb8980a7d554d60fb00b17 ≤ v < 65357a81f64cb3fbe13b4b937586755e4b3a072f, 82cae269cfa953032fbb8980a7d554d60fb00b17 ≤ v < 96fb64f9da86fd2dbd78fbe9d9e41ae27e12ce34, 82cae269cfa953032fbb8980a7d554d60fb00b17 ≤ v < 78612f478f9fadcec4f9b3b089970da67ffb47e9, 82cae269cfa953032fbb8980a7d554d60fb00b17 ≤ v < 908c9243ba309997b73cbda3e4c563d0fb345ee9, 82cae269cfa953032fbb8980a7d554d60fb00b17 ≤ v < fdf50c788e0991e42a187ff75479a0df7fb752f1, 82cae269cfa953032fbb8980a7d554d60fb00b17 ≤ v < 1ebd684b8f627f75bc3e03f8b2ad8400fd1f02cd, 5.15 | 99031d4f63c785d2a985b6a4c64c4256f7117052, 65357a81f64cb3fbe13b4b937586755e4b3a072f, 96fb64f9da86fd2dbd78fbe9d9e41ae27e12ce34, 78612f478f9fadcec4f9b3b089970da67ffb47e9, 908c9243ba309997b73cbda3e4c563d0fb345ee9, fdf50c788e0991e42a187ff75479a0df7fb752f1, 1ebd684b8f627f75bc3e03f8b2ad8400fd1f02cd |
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