EUVD-2025-208819Lifecycle Timeline
4Description
In the Linux kernel, the following vulnerability has been resolved: fs: ntfs3: check return value of indx_find to avoid infinite loop We found an infinite loop bug in the ntfs3 file system that can lead to a Denial-of-Service (DoS) condition. A malformed dentry in the ntfs3 filesystem can cause the kernel to hang during the lookup operations. By setting the HAS_SUB_NODE flag in an INDEX_ENTRY within a directory's INDEX_ALLOCATION block and manipulating the VCN pointer, an attacker can cause the indx_find() function to repeatedly read the same block, allocating 4 KB of memory each time. The kernel lacks VCN loop detection and depth limits, causing memory exhaustion and an OOM crash. This patch adds a return value check for fnd_push() to prevent a memory exhaustion vulnerability caused by infinite loops. When the index exceeds the size of the fnd->nodes array, fnd_push() returns -EINVAL. The indx_find() function checks this return value and stops processing, preventing further memory allocation.
Analysis
An infinite loop vulnerability exists in the Linux kernel's ntfs3 filesystem implementation that allows attackers to trigger a denial-of-service condition through malformed NTFS directory entries. A crafted dentry with the HAS_SUB_NODE flag and manipulated VCN pointer can cause the indx_find() function to repeatedly allocate 4 KB memory blocks without proper loop detection, leading to memory exhaustion and kernel out-of-memory crashes. The vulnerability affects multiple stable Linux kernel versions across 5.15, 6.1, 6.6, 6.12, 6.18, and 6.19 series, and patches have been released for all affected branches.
Priority Score
Vendor Status
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bullseye | not-affected | - | - |
| bullseye (security) | fixed | 5.10.251-1 | - |
| bookworm | vulnerable | 6.1.159-1 | - |
| bookworm (security) | vulnerable | 6.1.164-1 | - |
| trixie | vulnerable | 6.12.73-1 | - |
| trixie (security) | vulnerable | 6.12.74-2 | - |
| forky | fixed | 6.19.6-2 | - |
| sid | fixed | 6.19.8-1 | - |
| (unstable) | fixed | 6.19.6-1 | - |
Share
External POC / Exploit Code
Leaving vuln.today