CVE-2025-71266fs: ntfs3: check return value of indx_find to avoid infinite loop

Official description

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/14c3188afbedfd5178bbabb8002487ea14b37b56
• https://git.kernel.org/stable/c/435d34719db0e130f6f0c621d67ed524cc1a7d10
• https://git.kernel.org/stable/c/68e32694be231c1cdb99b7637a657314e88e1a96
• https://git.kernel.org/stable/c/398e768d1accd1f5645492ab996005d7aa84a5b0
• https://git.kernel.org/stable/c/b0ea441f44ce64fa514a415d4a9e6e2b06e7946c
• https://git.kernel.org/stable/c/0ad7a1be44479503dbe5c699759861ef5b8bd70c
• https://git.kernel.org/stable/c/1732053c8a6b360e2d5afb1b34fe9779398b072c
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html