CVE-2026-90133
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
In the Linux kernel, the ntfs_ir_to_ib() function contains a heap out-of-bounds write. It copies entries from index_root into a freshly allocated index_block_size-byte buffer without verifying that the entries fit in the available space. The lack of a bounds check before memcpy allows writes past the end of the allocation.
Risk Assessment
This vulnerability can lead to kernel memory corruption, system crash (panic), or potential kernel code execution. However, it requires mounting a crafted NTFS filesystem image, which is generally not part of the kernel threat model.
Recommendation
Update the Linux kernel to a version containing the fix for CVE-2026-90133. Avoid mounting untrusted NTFS filesystem images on critical systems.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ntfs: Fix index_root heap OOB write in ntfs_ir_to_ib() ntfs_ir_to_ib copies all entries from index_root into a freshly allocated index_block_size-byte buffer without verifying that the entries fit in the available space. The entries in index_root may be larger than the usable entry space in the index block. This can cause OOB writes past the end of the allocation. The validator ntfs_index_root_inconsistent() checks that entries are self-consistent within the IR value, but never cross-checks them against index_block_size. There is no bounds check in ntfs_ir_to_ib() before the memcpy. Fixing this at the sink in ntfs_ir_to_ib() since ntfs_index_root_inconsistent() validates the logical consistency of index_root as a structure and a root with large entries is a structurally valid root. The bug is a size conflict of ntfs_ir_to_ib(). Also, the validator is called once per inode load in ntfs_read_locked_inode() while ntfs_ir_to_ib() is only called during a reparent, a check there adds no overhead to the common path. Moreover, even a future call path that bypasses the validator would still be protected. With NULL as first parameter of ntfs_error(), the volume error flag is never set by this call, so the device name will be absent from the error message. In any case, that the caller, ntfs_ir_reparent(), prints an error message that includes the device name on NULL returns. I think this is the best solution available without adding 'struct super_block *sb' as a parameter to ntfs_ir_to_ib(). This heap out-of-bounds write is triggered by a crafted filesystem image, which is not in the kernel threat model, anyway, fixing memory errors would be nice to keep things secure.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS