CVE-2026-45935
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
A vulnerability has been identified in the Linux kernel within the 'DeleteIndexEntryRoot' function that may lead to a heap buffer overflow. The issue arises from inadequate bounds checking when calculating the entry size, potentially resulting in out-of-bounds reads.
Risk Assessment
Exploitation of this vulnerability could lead to unauthorized memory access, threatening the integrity and confidentiality of data within the system. It may also allow attackers to execute malicious code.
Recommendation
It is recommended to update the Linux kernel to the latest version where fixes have been implemented to address this vulnerability. Additionally, systems should be monitored for unauthorized activities.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot In the 'DeleteIndexEntryRoot' case of the 'do_action' function, the entry size ('esize') is retrieved from the log record without adequate bounds checking. Specifically, the code calculates the end of the entry ('e2') using: e2 = Add2Ptr(e1, esize); It then calculates the size for memmove using 'PtrOffset(e2, ...)', which subtracts the end pointer from the buffer limit. If 'esize' is maliciously large, 'e2' exceeds the used buffer size. This results in a negative offset which, when cast to size_t for memmove, interprets as a massive unsigned integer, leading to a heap buffer overflow. This commit adds a check to ensure that the entry size ('esize') strictly fits within the remaining used space of the index header before performing memory operations.