CVE-2026-72310
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk48th percentile - higher than 48% of all known CVEs
Summary
In the Linux kernel SMB client, smb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload before copying it to userspace. The addition of OutputOffset and qi.input_buffer_length can wrap in 32-bit arithmetic, allowing a malicious server to bypass the bounds check and read outside the response buffer. The fix uses size_add() for safe addition.
Risk Assessment
A malicious server could exploit this vulnerability to read out-of-bounds data, potentially leading to information disclosure or system integrity compromise.
Recommendation
Apply the kernel patch that uses size_add() for bounds checking to prevent overflow.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix overflow in passthrough ioctl bounds check smb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload before copying it to userspace. The payload offset and length both come from 32-bit fields. The bounds check currently adds OutputOffset and qi.input_buffer_length directly, so the addition can wrap in 32-bit arithmetic before the result is compared against the response buffer length. A malicious server can use a large OutputOffset and a small OutputCount to make the wrapped sum pass the bounds check. The later copy_to_user() then reads from io_rsp + OutputOffset, outside the response buffer. Use size_add() for the offset plus length check so overflow is treated as out of bounds.