CVE-2026-31708

216.73.217.64

· Published 01/05/2026 14:16 · Modified 01/05/2026 15:24

Labels: CVE-2026-31708 2026-05-01 416baaa9-dc9f-4396-8d5f-8c081fb06d67 CVE-2026-31708

Essential information

Published: 01/05/2026 14:16
Modified: 01/05/2026 15:24
Author: —
Creator: —
CVSS: 8.1 HIGH (v3.1)
CISA KEV: No
CWE: CWE-125
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

CVSS metrics

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path smb2_ioctl_query_info() has two response-copy branches: PASSTHRU_FSCTL and the default QUERY_INFO path. The QUERY_INFO branch clamps qi.input_buffer_length to the server-reported OutputBufferLength and then copies qi.input_buffer_length bytes from qi_rsp->Buffer to userspace, but it never verifies that the flexible-array payload actually fits within rsp_iov[1].iov_len. A malicious server can return OutputBufferLength larger than the actual QUERY_INFO response, causing copy_to_user() to walk past the response buffer and expose adjacent kernel heap to userspace. Guard the QUERY_INFO copy with a bounds check on the actual Buffer payload. Use struct_size(qi_rsp, Buffer, qi.input_buffer_length) rather than an open-coded addition so the guard cannot overflow on 32-bit builds.

NVD status

Status: Modified — CVE has been recently published to the CVE List and has been received by the NVD.
Source: nist-nvd-api
NVD: View on NVD

Affected products (CPE)

Product	CPE
linux / linux kernel	`cpe:2.3:o:linux:linux_kernel::::::::`