CVE-2026-31432

HIGH EPSS 39.4%
Published Apr 22, 20262mo ago · Modified Jun 17, 20261w ago
8.8 CVSS 3.1
High
Find Similar
Published Apr 22, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix OOB write in QUERY_INFO for compound requests When a compound request such as READ + QUERY_INFO(Security) is received, and the first command (READ) consumes most of the response buffer, ksmbd could write beyond the allocated buffer while building a security descriptor. The root cause was that smb2_get_info_sec() checked buffer space using ppntsd_size from xattr, while build_sec_desc() often synthesized a significantly larger descriptor from POSIX ACLs. This patch introduces smb_acl_sec_desc_scratch_len() to accurately compute the final descriptor size beforehand, performs proper buffer checking with smb2_calc_max_out_buf_len(), and uses exact-sized allocation + iov pinning.

CVSS Details

Base Score
8.8
Exploitability
2.8
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
39.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥5.15.145  –  <5.16
linuxlinux_kernel*≥6.1.71  –  <6.2
linuxlinux_kernel*≥6.6  –  <6.12.81
linuxlinux_kernel*≥6.13  –  <6.18.22
linuxlinux_kernel*≥6.19  –  <6.19.12
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/075ea208c648cc2bcd616295b711d3637c61de45
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/515c2daab46021221bdf406bef19bc90a44ec617
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d48c64fb80ad78b3dd29fb7d79b6ec7bd72bfc09
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fda9522ed6afaec45cabc198d8492270c394c7bc
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/075ea208c648cc2bcd616295b711d3637c61de45
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/515c2daab46021221bdf406bef19bc90a44ec617
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d48c64fb80ad78b3dd29fb7d79b6ec7bd72bfc09
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fda9522ed6afaec45cabc198d8492270c394c7bc
    Patch