CVE-2026-31478

CRITICAL EPSS 39.1%
Published Apr 22, 20262mo ago · Modified Jun 17, 20261w ago
9.8 CVSS 3.1
Critical
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: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len() After this commit (e2b76ab8b5c9 "ksmbd: add support for read compound"), response buffer management was changed to use dynamic iov array. In the new design, smb2_calc_max_out_buf_len() expects the second argument (hdr2_len) to be the offset of ->Buffer field in the response structure, not a hardcoded magic number. Fix the remaining call sites to use the correct offsetof() value.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
39.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 14

VendorProductVersionRange
linuxlinux_kernel*≥5.15.145  –  <5.15.203
linuxlinux_kernel*≥6.1.71  –  <6.1.168
linuxlinux_kernel*≥6.6.1  –  <6.6.131
linuxlinux_kernel*≥6.7  –  <6.12.80
linuxlinux_kernel*≥6.13  –  <6.18.21
linuxlinux_kernel*≥6.19  –  <6.19.11
linuxlinux_kernel6.6any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 7

  • git.kernel.org https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683
    Patch