CVE-2026-31478Disclosure(linux / linux_kernel)

LOWCVSS 9.8 · CRITICAL

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Patch linux linux_kernel systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD 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.

0.5/ 10 priority

Sources & remediation

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • linux_kernel

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 2 total mentions across 1 day

Affected systems

Vendors
Products
linux_kernel

2 versions affected across 1 product

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-04-22: 2Patch / Workaround · 2026-04-22: 1Technical Details · 2026-04-22: 104-22
Signal classification2 categories
Disclosure
150.0%
Patch
150.0%
Referenced assets2 URLs
By indicator
Full discourse2 posts
  • CVE@CVEnew
    Patch

    CVE-2026-31478 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 comm… https://www.cve.org/CVERecord?id=CVE-2026-31478

    Post summary

    The post announces that CVE-2026-31478 in the Linux kernel has been fixed by replacing a hard‑coded value with an offset, indicating a vendor patch was applied.

    00000143
    57.2K followersView on X
  • VulDB 🛡@vuldb
    Disclosure

    The severity is increased for this new vulnerability affecting Linux Kernel (CVE-2026-31478) https://vuldb.com/vuln/358889

    Post summary

    The post announces that the severity of a newly disclosed Linux Kernel CVE has been increased, but no technical details, PoC, or exploitation evidence are provided.

    0000064
    2.1K followersView on X
CPE platform detail9 entries

9 of 9 entries

PartVendorProductVersionTarget SWTarget HW
OSlinuxlinux_kernel---
OSlinuxlinux_kernel6.6--
OSlinuxlinux_kernel7.0--
OSlinuxlinux_kernel7.0--
OSlinuxlinux_kernel7.0--
OSlinuxlinux_kernel7.0--
OSlinuxlinux_kernel7.0--
OSlinuxlinux_kernel7.0--
OSlinuxlinux_kernel7.0--

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