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VulnerabilityPublished Updated

CVE-2026-43141: Linux kernel · ntb: ntb_hw_switchtec: Fix shift-out-of-bounds for 0 mw lut

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 11 Nov 2026, 22:48 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

What to do

AI-suggested

A patch has been applied to the Linux kernel to fix this issue by validating the input to rounddown_pow_of_two. Users should update to the fixed kernel version once available. Patch status is not explicitly confirmed; check the vendor advisory for current remediation guidance.

Description

A vulnerability in the Linux kernel's ntb_hw_switchtec driver was fixed to prevent a shift-out-of-bounds error when the number of memory window lookup tables (MW LUTs) is zero. The issue arises because the function rounddown_pow_of_two was called with zero, leading to undefined behavior. The patch ensures this function is only called with valid values.

References

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