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VulnerabilityPublished Updated

CVE-2025-38402: Linux kernel · idpf: return 0 size for RSS key if not supported

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f77bf1ebf8ff6301ccdbc346f7b52db928f9cbf8 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:20 UTC

Severity
Low

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

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch
Available – fixed in f77bf1ebf8ff6301ccdbc346f7b52db928f9cbf8, 326e384ee7acbebf0541ac064ac7a4dd1f1dde1d, 018ff57fd79c38be989b8b3248bbe69bcfb77160

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 25 Jul 2025

  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 5 Nov 2026.

What to do

Upgrade Linux kernel to f77bf1ebf8ff6301ccdbc346f7b52db928f9cbf8, 326e384ee7acbebf0541ac064ac7a4dd1f1dde1d or 018ff57fd79c38be989b8b3248bbe69bcfb77160.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 02cbfba1add5bd9088c7d14c6b93b77a6ea8f3bb, < f77bf1ebf8ff6301ccdbc346f7b52db928f9cbf8
Fixed in
  • f77bf1ebf8ff6301ccdbc346f7b52db928f9cbf8
LinuxLinuxAffected
  • ≥ 02cbfba1add5bd9088c7d14c6b93b77a6ea8f3bb, < 326e384ee7acbebf0541ac064ac7a4dd1f1dde1d
Fixed in
  • 326e384ee7acbebf0541ac064ac7a4dd1f1dde1d
LinuxLinuxAffected
  • ≥ 02cbfba1add5bd9088c7d14c6b93b77a6ea8f3bb, < 018ff57fd79c38be989b8b3248bbe69bcfb77160
Fixed in
  • 018ff57fd79c38be989b8b3248bbe69bcfb77160
LinuxLinuxAffected
  • =6.7
Fixed in–

AI-suggested

This vulnerability has been fixed in the Linux kernel in the commits identified by hashes f77bf1ebf8ff6301ccdbc346f7b52db928f9cbf8, 326e384ee7acbebf0541ac064ac7a4dd1f1dde1d, and 018ff57fd79c38be989b8b3248bbe69bcfb77160. Users should update their Linux kernel to a version including these fixes. No other mitigation or workaround is indicated.

Description

A vulnerability in the Linux kernel's idpf driver caused the function responsible for returning the RSS key size to return an invalid negative error code (-EOPNOTSUPP) cast as an unsigned 32-bit integer, leading to an invalid size value. This can cause allocation failures when the RSS key is not supported on a device. The issue has been fixed in specific commits.

References

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