CVE-2025-38402: Linux kernel · idpf: return 0 size for RSS key if not supported
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f77bf1ebf8ff6301ccdbc346f7b52db928f9cbf8 : update Linux kernel when convenient.
Data as of 5 Nov 2026, 21:20 UTC
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
Disclosed: evidence found.
CVE published 25 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| 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.