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Vulnerabilities

Vulnerability · CVE-2025-40236

In the Linux kernel, the following vulnerability has been resolved: virtio-net: zero unused hash fields When GSO tunnel is negotiated virtio_net_hdr_tnl_from_skb() tries to initial

Published Dec 4, 2025 · catalog updated May 11, 2026 · Linux Linux

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-40236. EPSS is 0.18%. Act only if a listed version of Linux Linux is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
None0.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.18%
Remediation
Version ranges on file
Affected products
vendor Linux Linux a2fb4bc4e2a6a031683910d85b278c1d25ae5420 <b2284768c6b32aa224ca7d0ef0741beb434f03aa

In the Linux kernel, the following vulnerability has been resolved: virtio-net: zero unused hash fields When GSO tunnel is negotiated virtio_net_hdr_tnl_from_skb() tries to initialize the tunnel metadata but forget to zero unused rxhash fields. This may leak information to another side. Fixing this by zeroing the unused hash fields.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Linux Linux a2fb4bc4e2a6a031683910d85b278c1d25ae5420 <b2284768c6b32aa224ca7d0ef0741beb434f03aaa2fb4bc4e2a6a031683910d85b278c1d25ae5420 <b2284768c6b32aa224ca7d0ef0741beb434f03aa

How to fix CVE-2025-40236

  • Upgrade

    CVE-2025-40236 lists a fix boundary at b2284768c6b32aa224ca7d0ef0741beb434f03aa. Compare the installed build with that boundary before you change production.

  • Version check

    Seen in a2fb4bc4e2a6a031683910d85b278c1d25ae5420 <b2284768c6b32aa224ca7d0ef0741beb434f03aa

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-40236. EPSS is 0.18%. Act only if a listed version of Linux Linux is installed.

Which versions are affected?

Compare what you have installed with Linux Linux a2fb4bc4e2a6a031683910d85b278c1d25ae5420 <b2284768c6b32aa224ca7d0ef0741beb434f03aa a2fb4bc4e2a6a031683910d85b278c1d25ae5420 <b2284768c6b32aa224ca7d0ef0741beb434f03aa. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.18%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 4, 2025 · EUVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: virtio-net: zero unused hash fields When GSO tunnel is negotiated virtio_net_hdr_tnl_from_skb() tries to initialize the tunnel metadata but forget to zero unused rxhash fields. This may leak information to another side. Fixing this by zeroing the unused hash fields.

  2. May 11, 2026 · EUVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: virtio-net: zero unused hash fields When GSO tunnel is negotiated virtio_net_hdr_tnl_from_skb() tries to initialize the tunnel metadata but forget to zero unused rxhash fields. This may leak information to another side. Fixing this by zeroing the unused hash fields.

Sources

  • CVE.orgVulnerability recordCVE-2025-40236

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-40236

    30-day exploitation probability 0.18%

    first.org
  • EUVDVulnerability recordEUVD-2025-201223

    In the Linux kernel, the following vulnerability has been resolved: virtio-net: zero unused hash fields When GSO tunnel is negotiated virtio_net_hdr_tnl_from_skb() tries to initialize the tunnel metadata but forget to zero unused rxhash fields. This may leak information to anothe

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 2, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 2, 2026
  • CVE.orgOct 26, 2026
  • EUVDOct 26, 2026