CVE-2026-31405Network attack vector

Kernel compromise via ULE function-pointer table overread

Published Apr 6, 2026 · Updated Apr 6, 2026

Out-of-bounds access in the Linux Kernel DVB network path allows remote attackers to invoke an invalid function pointer via malformed ULE SNDUs. handle_one_ule_extension() uses the network-derived low byte of ule_sndu_type to index two 255-entry handler tables without rejecting the possible value 255. Exposure requires the DVB network ULE receive path; the invalid kernel control transfer can crash the system or execute code with kernel privileges.

CVSS severity9.8
Critical
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in the Linux Kernel DVB network path allows remote attackers to invoke an invalid function pointer via malformed ULE SNDUs. handle_one_ule_extension() uses the network-derived low byte of ule_sndu_type to index two 255-entry handler tables without rejecting the possible value 255. Exposure requires the DVB network ULE receive path; the invalid kernel control transfer can crash the system or execute code with kernel privileges.

The record

CVE
CVE-2026-31405
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <145e50c2c700fa52b840df7bab206043997dd18e
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1a6da3dbb9985d00743073a1cc1f96e59f5abc30
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <24d87712727a5017ad142d63940589a36cd25647
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <29ef43ceb121d67b87f4cbb08439e4e9e732eff8
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8bde543d2a5f935ba2a6a6325a2e02f8a9256fbe
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f2b65dcb78c8990e4c68a906627433be1fe38a92
  7. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <145e50c2c700fa52b840df7bab206043997dd18e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1a6da3dbb9985d00743073a1cc1f96e59f5abc30; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <24d87712727a5017ad142d63940589a36cd25647; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <29ef43ceb121d67b87f4cbb08439e4e9e732eff8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8bde543d2a5f935ba2a6a6325a2e02f8a9256fbe; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f2b65dcb78c8990e4c68a906627433be1fe38a92; version=2.6.12

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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