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CVE-2026-31405

Critical Vulnerability: CVE-2026-31405 — linux — linux_kernel

In the Linux kernel, the following vulnerability has been resolved: media: dvb-net: fix OOB access in ULE extension header tables The ule_mandatory_ext_handlers[] and ule_optional_ext_handlers[] tables in handle_one_ule_extension() are declared with 255 elements (valid indices 0-254), but the index htype is derived from network-controlled data as (ule_sndu_type & 0x00FF), giving a range of 0-255. When htype equals 255, an out-of-bounds read occurs on the function pointer table, and the OOB val

Wednesday, May 20, 2026linuxVulnios Threat Intelligence
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Vulnerability Snapshot

CVE-2026-31405 is rated CRITICAL — exploitation is trivial or already observed in the wild and impact is severe. Patch immediately, not on the next maintenance window.

Affected technology: linux_kernel.

Executive Summary

In the Linux kernel, the following vulnerability has been resolved:

media: dvb-net: fix OOB access in ULE extension header tables

The ule_mandatory_ext_handlers[] and ule_optional_ext_handlers[] tables

in handle_one_ule_extension() are declared with 255 elements (valid

indices 0-254), but the index htype is derived from network-controlled

data as (ule_sndu_type & 0x00FF), giving a range of 0-255. When

htype equals 255, an out-of-bounds read occurs on the function pointer

table, and the OOB value may be called as a function pointer.

Add a bounds check on htype against the array size before either table

is accessed. Out-of-range values now cause the SNDU to be discarded.

Why It Matters

CVE-2026-31405 is rated CRITICAL severity, requiring immediate attention from security teams.

CVSS Base Score: 9.8/10

EPSS (Exploit Prediction): 0.0% probability of exploitation in the next 30 days.

Affected Technologies

Vendors: linux

Products: linux_kernel

🛡️What Defenders Should Check

  • Check if you are affected — Review your asset inventory for products listed in CVE-2026-31405.
  • Apply available patches — Visit vendor advisories for the latest security updates.
  • Monitor for exploitation — Check your SIEM/IDS logs for related indicators.

    • Use Vulnios to continuously monitor your exposure to CVE-2026-31405 and similar vulnerabilities.

    References & Sources

  • https://git.kernel.org/stable/c/145e50c2c700fa52b840df7bab206043997dd18e
  • https://git.kernel.org/stable/c/1a6da3dbb9985d00743073a1cc1f96e59f5abc30
  • https://git.kernel.org/stable/c/24d87712727a5017ad142d63940589a36cd25647
  • https://git.kernel.org/stable/c/29ef43ceb121d67b87f4cbb08439e4e9e732eff8
  • https://git.kernel.org/stable/c/8bde543d2a5f935ba2a6a6325a2e02f8a9256fbe
  • https://git.kernel.org/stable/c/b2bd2ee73b697c177157bba534e1b1064c2e66a0
  • https://git.kernel.org/stable/c/e51238718217c4abdb3ccc3b0c0cde265c7ec629
  • https://git.kernel.org/stable/c/f2b65dcb78c8990e4c68a906627433be1fe38a92

    • How Vulnios Detects This

    Vulnios scans for this vulnerability using Trivy and Grype for CVE matching against your container images and OS package manifests. Run a scan against your environment to see whether you are exposed; findings are linked back to the original CVE record so triage starts with the patch path already known.

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    Affected Products

    linux_kernel

    Sources

    Related Threat Alerts

    Frequently Asked Questions

    What is CVE-2026-31405?

    CVE-2026-31405 is a critical-severity vulnerability tracked under the Common Vulnerabilities and Exposures program. In the Linux kernel, the following vulnerability has been resolved:

    media: dvb-net: fix OOB access in ULE extension header tables

    The ule_mandatory_ext_handlers[] and ule_optional_ext_handlers[] tab

    Am I affected?

    Check whether your environment runs linux_kernel. If you operate any of those, treat yourself as in scope until you have evidence otherwise. A Vulnios scan will identify the exact assets carrying the affected version.

    How urgent is the response?

    Critical: do not wait for your normal patch cycle. Verify exposure today, apply the vendor patch immediately, and add detection rules for any post-exploit indicators.

    How do I remediate?

    Apply the vendor patch listed in the upstream advisory linked under Sources. If the patch is not yet available, follow the vendor-supplied workaround (often a config flag or feature disable) and add detections for the published exploit pattern in your SIEM. Re-scan after the patch lands to confirm the finding clears.

    Where can I track exploitation activity?

    Watch CISA's Known Exploited Vulnerabilities catalog for CVE-2026-31405. Cross-reference with public exploit databases and your own SIEM/IDS for indicator-of-compromise patterns. Vulnios tracks KEV status automatically and surfaces it on the asset findings view.

    How does Vulnios help with this?

    Vulnios continuously cross-references your asset inventory against the live CVE feed (NVD, vendor advisories, CISA KEV, and curated OSINT). When a new CVE matches your environment, you get a prioritized finding with the severity, KEV status, exploit-prediction (EPSS), and a direct path to the vendor patch. You can start a free scan from the homepage.

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