CVE-2026-31411Public exploit

System crash via unvalidated ATM VCC pointer

Published Apr 8, 2026 · Updated Apr 8, 2026

A pointer dereference in the Linux kernel ATM send path allows local users to crash the system with a crafted signaling message. The sigd_send() path trusts msg->vcc from sendmsg() and dereferences an arbitrary address instead of confirming that it refers to a live VCC. Exploitation requires CAP_NET_ADMIN, control of the ATM signaling-daemon role, and a kernel built with CONFIG_ATM; successful triggering causes a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A pointer dereference in the Linux kernel ATM send path allows local users to crash the system with a crafted signaling message. The sigd_send() path trusts msg->vcc from sendmsg() and dereferences an arbitrary address instead of confirming that it refers to a live VCC. Exploitation requires CAP_NET_ADMIN, control of the ATM signaling-daemon role, and a kernel built with CONFIG_ATM; successful triggering causes a kernel crash.

The record

CVE
CVE-2026-31411
Published
Apr 8, 2026
Updated
Apr 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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 <1c8bda3df028d5e54134077dcd09f46ca8cfceb5
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <21c303fec138c002f90ed33bce60e807d53072bb
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3e1a8b00095246a9a2b46b57f6d471c6d3c00ed2
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <440c9a5fc477a8ee259d8bf669531250b8398651
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <69d3f9ee5489e6e8b66defcfa226e91d82393297
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ae88a5d2f29b69819dc7b04086734439d074a643
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c96549d07dfdd51aadf0722cfb40711574424840
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e3f80666c2739296c3b69a127300455c43aa1067
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1c8bda3df028d5e54134077dcd09f46ca8cfceb5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <21c303fec138c002f90ed33bce60e807d53072bb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3e1a8b00095246a9a2b46b57f6d471c6d3c00ed2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <440c9a5fc477a8ee259d8bf669531250b8398651; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <69d3f9ee5489e6e8b66defcfa226e91d82393297; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ae88a5d2f29b69819dc7b04086734439d074a643; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c96549d07dfdd51aadf0722cfb40711574424840; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e3f80666c2739296c3b69a127300455c43aa1067; version=2.6.12

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

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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