CVE-2026-31510

Local kernel panic via unchecked L2CAP socket pointer

Published Apr 22, 2026 · Updated Apr 22, 2026

NULL pointer dereference in Linux Kernel Bluetooth L2CAP allows local users to trigger a kernel panic through L2CAP connection handling. The l2cap_sock_ready_cb callback uses its sk pointer without first testing it for NULL, allowing timeout work to enter socket locking with an invalid pointer. Reachability requires low-privileged local access and Bluetooth L2CAP activity; successful triggering crashes the kernel without reported data exposure or modification.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux Kernel Bluetooth L2CAP allows local users to trigger a kernel panic through L2CAP connection handling. The l2cap_sock_ready_cb callback uses its sk pointer without first testing it for NULL, allowing timeout work to enter socket locking with an invalid pointer. Reachability requires low-privileged local access and Bluetooth L2CAP activity; successful triggering crashes the kernel without reported data exposure or modification.

The record

CVE
CVE-2026-31510
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=3.6
  2. Affected versionversion=54a59aa2b562872781d6a8fc89f300d360941691 <03d4eafb0f3788239df63575951f6b4c97bbfda4
  3. Affected versionversion=54a59aa2b562872781d6a8fc89f300d360941691 <0780f9333852971ca77d110019e3a66ce5a7b100
  4. Affected versionversion=54a59aa2b562872781d6a8fc89f300d360941691 <1dc6db047919ecd59493cd51248b37381bbabcbb
  5. Affected versionversion=54a59aa2b562872781d6a8fc89f300d360941691 <3c821bc0fbeaa27910a20d0b43c6008d099792af
  6. Affected versionversion=54a59aa2b562872781d6a8fc89f300d360941691 <898b89c90ff9496e64b9331040778cc4e1b28c9d
  7. Affected versionversion=54a59aa2b562872781d6a8fc89f300d360941691 <a04a760c06bb591989db659439efdf106f0bae76
  8. Affected versionversion=54a59aa2b562872781d6a8fc89f300d360941691 <b6552e0503973daf6f23bd6ed9273ef131ee364f
  9. Affected versionversion=54a59aa2b562872781d6a8fc89f300d360941691 <d34776c7fa1f2c510f1cdd14823aba701babb4ad

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.6; version=54a59aa2b562872781d6a8fc89f300d360941691 <03d4eafb0f3788239df63575951f6b4c97bbfda4; version=54a59aa2b562872781d6a8fc89f300d360941691 <0780f9333852971ca77d110019e3a66ce5a7b100; version=54a59aa2b562872781d6a8fc89f300d360941691 <1dc6db047919ecd59493cd51248b37381bbabcbb; version=54a59aa2b562872781d6a8fc89f300d360941691 <3c821bc0fbeaa27910a20d0b43c6008d099792af; version=54a59aa2b562872781d6a8fc89f300d360941691 <898b89c90ff9496e64b9331040778cc4e1b28c9d; version=54a59aa2b562872781d6a8fc89f300d360941691 <a04a760c06bb591989db659439efdf106f0bae76; version=54a59aa2b562872781d6a8fc89f300d360941691 <b6552e0503973daf6f23bd6ed9273ef131ee364f; version=54a59aa2b562872781d6a8fc89f300d360941691 <d34776c7fa1f2c510f1cdd14823aba701babb4ad

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

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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