CVE-2026-31498

Memory exhaustion via zero-length L2CAP segmentation

Published Apr 22, 2026 · Updated Apr 22, 2026

Infinite loop in the Linux Kernel Bluetooth L2CAP stack allows local users to exhaust system memory through a crafted reconfiguration. On a connected ERTM channel, l2cap_config_req() reinitializes queues without freeing them, while a zero remote_mps makes l2cap_segment_sdu() loop without decrementing len. Low-privileged local access and a connected ERTM channel are required; successful abuse interrupts service by exhausting available memory.

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

Infinite loop in the Linux Kernel Bluetooth L2CAP stack allows local users to exhaust system memory through a crafted reconfiguration. On a connected ERTM channel, l2cap_config_req() reinitializes queues without freeing them, while a zero remote_mps makes l2cap_segment_sdu() loop without decrementing len. Low-privileged local access and a connected ERTM channel are required; successful abuse interrupts service by exhausting available memory.

The record

CVE
CVE-2026-31498
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-835, T1499.004
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=4ad03ff6f680681c5f78254e37c4c856fa953629
  2. Affected versionversion=5.7
  3. Affected versionversion=799263eb37a4f7f6d39334046929c3bc92452a7f
  4. Affected versionversion=8828622fb9b4201eeb0870587052e3d834cfaf61
  5. Affected versionversion=96298f640104e4cd9a913a6e50b0b981829b94ff <042e2cd4bb11e5313b19b87593616524949e4c52
  6. Affected versionversion=96298f640104e4cd9a913a6e50b0b981829b94ff <25f420a0d4cfd61d3d23ec4b9c56d9f443d91377
  7. Affected versionversion=96298f640104e4cd9a913a6e50b0b981829b94ff <52667c859fe33f70c2e711cb81bbd505d5eb8e75
  8. Affected versionversion=96298f640104e4cd9a913a6e50b0b981829b94ff <900e4db5385ec2cacd372345a80ab9c8e105b3a3
  9. Affected versionversion=96298f640104e4cd9a913a6e50b0b981829b94ff <9760b83cfd24b38caee663f429011a0dd6064fa9
  10. Affected versionversion=96298f640104e4cd9a913a6e50b0b981829b94ff <9a21a631ee034b1573dce14b572a24943dbfd7ae
  11. Affected versionversion=96298f640104e4cd9a913a6e50b0b981829b94ff <de37e2655b7abc3f59254c6b72256840f39fc6d5
  12. Affected versionversion=96298f640104e4cd9a913a6e50b0b981829b94ff <e7aab23b7df89a3d754a5f0a7d2237548b328bd0
  13. Affected versionversion=b432ea85ab8472763870dd0f2c186130dd36d68c
  14. Affected versionversion=b7d0ca715c1008acd2fc018f02a56fed88f78b75

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4ad03ff6f680681c5f78254e37c4c856fa953629; version=5.7; version=799263eb37a4f7f6d39334046929c3bc92452a7f; version=8828622fb9b4201eeb0870587052e3d834cfaf61; version=96298f640104e4cd9a913a6e50b0b981829b94ff <042e2cd4bb11e5313b19b87593616524949e4c52; version=96298f640104e4cd9a913a6e50b0b981829b94ff <25f420a0d4cfd61d3d23ec4b9c56d9f443d91377; version=96298f640104e4cd9a913a6e50b0b981829b94ff <52667c859fe33f70c2e711cb81bbd505d5eb8e75; version=96298f640104e4cd9a913a6e50b0b981829b94ff <900e4db5385ec2cacd372345a80ab9c8e105b3a3; version=96298f640104e4cd9a913a6e50b0b981829b94ff <9760b83cfd24b38caee663f429011a0dd6064fa9; version=96298f640104e4cd9a913a6e50b0b981829b94ff <9a21a631ee034b1573dce14b572a24943dbfd7ae; version=96298f640104e4cd9a913a6e50b0b981829b94ff <de37e2655b7abc3f59254c6b72256840f39fc6d5; version=96298f640104e4cd9a913a6e50b0b981829b94ff <e7aab23b7df89a3d754a5f0a7d2237548b328bd0; version=b432ea85ab8472763870dd0f2c186130dd36d68c; version=b7d0ca715c1008acd2fc018f02a56fed88f78b75

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-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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