CVE-2026-31393

Kernel-memory disclosure via truncated L2CAP response

Published Apr 3, 2026 · Updated Apr 3, 2026

Out-of-bounds read in the Linux Kernel Bluetooth L2CAP handler allows physically proximate attackers to expose adjacent kernel memory. l2cap_information_rsp() accepts a four-byte success response, then get_unaligned_le32() or rsp->data[0] reads one to four bytes beyond the header without confirming that cmd_len includes the payload. Exploitation requires Bluetooth radio range but no local credentials or user action, and the same response can trigger a kernel fault, oops, or panic.

CVSS severity8.1
High
EPSS probability0.26%
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 read in the Linux Kernel Bluetooth L2CAP handler allows physically proximate attackers to expose adjacent kernel memory. l2cap_information_rsp() accepts a four-byte success response, then get_unaligned_le32() or rsp->data[0] reads one to four bytes beyond the header without confirming that cmd_len includes the payload. Exploitation requires Bluetooth radio range but no local credentials or user action, and the same response can trigger a kernel fault, oops, or panic.

The record

CVE
CVE-2026-31393
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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=2.6.24
  2. Affected versionversion=4e8402a3f884427f9233ba436459c158d1f2e114 <3b646516cba2ebc4b51a72954903326e7c1e443f
  3. Affected versionversion=4e8402a3f884427f9233ba436459c158d1f2e114 <807bd1258453c4c83f6ae9dbc1e7b44860ff40d0
  4. Affected versionversion=4e8402a3f884427f9233ba436459c158d1f2e114 <9aeacde4da0f02d42fd968fd32f245828b230171
  5. Affected versionversion=4e8402a3f884427f9233ba436459c158d1f2e114 <db2872d054e467810078e2b9f440a5b326a601b2
  6. Affected versionversion=4e8402a3f884427f9233ba436459c158d1f2e114 <dd815e6e3918dc75a49aaabac36e4f024d675101
  7. Affected versionversion=4e8402a3f884427f9233ba436459c158d1f2e114 <e7ff754e339e3d5ce29aa9f95352d0186df8fbd9

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.24; version=4e8402a3f884427f9233ba436459c158d1f2e114 <3b646516cba2ebc4b51a72954903326e7c1e443f; version=4e8402a3f884427f9233ba436459c158d1f2e114 <807bd1258453c4c83f6ae9dbc1e7b44860ff40d0; version=4e8402a3f884427f9233ba436459c158d1f2e114 <9aeacde4da0f02d42fd968fd32f245828b230171; version=4e8402a3f884427f9233ba436459c158d1f2e114 <db2872d054e467810078e2b9f440a5b326a601b2; version=4e8402a3f884427f9233ba436459c158d1f2e114 <dd815e6e3918dc75a49aaabac36e4f024d675101; version=4e8402a3f884427f9233ba436459c158d1f2e114 <e7ff754e339e3d5ce29aa9f95352d0186df8fbd9

Published CVSS scores

8.1kernel.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
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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