CVE-2022-48947

Service interruption via L2CAP response-counter wraparound

Published Oct 21, 2024 · Updated May 11, 2026

Integer overflow in Linux Bluetooth L2CAP allows local users to interrupt system availability through repeated configuration requests. In l2cap_config_req, every L2CAP_CONF_REQ response increments the eight-bit chan->num_conf_rsp counter without a ceiling, so sustained requests wrap it after 255. Low-privileged local access to the Bluetooth configuration channel is required; published assessments report availability impact only, with no confidentiality or integrity effect.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Linux Bluetooth L2CAP allows local users to interrupt system availability through repeated configuration requests. In l2cap_config_req, every L2CAP_CONF_REQ response increments the eight-bit chan->num_conf_rsp counter without a ceiling, so sustained requests wrap it after 255. Low-privileged local access to the Bluetooth configuration channel is required; published assessments report availability impact only, with no confidentiality or integrity effect.

The record

CVE
CVE-2022-48947
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=2.6.32
  2. Affected versionversion=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <19a78143961a197de8502f4f29c453b913dc3c29
  3. Affected versionversion=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <49d5867819ab7c744852b45509e8469839c07e0e
  4. Affected versionversion=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <5550bbf709c323194881737fd290c4bada9e6ead
  5. Affected versionversion=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <95f1847a361c7b4bf7d74c06ecb6968455082c1a
  6. Affected versionversion=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <9fdc79b571434af7bc742da40a3405f038b637a7
  7. Affected versionversion=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <ad528fde0702903208d0a79d88d5a42ae3fc235b
  8. Affected versionversion=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <bcd70260ef56e0aee8a4fc6cd214a419900b0765
  9. Affected versionversion=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <f3fe6817156a2ad4b06f01afab04638a34d7c9a6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.32; version=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <19a78143961a197de8502f4f29c453b913dc3c29; version=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <49d5867819ab7c744852b45509e8469839c07e0e; version=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <5550bbf709c323194881737fd290c4bada9e6ead; version=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <95f1847a361c7b4bf7d74c06ecb6968455082c1a; version=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <9fdc79b571434af7bc742da40a3405f038b637a7; version=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <ad528fde0702903208d0a79d88d5a42ae3fc235b; version=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <bcd70260ef56e0aee8a4fc6cd214a419900b0765; version=f2fcfcd670257236ebf2088bbdf26f6a8ef459fe <f3fe6817156a2ad4b06f01afab04638a34d7c9a6

Published CVSS scores

6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS: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-190Integer Overflow or Wraparound
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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