CVE-2022-49910

Kernel compromise via L2CAP receive race

Published May 1, 2025 · Updated Aug 5, 2026

Use-after-free in the Linux kernel Bluetooth L2CAP subsystem allows adjacent attackers to crash or compromise the kernel via crafted traffic. A concurrent userspace receive can dequeue and free an SKB while l2cap_reassemble_sdu callers still read its control block. Reachability requires an active L2CAP ERTM or streaming channel and a socket reader; successful triggering can panic the kernel or enable memory corruption.

CVSS severity7.7
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

Use-after-free in the Linux kernel Bluetooth L2CAP subsystem allows adjacent attackers to crash or compromise the kernel via crafted traffic. A concurrent userspace receive can dequeue and free an SKB while l2cap_reassemble_sdu callers still read its control block. Reachability requires an active L2CAP ERTM or streaming channel and a socket reader; successful triggering can panic the kernel or enable memory corruption.

The record

CVE
CVE-2022-49910
Published
May 1, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <03af22e23b96fb7ef75fb7885407ef457e8b403d
  3. Affected versionversion=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <3aff8aaca4e36dc8b17eaa011684881a80238966
  4. Affected versionversion=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <4cd094fd5d872862ca278e15b9b51b07e915ef3f
  5. Affected versionversion=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <6c7407bfbeafc80a04e6eaedcf34d378532a04f2
  6. Affected versionversion=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <8278a87bb1eeea94350d675ef961ee5a03341fde
  7. Affected versionversion=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <9a04161244603f502c6e453913e51edd59cb70c1
  8. Affected versionversion=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <cb1c012099ef5904cd468bdb8d6fcdfdd9bcb569
  9. Affected versionversion=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <dc30e05bb18852303084430c03ca76e69257d9ea

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.6; version=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <03af22e23b96fb7ef75fb7885407ef457e8b403d; version=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <3aff8aaca4e36dc8b17eaa011684881a80238966; version=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <4cd094fd5d872862ca278e15b9b51b07e915ef3f; version=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <6c7407bfbeafc80a04e6eaedcf34d378532a04f2; version=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <8278a87bb1eeea94350d675ef961ee5a03341fde; version=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <9a04161244603f502c6e453913e51edd59cb70c1; version=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <cb1c012099ef5904cd468bdb8d6fcdfdd9bcb569; version=4b51dae96731c9d82f5634e75ac7ffd3b9c1b060 <dc30e05bb18852303084430c03ca76e69257d9ea

Published CVSS scores

7.7UbuntuCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Amazon LinuxCVSS: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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1210Exploitation of Remote Services

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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