CVE-2022-49555

Local kernel crash via timer teardown race

Published Feb 26, 2025 · Updated Aug 5, 2026

Timer teardown race in the Linux hci_qca Bluetooth driver from 4.3 allows local users to crash the kernel during device removal. The qca_close path used del_timer() while its work queue could rearm wake_retrans_timer, allowing freed timer state to corrupt the timer list. Reachability requires local low-privileged access and a system using the hci_qca driver; the documented operational consequence is a kernel crash.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Timer teardown race in the Linux hci_qca Bluetooth driver from 4.3 allows local users to crash the kernel during device removal. The qca_close path used del_timer() while its work queue could rearm wake_retrans_timer, allowing freed timer state to corrupt the timer list. Reachability requires local low-privileged access and a system using the hci_qca driver; the documented operational consequence is a kernel crash.

The record

CVE
CVE-2022-49555
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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

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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=0ff252c1976da5d80db1377eb39b551931e61826 <2717654ae022e6ea959a4b7b762702fe1a4690c2
  2. Affected versionversion=0ff252c1976da5d80db1377eb39b551931e61826 <37d17f63d085d601011964ade7371aeebeb6ed4b
  3. Affected versionversion=0ff252c1976da5d80db1377eb39b551931e61826 <4989bb03342941f2b730b37dfa38bce27b543661
  4. Affected versionversion=0ff252c1976da5d80db1377eb39b551931e61826 <72ef98445aca568a81c2da050532500a8345ad3a
  5. Affected versionversion=0ff252c1976da5d80db1377eb39b551931e61826 <db03727b4bbbbb36e6ef4cb655c670eefb6448e9
  6. Affected versionversion=4.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0ff252c1976da5d80db1377eb39b551931e61826 <2717654ae022e6ea959a4b7b762702fe1a4690c2; version=0ff252c1976da5d80db1377eb39b551931e61826 <37d17f63d085d601011964ade7371aeebeb6ed4b; version=0ff252c1976da5d80db1377eb39b551931e61826 <4989bb03342941f2b730b37dfa38bce27b543661; version=0ff252c1976da5d80db1377eb39b551931e61826 <72ef98445aca568a81c2da050532500a8345ad3a; version=0ff252c1976da5d80db1377eb39b551931e61826 <db03727b4bbbbb36e6ef4cb655c670eefb6448e9; version=4.3

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1UbuntuCVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 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

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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