CVE-2022-49565

System interruption via premature LBR quirk check

Published Feb 26, 2025 · Updated May 11, 2026

Denial of service in Linux kernel 5.17 through 5.18.14 allows local users to interrupt the system through Intel LBR handling. The lbr_from_signext_quirk_needed() check runs before intel_pmu_lbr_init() parses the LBR format, so the required TSX quirk is skipped. Exploitation requires an Intel Haswell system using LBR_FORMAT_EIP_FLAGS2 with TSX disabled, where the resulting unchecked MSR write triggers a general-protection fault.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel 5.17 through 5.18.14 allows local users to interrupt the system through Intel LBR handling. The lbr_from_signext_quirk_needed() check runs before intel_pmu_lbr_init() parses the LBR format, so the required TSX quirk is skipped. Exploitation requires an Intel Haswell system using LBR_FORMAT_EIP_FLAGS2 with TSX disabled, where the resulting unchecked MSR write triggers a general-protection fault.

The record

CVE
CVE-2022-49565
Published
Feb 26, 2025
Updated
May 11, 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. 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=1ac7fd8159a842b3aa51f0b46a351fa3eeb8fbf3 <625bcd0685a1612225df83468c83412fc0edb3d7
  2. Affected versionversion=1ac7fd8159a842b3aa51f0b46a351fa3eeb8fbf3 <b0380e13502adf7dd8be4c47d622c3522aae6c63
  3. Affected versionversion=5.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1ac7fd8159a842b3aa51f0b46a351fa3eeb8fbf3 <625bcd0685a1612225df83468c83412fc0edb3d7; version=1ac7fd8159a842b3aa51f0b46a351fa3eeb8fbf3 <b0380e13502adf7dd8be4c47d622c3522aae6c63; version=5.17

Published CVSS scores

5.5UbuntuCVSS: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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