CVE-2022-49648

Service interruption via leaked histogram variable names

Published Feb 26, 2025 · Updated May 23, 2026

A memory leak in affected Linux kernel releases allows local users to exhaust kernel memory through trace histogram triggers. parse_var_defs leaves the Nth var_defs.name allocation unreferenced when allocation of its paired var_defs.expr fails. Reachability requires local low-privileged access to the histogram trigger interface and an allocation failure; the bounded consequence is service interruption.

CVSS severity5.5
Medium
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

A memory leak in affected Linux kernel releases allows local users to exhaust kernel memory through trace histogram triggers. parse_var_defs leaves the Nth var_defs.name allocation unreferenced when allocation of its paired var_defs.expr fails. Reachability requires local low-privileged access to the histogram trigger interface and an allocation failure; the bounded consequence is service interruption.

The record

CVE
CVE-2022-49648
Published
Feb 26, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=240dd5118a9e0454f280ffeae63f22bd14735733 <eb622d5580b9e2ff694f62da6410618bd73853cb
  2. Affected versionversion=4.19.149 <4.19.253
  3. Affected versionversion=46bbe5c671e06f070428b9be142cc4ee5cedebac <22eeff55679d9e7c0f768c79bfbd83e2f8142d89
  4. Affected versionversion=46bbe5c671e06f070428b9be142cc4ee5cedebac <4d453eb5e1eec89971aa5b3262857ee26cfdffd3
  5. Affected versionversion=46bbe5c671e06f070428b9be142cc4ee5cedebac <78a1400c42ee11197eb1f0f85ba51df9a4fdfff0
  6. Affected versionversion=46bbe5c671e06f070428b9be142cc4ee5cedebac <7edc3945bdce9c39198a10d6129377a5c53559c2
  7. Affected versionversion=5.4.69 <5.4.207
  8. Affected versionversion=5.8.13 <5.9
  9. Affected versionversion=5.9
  10. Affected versionversion=e3a23511638a3dcf0275c1e71a46d1ca2e2e6788
  11. Affected versionversion=e92c490f104993cea35e5f5d5108ac12df1850ac <ecc6dec12c33aa92c086cd702af9f544ddaf3c75

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=240dd5118a9e0454f280ffeae63f22bd14735733 <eb622d5580b9e2ff694f62da6410618bd73853cb; version=4.19.149 <4.19.253; version=46bbe5c671e06f070428b9be142cc4ee5cedebac <22eeff55679d9e7c0f768c79bfbd83e2f8142d89; version=46bbe5c671e06f070428b9be142cc4ee5cedebac <4d453eb5e1eec89971aa5b3262857ee26cfdffd3; version=46bbe5c671e06f070428b9be142cc4ee5cedebac <78a1400c42ee11197eb1f0f85ba51df9a4fdfff0; version=46bbe5c671e06f070428b9be142cc4ee5cedebac <7edc3945bdce9c39198a10d6129377a5c53559c2; version=5.4.69 <5.4.207; version=5.8.13 <5.9; version=5.9; version=e3a23511638a3dcf0275c1e71a46d1ca2e2e6788; version=e92c490f104993cea35e5f5d5108ac12df1850ac <ecc6dec12c33aa92c086cd702af9f544ddaf3c75

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS: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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime

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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