CVE-2022-49395

Kernel stack disclosure via byte-count confusion

Published Feb 26, 2025 · Updated May 11, 2026

An out-of-bounds read in affected Linux User-Mode Linux kernels allows local users to read kernel stack data during LDT setup. The write_ldt_entry function passes a 16-byte LDT descriptor size as a byte count to syscall_stub_data, which treats the value as a count of longs and copies 128 bytes from the stack object. The affected code is confined to x86 User-Mode Linux, and the observed fault occurs while a new memory context initializes its LDT.

CVSS severity7.1
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in affected Linux User-Mode Linux kernels allows local users to read kernel stack data during LDT setup. The write_ldt_entry function passes a 16-byte LDT descriptor size as a byte count to syscall_stub_data, which treats the value as a count of longs and copies 128 bytes from the stack object. The affected code is confined to x86 User-Mode Linux, and the observed fault occurs while a new memory context initializes its LDT.

The record

CVE
CVE-2022-49395
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
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=2.6.15
  2. Affected versionversion=858259cf7d1c443c836a2022b78cb281f0a9b95e <10995a382271254bd276627ec74136da4a23c4a6
  3. Affected versionversion=858259cf7d1c443c836a2022b78cb281f0a9b95e <24ca648bf5f72ed8878cf09b5d4431935779681e
  4. Affected versionversion=858259cf7d1c443c836a2022b78cb281f0a9b95e <2a4a62a14be1947fa945c5c11ebf67326381a568
  5. Affected versionversion=858259cf7d1c443c836a2022b78cb281f0a9b95e <3549ab4b962cf619e8c55484a0d870a34b3f845f
  6. Affected versionversion=858259cf7d1c443c836a2022b78cb281f0a9b95e <668ca34a428d6ffc0f99a1a6a9b661a288d4183b
  7. Affected versionversion=858259cf7d1c443c836a2022b78cb281f0a9b95e <91e5ba2af2d729d5126aefd5aa3eadc69b8426e5
  8. Affected versionversion=858259cf7d1c443c836a2022b78cb281f0a9b95e <9caad70819aef3431abaf73ba5163b55b161aba0
  9. Affected versionversion=858259cf7d1c443c836a2022b78cb281f0a9b95e <cf0dabc37446c5ee538ae7b4c467ab0e53fa5463
  10. Affected versionversion=858259cf7d1c443c836a2022b78cb281f0a9b95e <ef1dc929a1e5fa1b2d842256db9fb8710d3be910

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.15; version=858259cf7d1c443c836a2022b78cb281f0a9b95e <10995a382271254bd276627ec74136da4a23c4a6; version=858259cf7d1c443c836a2022b78cb281f0a9b95e <24ca648bf5f72ed8878cf09b5d4431935779681e; version=858259cf7d1c443c836a2022b78cb281f0a9b95e <2a4a62a14be1947fa945c5c11ebf67326381a568; version=858259cf7d1c443c836a2022b78cb281f0a9b95e <3549ab4b962cf619e8c55484a0d870a34b3f845f; version=858259cf7d1c443c836a2022b78cb281f0a9b95e <668ca34a428d6ffc0f99a1a6a9b661a288d4183b; version=858259cf7d1c443c836a2022b78cb281f0a9b95e <91e5ba2af2d729d5126aefd5aa3eadc69b8426e5; version=858259cf7d1c443c836a2022b78cb281f0a9b95e <9caad70819aef3431abaf73ba5163b55b161aba0; version=858259cf7d1c443c836a2022b78cb281f0a9b95e <cf0dabc37446c5ee538ae7b4c467ab0e53fa5463; version=858259cf7d1c443c836a2022b78cb281f0a9b95e <ef1dc929a1e5fa1b2d842256db9fb8710d3be910

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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-125Out-of-bounds Read

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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