CVE-2022-48804

Kernel memory disclosure via transient console-index underflow

Published Jul 16, 2024 · Updated May 23, 2026

Integer underflow in Linux virtual-terminal handling allows local users to expose kernel memory through a crafted VT_SETACTIVATE ioctl. In vt_setactivate, array_index_nospec sanitizes vsa.console before the code subtracts one, so a transient zero becomes an underflowed array index. Access to a permitted local virtual terminal is required; SUSE characterizes the consequence as confidentiality loss, while NVD characterizes it as service interruption.

CVSS severity5.5
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in Linux virtual-terminal handling allows local users to expose kernel memory through a crafted VT_SETACTIVATE ioctl. In vt_setactivate, array_index_nospec sanitizes vsa.console before the code subtracts one, so a transient zero becomes an underflowed array index. Access to a permitted local virtual terminal is required; SUSE characterizes the consequence as confidentiality loss, while NVD characterizes it as service interruption.

The record

CVE
CVE-2022-48804
Published
Jul 16, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-191
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 16, 2024CVE 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=0ec459ec174031fad02a55e622cf2fc0d2e75a25 <830c5aa302ec16b4ee641aec769462c37f802c90
  2. Affected versionversion=1aa698b65186c13ed775896ed1dfec7c26c73d60
  3. Affected versionversion=3.16.62 <3.17
  4. Affected versionversion=4.14.73 <4.14.267
  5. Affected versionversion=4.18.11 <4.19
  6. Affected versionversion=4.19
  7. Affected versionversion=4334a6ae867aa12f01c1755368fd0de4c926ac75 <2a45a6bd1e6d651770aafff57ab3e1d3bb0b42e0
  8. Affected versionversion=4.4.159 <4.5
  9. Affected versionversion=458697ab18b512445ac273ce68a9f8fd623fc0a3
  10. Affected versionversion=4.9.130 <4.9.302
  11. Affected versionversion=52ef74c21c277e50de771fc722d814a830b3036b
  12. Affected versionversion=e97267cb4d1ee01ca0929638ec0fcbb0904f903d <170325aba4608bde3e7d21c9c19b7bc266ac0885
  13. Affected versionversion=e97267cb4d1ee01ca0929638ec0fcbb0904f903d <61cc70d9e8ef5b042d4ed87994d20100ec8896d9
  14. Affected versionversion=e97267cb4d1ee01ca0929638ec0fcbb0904f903d <6550bdf52846f85a2a3726a5aa0c7c4399f2fc02
  15. Affected versionversion=e97267cb4d1ee01ca0929638ec0fcbb0904f903d <778302ca09498b448620edd372dc908bebf80bdf
  16. Affected versionversion=e97267cb4d1ee01ca0929638ec0fcbb0904f903d <ae3d57411562260ee3f4fd5e875f410002341104
  17. Affected versionversion=e97267cb4d1ee01ca0929638ec0fcbb0904f903d <ffe54289b02e9c732d6f04c8ebbe3b2d90d32118

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0ec459ec174031fad02a55e622cf2fc0d2e75a25 <830c5aa302ec16b4ee641aec769462c37f802c90; version=1aa698b65186c13ed775896ed1dfec7c26c73d60; version=3.16.62 <3.17; version=4.14.73 <4.14.267; version=4.18.11 <4.19; version=4.19; version=4334a6ae867aa12f01c1755368fd0de4c926ac75 <2a45a6bd1e6d651770aafff57ab3e1d3bb0b42e0; version=4.4.159 <4.5; version=458697ab18b512445ac273ce68a9f8fd623fc0a3; version=4.9.130 <4.9.302; version=52ef74c21c277e50de771fc722d814a830b3036b; version=e97267cb4d1ee01ca0929638ec0fcbb0904f903d <170325aba4608bde3e7d21c9c19b7bc266ac0885; version=e97267cb4d1ee01ca0929638ec0fcbb0904f903d <61cc70d9e8ef5b042d4ed87994d20100ec8896d9; version=e97267cb4d1ee01ca0929638ec0fcbb0904f903d <6550bdf52846f85a2a3726a5aa0c7c4399f2fc02; version=e97267cb4d1ee01ca0929638ec0fcbb0904f903d <778302ca09498b448620edd372dc908bebf80bdf; version=e97267cb4d1ee01ca0929638ec0fcbb0904f903d <ae3d57411562260ee3f4fd5e875f410002341104; version=e97267cb4d1ee01ca0929638ec0fcbb0904f903d <ffe54289b02e9c732d6f04c8ebbe3b2d90d32118

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

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-191Integer Underflow (Wrap or Wraparound)

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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