CVE-2022-48986

Physical-memory access via confused DAX PUD walk

Published Oct 21, 2024 · Updated Aug 5, 2026

Memory corruption in the Linux kernel allows local users to read or write physical memory through an x86 device-DAX PUD mapping. gup_pud_range() treats a devmap-backed huge PUD as a page-table pointer when HUGETLB is disabled, causing a confused page-table walk. Access to a suitably aligned /dev/dax mapping is required; crafted entries permit page access, while invalid entries panic the host.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the Linux kernel allows local users to read or write physical memory through an x86 device-DAX PUD mapping. gup_pud_range() treats a devmap-backed huge PUD as a page-table pointer when HUGETLB is disabled, causing a confused page-table walk. Access to a suitably aligned /dev/dax mapping is required; crafted entries permit page access, while invalid entries panic the host.

The record

CVE
CVE-2022-48986
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.14.108 <4.15
  2. Affected versionversion=414fd080d125408cb15d04ff4907e1dd8145c8c7 <04edfa3dc06ecfc6133a33bc7271298782dee875
  3. Affected versionversion=414fd080d125408cb15d04ff4907e1dd8145c8c7 <3ac29732a2ffa64c7de13a072b0f2848b9c11037
  4. Affected versionversion=414fd080d125408cb15d04ff4907e1dd8145c8c7 <e06d13c36ded750c72521b600293befebb4e56c5
  5. Affected versionversion=414fd080d125408cb15d04ff4907e1dd8145c8c7 <f1cf856123ceb766c49967ec79b841030fa1741f
  6. Affected versionversion=414fd080d125408cb15d04ff4907e1dd8145c8c7 <fcd0ccd836ffad73d98a66f6fea7b16f735ea920
  7. Affected versionversion=4.19.31 <4.20
  8. Affected versionversion=4.9.165 <4.10
  9. Affected versionversion=5.0
  10. Affected versionversion=538162d21ac877b060dc057c89f13718f5caffc5
  11. Affected versionversion=8b1a7762e0dac5db42a003009fdcb425f10baa07
  12. Affected versionversion=c133d8eb894cb280f331608c6f1962ba9fbfe6b0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.14.108 <4.15; version=414fd080d125408cb15d04ff4907e1dd8145c8c7 <04edfa3dc06ecfc6133a33bc7271298782dee875; version=414fd080d125408cb15d04ff4907e1dd8145c8c7 <3ac29732a2ffa64c7de13a072b0f2848b9c11037; version=414fd080d125408cb15d04ff4907e1dd8145c8c7 <e06d13c36ded750c72521b600293befebb4e56c5; version=414fd080d125408cb15d04ff4907e1dd8145c8c7 <f1cf856123ceb766c49967ec79b841030fa1741f; version=414fd080d125408cb15d04ff4907e1dd8145c8c7 <fcd0ccd836ffad73d98a66f6fea7b16f735ea920; version=4.19.31 <4.20; version=4.9.165 <4.10; version=5.0; version=538162d21ac877b060dc057c89f13718f5caffc5; version=8b1a7762e0dac5db42a003009fdcb425f10baa07; version=c133d8eb894cb280f331608c6f1962ba9fbfe6b0

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

T1499Endpoint Denial of Service

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

See the directory against your own environment.

Your stack

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