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Vulnerability Details :

CVE-2024-0564

Summary
Assigner-redhat
Assigner Org ID-53f830b8-0a3f-465b-8143-3b8a9948e749
Published At-30 Jan, 2024 | 15:01
Updated At-30 May, 2025 | 18:59
Rejected At-
Credits

Kernel: max page sharing of kernel samepage merging (ksm) may cause memory deduplication

A flaw was found in the Linux kernel's memory deduplication mechanism. The max page sharing of Kernel Samepage Merging (KSM), added in Linux kernel version 4.4.0-96.119, can create a side channel. When the attacker and the victim share the same host and the default setting of KSM is "max page sharing=256", it is possible for the attacker to time the unmap to merge with the victim's page. The unmapping time depends on whether it merges with the victim's page and additional physical pages are created beyond the KSM's "max page share". Through these operations, the attacker can leak the victim's page.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:redhat
Assigner Org ID:53f830b8-0a3f-465b-8143-3b8a9948e749
Published At:30 Jan, 2024 | 15:01
Updated At:30 May, 2025 | 18:59
Rejected At:
▼CVE Numbering Authority (CNA)
Kernel: max page sharing of kernel samepage merging (ksm) may cause memory deduplication

A flaw was found in the Linux kernel's memory deduplication mechanism. The max page sharing of Kernel Samepage Merging (KSM), added in Linux kernel version 4.4.0-96.119, can create a side channel. When the attacker and the victim share the same host and the default setting of KSM is "max page sharing=256", it is possible for the attacker to time the unmap to merge with the victim's page. The unmapping time depends on whether it merges with the victim's page and additional physical pages are created beyond the KSM's "max page share". Through these operations, the attacker can leak the victim's page.

Affected Products
Collection URL
https://git.kernel.org/pub/scm/linux/kernel
Package Name
kernel
Default Status
affected
Versions
Unaffected
  • From 0 before 4.4.0-96.119 (semver)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 6
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
kernel
CPEs
  • cpe:/o:redhat:enterprise_linux:6
Default Status
unknown
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 7
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
kernel
CPEs
  • cpe:/o:redhat:enterprise_linux:7
Default Status
unknown
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 7
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
kernel-rt
CPEs
  • cpe:/o:redhat:enterprise_linux:7
Default Status
unknown
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 8
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
kernel
CPEs
  • cpe:/o:redhat:enterprise_linux:8
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 8
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
kernel-rt
CPEs
  • cpe:/o:redhat:enterprise_linux:8
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 9
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
kernel
CPEs
  • cpe:/o:redhat:enterprise_linux:9
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 9
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
kernel-rt
CPEs
  • cpe:/o:redhat:enterprise_linux:9
Default Status
affected
Problem Types
TypeCWE IDDescription
CWECWE-203Observable Discrepancy
Type: CWE
CWE ID: CWE-203
Description: Observable Discrepancy
Metrics
VersionBase scoreBase severityVector
3.15.3MEDIUM
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Version: 3.1
Base score: 5.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Metrics Other Info
Red Hat severity rating
value:
Low
namespace:
https://access.redhat.com/security/updates/classification/
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

The mitigation shown below has a potentially significant impact on system performance and stability. It should be carefully tested prior to deployment: - Deactivation of memory deduplication Deactivating memory deduplication will effectively mitigate all attack vectors. This measure unfortunately eliminates all the highly appreciated benefits of memory deduplication, namely the increase of operational cost-effectiveness through inter-VM memory sharing. This will cause an increase in the amount of memory required and in some situations may adversely impact performance (e.g. due to slower swap space being used). It is recommended that customers test this workaround before using it in production. See https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/virtualization_tuning_and_optimization_guide/sect-ksm-deactivating_ksm for how to disable KSM from Red Hat Enterprise Linux 6 and newer. - Disabling services and firewall rules. The attack uses the response time of services on the system. By limiting access to services an attacker must connect to the service to successful carry out the exploit. Reducing the number of systems that are allowed to connect to the service will prevent an attack from working when launched outside an allowed ranges. While this does not prevent an attack from working, it will reduce the amount of systems that an attacker can launch an attack from.

Exploits

Credits

Timeline
EventDate
Reported to Red Hat.2024-01-15 00:00:00
Made public.2024-01-20 00:00:00
Event: Reported to Red Hat.
Date: 2024-01-15 00:00:00
Event: Made public.
Date: 2024-01-20 00:00:00
Replaced By

Rejected Reason

References
HyperlinkResource
https://access.redhat.com/security/cve/CVE-2024-0564
vdb-entry
x_refsource_REDHAT
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680513
N/A
https://bugzilla.redhat.com/show_bug.cgi?id=2258514
issue-tracking
x_refsource_REDHAT
https://link.springer.com/conference/wisa
N/A
https://wisa.or.kr/accepted
N/A
Hyperlink: https://access.redhat.com/security/cve/CVE-2024-0564
Resource:
vdb-entry
x_refsource_REDHAT
Hyperlink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680513
Resource: N/A
Hyperlink: https://bugzilla.redhat.com/show_bug.cgi?id=2258514
Resource:
issue-tracking
x_refsource_REDHAT
Hyperlink: https://link.springer.com/conference/wisa
Resource: N/A
Hyperlink: https://wisa.or.kr/accepted
Resource: N/A
▼Authorized Data Publishers (ADP)
1. CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://access.redhat.com/security/cve/CVE-2024-0564
vdb-entry
x_refsource_REDHAT
x_transferred
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680513
x_transferred
https://bugzilla.redhat.com/show_bug.cgi?id=2258514
issue-tracking
x_refsource_REDHAT
x_transferred
https://link.springer.com/conference/wisa
x_transferred
https://wisa.or.kr/accepted
x_transferred
Hyperlink: https://access.redhat.com/security/cve/CVE-2024-0564
Resource:
vdb-entry
x_refsource_REDHAT
x_transferred
Hyperlink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680513
Resource:
x_transferred
Hyperlink: https://bugzilla.redhat.com/show_bug.cgi?id=2258514
Resource:
issue-tracking
x_refsource_REDHAT
x_transferred
Hyperlink: https://link.springer.com/conference/wisa
Resource:
x_transferred
Hyperlink: https://wisa.or.kr/accepted
Resource:
x_transferred
2. CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:secalert@redhat.com
Published At:30 Jan, 2024 | 15:15
Updated At:25 Nov, 2024 | 09:15

A flaw was found in the Linux kernel's memory deduplication mechanism. The max page sharing of Kernel Samepage Merging (KSM), added in Linux kernel version 4.4.0-96.119, can create a side channel. When the attacker and the victim share the same host and the default setting of KSM is "max page sharing=256", it is possible for the attacker to time the unmap to merge with the victim's page. The unmapping time depends on whether it merges with the victim's page and additional physical pages are created beyond the KSM's "max page share". Through these operations, the attacker can leak the victim's page.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.15.3MEDIUM
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Primary3.16.5MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Type: Secondary
Version: 3.1
Base score: 5.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Type: Primary
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CPE Matches

Linux Kernel Organization, Inc
linux
>>linux_kernel>>Versions from 4.4.0-96.119(inclusive) to 5.15.0-58(inclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Red Hat, Inc.
redhat
>>enterprise_linux>>8.0
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
Red Hat, Inc.
redhat
>>enterprise_linux>>9.0
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-203Primarysecalert@redhat.com
CWE-203Secondarynvd@nist.gov
CWE ID: CWE-203
Type: Primary
Source: secalert@redhat.com
CWE ID: CWE-203
Type: Secondary
Source: nvd@nist.gov
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://access.redhat.com/security/cve/CVE-2024-0564secalert@redhat.com
Third Party Advisory
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680513secalert@redhat.com
Exploit
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2258514secalert@redhat.com
Issue Tracking
https://link.springer.com/conference/wisasecalert@redhat.com
Not Applicable
https://wisa.or.kr/acceptedsecalert@redhat.com
Not Applicable
https://access.redhat.com/security/cve/CVE-2024-0564af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680513af854a3a-2127-422b-91ae-364da2661108
Exploit
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2258514af854a3a-2127-422b-91ae-364da2661108
Issue Tracking
https://link.springer.com/conference/wisaaf854a3a-2127-422b-91ae-364da2661108
Not Applicable
https://wisa.or.kr/acceptedaf854a3a-2127-422b-91ae-364da2661108
Not Applicable
Hyperlink: https://access.redhat.com/security/cve/CVE-2024-0564
Source: secalert@redhat.com
Resource:
Third Party Advisory
Hyperlink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680513
Source: secalert@redhat.com
Resource:
Exploit
Issue Tracking
Hyperlink: https://bugzilla.redhat.com/show_bug.cgi?id=2258514
Source: secalert@redhat.com
Resource:
Issue Tracking
Hyperlink: https://link.springer.com/conference/wisa
Source: secalert@redhat.com
Resource:
Not Applicable
Hyperlink: https://wisa.or.kr/accepted
Source: secalert@redhat.com
Resource:
Not Applicable
Hyperlink: https://access.redhat.com/security/cve/CVE-2024-0564
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Third Party Advisory
Hyperlink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680513
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Exploit
Issue Tracking
Hyperlink: https://bugzilla.redhat.com/show_bug.cgi?id=2258514
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Issue Tracking
Hyperlink: https://link.springer.com/conference/wisa
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Not Applicable
Hyperlink: https://wisa.or.kr/accepted
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Not Applicable

Change History

0
Information is not available yet

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