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CVE-2023-35788

Public on

Last Modified: UTC

ImportantImportant ImpactWhat does this mean?
7.8CVSS v3 Base ScoreCVSS Score Breakdown


INSIGHTS VULNERABILITY ANALYSIS

View exposed systems


DESCRIPTION

A flaw was found in the TC flower classifier (cls_flower) in the Networking
subsystem of the Linux kernel. This issue occurs when sending two
TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets with a total size of 252 bytes, which
results in an out-of-bounds write when the third packet enters
fl_set_geneve_opt, potentially leading to a denial of service or privilege
escalation.

A flaw was found in the TC flower classifier (cls_flower) in the Networking
subsystem of the Linux kernel. This issue occurs when sending two
TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets with a total size of 252 bytes, which
results in an out-of-bounds write when the third packet enters
fl_set_geneve_opt, potentially leading to a denial of service or privilege
escalation.


STATEMENT

Red Hat Enterprise Linux 6 is not affected by this flaw as it did not include
support for the TC flower classifier.

Red Hat Enterprise Linux 6 is not affected by this flaw as it did not include
support for the TC flower classifier.


MITIGATION

This flaw can be mitigated by preventing the affected `cls_flower` kernel module
from being loaded. For instructions on how to blacklist a kernel module, please
see https://access.redhat.com/solutions/41278.





ADDITIONAL INFORMATION

 * Bugzilla 2215768: out-of-bounds write in fl_set_geneve_opt()
 * CWE-787: Out-of-bounds Write
 * FAQ: Frequently asked questions about CVE-2023-35788


EXTERNAL REFERENCES

https://www.cve.org/CVERecord?id=CVE-2023-35788
https://nvd.nist.gov/vuln/detail/CVE-2023-35788
https://www.openwall.com/lists/oss-security/2023/06/07/1

https://www.cve.org/CVERecord?id=CVE-2023-35788
https://nvd.nist.gov/vuln/detail/CVE-2023-35788
https://www.openwall.com/lists/oss-security/2023/06/07/1


AFFECTED PACKAGES AND ISSUED RED HAT SECURITY ERRATA

Search:

PlatformPackageStateErrataRelease DateRed Hat Enterprise Linux
7kpatch-patchFixedRHSA-2023:4834Red Hat Enterprise Linux 7.7 Update Services for
SAP Solutionskpatch-patchFixedRHSA-2023:4698Red Hat Enterprise Linux
8kpatch-patchFixedRHSA-2023:5221Red Hat Enterprise Linux 8.1 Update Services for
SAP Solutionskpatch-patchFixedRHSA-2023:4516Red Hat Enterprise Linux 8.2 Update
Services for SAP Solutionskpatch-patchFixedRHSA-2023:4829Red Hat Enterprise
Linux 8.4 Update Services for SAP Solutionskpatch-patchFixedRHSA-2023:4967Red
Hat Enterprise Linux 8.6 Extended Update
Supportkpatch-patchFixedRHSA-2023:4888Red Hat Enterprise Linux
9kpatch-patchFixedRHSA-2023:4380Red Hat Enterprise Linux 9.0 Extended Update
Supportkpatch-patchFixedRHSA-2023:5575Red Hat Enterprise Linux
7kernel-rtFixedRHSA-2023:4821

Show 102550100 entries
FirstPrevious1234NextLast
Showing 1 to 10 of 33 entries


Unless explicitly stated as not affected, all previous versions of packages in
any minor update stream of a product listed here should be assumed vulnerable,
although may not have been subject to full analysis.


COMMON VULNERABILITY SCORING SYSTEM (CVSS) SCORE DETAILS


IMPORTANT NOTE

CVSS scores for open source components depend on vendor-specific factors (e.g.
version or build chain). Therefore, Red Hat's score and impact rating can be
different from NVD and other vendors. Red Hat remains the authoritative CVE
Naming Authorities (CNA) source for its products and services (see Red Hat
classifications).

CVSS v3 Score BreakdownRed HatNVDCVSS v3 Base Score7.87.8Attack
VectorLocalLocalAttack ComplexityLowLowPrivileges RequiredLowLowUser
InteractionNoneNoneScopeUnchangedUnchangedConfidentiality
ImpactHighHighIntegrity ImpactHighHighAvailability ImpactHighHigh


CVSS V3 VECTOR

Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H


FREQUENTLY ASKED QUESTIONS


WHY IS RED HAT'S CVSS V3 SCORE OR IMPACT DIFFERENT FROM OTHER VENDORS?

For open source software shipped by multiple vendors, the CVSS base scores may
vary for each vendor's version depending on the version they ship, how they ship
it, the platform, and even how the software is compiled. This makes scoring of
vulnerabilities difficult for third-party vulnerability databases such as NVD
that only provide a single CVSS base score for each vulnerability. Red Hat
scores reflect how a vulnerability affects our products specifically.

For more information, see https://access.redhat.com/solutions/762393.


MY PRODUCT IS LISTED AS "UNDER INVESTIGATION" OR "AFFECTED", WHEN WILL RED HAT
RELEASE A FIX FOR THIS VULNERABILITY?

 * "Under investigation" doesn't necessarily mean that the product is affected
   by this vulnerability. It only means that our Analysis Team is still working
   on determining whether the product is affected and how it is affected.
 * "Affected" means that our Analysis Team has determined that this product is
   affected by this vulnerability and might release a fix to address this in the
   near future.


WHAT CAN I DO IF MY PRODUCT IS LISTED AS "WILL NOT FIX"?

This depends mostly on the Impact of the vulnerability and the Life Cycle phase
in which your product is currently in. Overall, you have the following options:
 * Upgrade to a supported product version that includes a fix for this
   vulnerability (recommended)
 * Apply a mitigation (if one exists)
 * Open a support case to request a prioritization of releasing a fix for this
   vulnerability


I HAVE A RED HAT PRODUCT BUT IT IS NOT IN THE ABOVE LIST, IS IT AFFECTED?

The listed products were found to include one or more of the components that
this vulnerability affects. These products underwent a thorough evaluation to
determine their affectedness by this vulnerability. Note that layered products
(such as container-based offerings) that consume affected components from any of
the products listed in this table may be affected and are not represented.


WHY IS MY SECURITY SCANNER REPORTING MY PRODUCT AS VULNERABLE TO THIS
VULNERABILITY EVEN THOUGH MY PRODUCT VERSION IS FIXED OR NOT AFFECTED?

In order to maintain code stability and compatibility, Red Hat usually does not
rebase packages to entirely new versions. Instead, we backport fixes and new
features to an older version of the package we distribute. This can result in
some security scanners that only consider the package version to report the
package as vulnerable. To avoid this, we suggest that you use an OVAL-compatible
security scanner like OpenSCAP.

For more information, see https://www.redhat.com/en/blog/determining-your-risk.

Not sure what something means? Check out our Security Glossary.

This page is generated automatically and has not been checked for errors or
omissions.

For clarification or corrections please contact Red Hat Product Security.

Last Modified: UTC

CVE description copyright © 2021



Red Hat


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