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CVE-2023-3772· NVD / CVE Program· CNA redhat

Kernel: xfrm: null pointer dereference in xfrm_update_ae_params()

Noroxi assessment

Priority: Monitor (action score 17/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.47% (FIRST EPSS).
  • Someone with local access to the system can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: linux (Debian:10) 4.19.304-1; linux (Debian:12) 6.1.52-1; linux (Debian:13) 6.4.13-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to linux (Debian:10) 4.19.304-1; linux (Debian:12) 6.1.52-1; linux (Debian:13) 6.4.13-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to directly dereference a NULL pointer in xfrm_update_ae_params(), leading to a possible kernel crash and denial of service.

MediumCVSS 4.4 · v3.1—No exploit Fix available
Published
Jul 25, 2023
Updated
Oct 14, 2026
EPSS
0.4% · 39th percentile

Report tools

JSON

Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CNA vs NVD score

NVD
4.4
CNA · redhat
5.5
1.1 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-3772

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
redhatenterprise linux
redhatenterprise linux for real time
redhatenterprise linux for real time for nfv
fedoraprojectfedora
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • debian debian linux12.0
  • fedoraproject fedoraall versions
  • linux linux kernelall versions
  • redhat enterprise linux8.0
  • redhat enterprise linux9.0
  • redhat enterprise linux for real time8.0
  • redhat enterprise linux for real time for nfv8.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown
    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • 0:4.18.0-513.5.1.rt7.307.el8_9 and laternot affected · rpm
    • 0:4.18.0-513.5.1.el8_9 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support

    • 0:4.18.0-372.87.1.el8_6 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support

    • 0:4.18.0-477.43.1.el8_8 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9

    • 0:5.14.0-362.8.1.el9_3 and laternot affected · rpm
    • 0:5.14.0-362.8.1.el9_3 and laternot affected · rpm
    • all versionsaffected

  • Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8

    • 0:4.18.0-372.87.1.el8_6 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:10linuxbefore 4.19.304-14.19.304-1
Debian:12linuxbefore 6.1.52-16.1.52-1
Debian:13linuxbefore 6.4.13-16.4.13-1
openSUSE:Leap 15.4dtb-aarch64before 5.14.21-150400.24.88.15.14.21-150400.24.88.1
openSUSE:Leap 15.4dtb-aarch64before 5.3.18-150300.59.133.15.3.18-150300.59.133.1
openSUSE:Leap 15.4kernel-debugbefore 5.14.21-150400.24.88.15.14.21-150400.24.88.1
openSUSE:Leap 15.4kernel-debugbefore 4.12.14-150100.197.157.14.12.14-150100.197.157.1
openSUSE:Leap 15.4kernel-kvmsmallbefore 4.12.14-150100.197.157.14.12.14-150100.197.157.1
openSUSE:Leap 15.4kernel-kvmsmallbefore 5.14.21-150400.24.88.15.14.21-150400.24.88.1
openSUSE:Leap 15.4kernel-obs-qabefore 5.14.21-150400.24.88.15.14.21-150400.24.88.1
openSUSE:Leap 15.4kernel-vanillabefore 4.12.14-150100.197.157.14.12.14-150100.197.157.1
openSUSE:Leap 15.5dtb-aarch64before 5.14.21-150500.55.28.15.14.21-150500.55.28.1
openSUSE:Leap 15.5kernel-debugbefore 5.14.21-150500.55.28.15.14.21-150500.55.28.1
openSUSE:Leap 15.5kernel-kvmsmallbefore 5.14.21-150500.55.28.15.14.21-150500.55.28.1
openSUSE:Leap 15.5kernel-obs-qabefore 5.14.21-150500.55.28.15.14.21-150500.55.28.1
openSUSE:Leap 15.6dtb-aarch64before 6.4.0-150600.23.73.16.4.0-150600.23.73.1
openSUSE:Leap 15.6kernel-debugbefore 6.4.0-150600.23.73.16.4.0-150600.23.73.1
openSUSE:Leap 15.6kernel-kvmsmallbefore 6.4.0-150600.23.73.16.4.0-150600.23.73.1
openSUSE:Leap 15.6kernel-obs-qabefore 6.4.0-150600.23.73.16.4.0-150600.23.73.1
SUSE:Linux Enterprise High Availability Extension 12 SP5kernel-defaultbefore 4.12.14-122.176.14.12.14-122.176.1
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSkernel-docsbefore 4.12.14-150100.197.157.14.12.14-150100.197.157.1
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSkernel-docsbefore 4.12.14-150100.197.157.14.12.14-150100.197.157.1
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSkernel-obs-buildbefore 4.12.14-150100.197.157.14.12.14-150100.197.157.1
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSkernel-obs-buildbefore 4.12.14-150100.197.157.14.12.14-150100.197.157.1

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2023-3640Jul 24, 2023 · Kernel: x86/mm: a per-cpu entry area leak was identified through the init_cea_offsets function when prefetchnta and prefetcht2 instructions being used for the p
    31Monitor
  • ← EarlierCVE-2023-3812Jul 24, 2023 · Kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags
    31Monitor
  • Later →CVE-2023-3773Jul 25, 2023 · Kernel: xfrm: out-of-bounds read of xfrma_mtimer_thresh nlattr
    17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:linux6.1.52-1 · Debian:12Package registry (OSV)
opensuse:kernel-azure5.14.21-150500.33.17.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-source-azure5.14.21-150500.33.17.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-syms-azure5.14.21-150500.33.17.1 · openSUSE:Leap 15.5Package registry (OSV)
suse:kernel-azure5.14.21-150500.33.17.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5Package registry (OSV)
suse:kernel-default4.12.14-150100.197.157.1 · SUSE:Linux Enterprise Live Patching 15 SP1Package registry (OSV)
suse:kernel-docs4.12.14-150100.197.157.1 · SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSPackage registry (OSV)
suse:kernel-livepatch-SLE15-SP1_Update_441-150100.3.3.1 · SUSE:Linux Enterprise Live Patching 15 SP1Package registry (OSV)
suse:kernel-livepatch-SLE15-SP4-RT_Update_121-150400.1.3.1 · SUSE:Linux Enterprise Live Patching 15 SP4Package registry (OSV)
suse:kernel-livepatch-SLE15-SP5-RT_Update_41-150500.11.3.1 · SUSE:Linux Enterprise Live Patching 15 SP5Package registry (OSV)
suse:kernel-obs-build4.12.14-150100.197.157.1 · SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSPackage registry (OSV)
suse:kernel-rt4.12.14-10.141.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kernel-rt_debug4.12.14-10.141.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kernel-source4.12.14-150100.197.157.1 · SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSPackage registry (OSV)
suse:kernel-source-azure5.14.21-150500.33.17.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5Package registry (OSV)
suse:kernel-source-rt4.12.14-10.141.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kernel-syms4.12.14-150100.197.157.1 · SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSPackage registry (OSV)
suse:kernel-syms-azure5.14.21-150500.33.17.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5Package registry (OSV)
suse:kernel-syms-rt4.12.14-10.141.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (13 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records