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NVD / CVE Program· CNA Linux

CVE-2023-53817: crypto: lib/mpi - avoid null pointer deref in mpi_cmp_ui()

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.54% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0fc7147c694394f8a8cbc19570c6bc918cac0906, 12ac013ad7ff0df066451e825801d805095b3776, 61f5453e9706e99713825594e0c8f9031485fb5f.

Low priority for now. Upgrade to Linux Linux 0fc7147c694394f8a8cbc19570c6bc918cac0906, 12ac013ad7ff0df066451e825801d805095b3776, 61f5453e9706e99713825594e0c8f9031485fb5f 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

In the Linux kernel, the following vulnerability has been resolved: crypto: lib/mpi - avoid null pointer deref in mpi_cmp_ui() During NVMeTCP Authentication a controller can trigger a kernel oops by specifying the 8192 bit Diffie Hellman group and passing a correctly sized, but zeroed Diffie Hellamn value. mpi_cmp_ui() was detecting this if the second parameter was 0, but 1 is passed from dh_is_pubkey_valid(). This causes the null pointer u->d to be dereferenced towards the end of mpi_cmp_ui()

Published
Dec 8, 2025
Updated
Aug 5, 2026
EPSS
0.5% · 45th percentile
CWE
—

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CNA vs NVD score

NVD
—
CNA · Linux
7.5
NVD has not scored this yet; the score shown is the CNA’s.

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

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

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Follow CVE-2023-53817

When you'll hear from us

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  • 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.

—

Versions reported by the vendor

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

  • Linux Linux

    • 3.7affected
    • 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 and later · before fde791e8a96a64ea7b0ad2440e43586447a209c6affected · git
    • 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 and later · before ae63e84ffda74267bf7277c38415ba38389229a0affected · git
    • 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 and later · before 61f5453e9706e99713825594e0c8f9031485fb5faffected · git
    • 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 and later · before 0fc7147c694394f8a8cbc19570c6bc918cac0906affected · git
    • 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 and later · before 67589d247909043e94d2dd5fb590958e0f99d58daffected · git
    • 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 and later · before d3ad023a39f1127dcfd331c562673355dc078650affected · git
    • 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 and later · before 12ac013ad7ff0df066451e825801d805095b3776affected · git
    • 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 and later · before 9e47a758b70167c9301d2b44d2569f86c7796f2daffected · git
    • before 3.7not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.55-16.1.55-1
Debian:13linuxbefore 6.5.6-16.5.6-1
openSUSE:Leap 15.6dtb-aarch64before 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-64kbbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-debugbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-defaultbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-default-basebefore 6.4.0-150600.23.92.1.150600.12.42.26.4.0-150600.23.92.1.150600.12.42.2
openSUSE:Leap 15.6kernel-docsbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-kvmsmallbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-obs-buildbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-obs-qabefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-sourcebefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-symsbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-zfcpdumpbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
SUSE:Linux Enterprise Live Patching 12 SP5kernel-defaultbefore 4.12.14-122.296.14.12.14-122.296.1
SUSE:Linux Enterprise Live Patching 12 SP5kgraft-patch-SLE12-SP5_Update_78before 1-8.3.11-8.3.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-defaultbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_21before 1-150600.13.5.11-150600.13.5.1
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7_Update_10before 1-150700.15.3.11-150700.15.3.1
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7-RT_Update_10before 1-150700.1.3.11-150700.1.3.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-64kbbefore 6.4.0-150700.53.34.16.4.0-150700.53.34.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-defaultbefore 6.4.0-150700.53.34.16.4.0-150700.53.34.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-default-basebefore 6.4.0-150700.53.34.1.150700.17.23.16.4.0-150700.53.34.1.150700.17.23.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-sourcebefore 6.4.0-150700.53.34.16.4.0-150700.53.34.1

+21

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-53814Dec 8, 2025 · PCI: Fix dropping valid root bus resources with .end = zero
    0Monitor
  • ← EarlierCVE-2023-53815Dec 8, 2025 · posix-timers: Prevent RT livelock in itimer_delete()
    0Monitor
  • Later →CVE-2023-53818Dec 8, 2025 · ARM: zynq: Fix refcount leak in zynq_early_slcr_init
    0Monitor

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
Linux Linux0fc7147c694394f8a8cbc19570c6bc918cac0906Vendor (CNA)
Linux Linux12ac013ad7ff0df066451e825801d805095b3776Vendor (CNA)
Linux Linux61f5453e9706e99713825594e0c8f9031485fb5fVendor (CNA)
Linux Linux67589d247909043e94d2dd5fb590958e0f99d58dVendor (CNA)
Linux Linux9e47a758b70167c9301d2b44d2569f86c7796f2dVendor (CNA)
Linux Linuxae63e84ffda74267bf7277c38415ba38389229a0Vendor (CNA)
Linux Linuxd3ad023a39f1127dcfd331c562673355dc078650Vendor (CNA)
Linux Linuxfde791e8a96a64ea7b0ad2440e43586447a209c6Vendor (CNA)
debian:linux6.1.55-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.92.1.150600.12.42.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-build6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-qa6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-zfcpdump6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:kernel-64kb6.4.0-150600.23.92.1 · SUSE:Linux Enterprise Server 15 SP6-LTSSPackage registry (OSV)
suse:kernel-default6.4.0-150600.23.92.1 · SUSE:Linux Enterprise Live Patching 15 SP6Package registry (OSV)
suse:kernel-default-base6.4.0-150600.23.92.1.150600.12.42.2 · SUSE:Linux Enterprise Server 15 SP6-LTSSPackage registry (OSV)
suse:kernel-docs6.4.0-150600.23.92.1 · SUSE:Linux Enterprise Server 15 SP6-LTSSPackage registry (OSV)
suse:kernel-livepatch-SLE15-SP6_Update_211-150600.13.5.1 · SUSE:Linux Enterprise Live Patching 15 SP6Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7-RT_Update_101-150700.1.3.1 · SUSE:Linux Enterprise Live Patching 15 SP7Package registry (OSV)
suse:kernel-obs-build6.4.0-150600.23.92.1 · SUSE:Linux Enterprise Server 15 SP6-LTSSPackage registry (OSV)
suse:kernel-rt6.4.0-150700.7.34.1 · SUSE:Real Time Module 15 SP7Package registry (OSV)
suse:kernel-source6.4.0-150600.23.92.1 · SUSE:Linux Enterprise Server 15 SP6-LTSSPackage registry (OSV)

+4

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.

No history yet (it accumulates with the daily EPSS job).

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.

No credits in the CNA record.

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).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is 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
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

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 (7 more)

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

All records