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NVD / CVE Program· CNA Linux

CVE-2023-53372: sctp: fix a potential overflow in sctp_ifwdtsn_skip

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.38% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 32832a2caf82663870126c5186cf8f86c8b2a649, 4fbd094d4131a10d06a45d64158567052a35b3f4, 5c9367ac5a22d71841bcd00130f9146c9b227d57.

Low priority for now. Upgrade to Linux Linux 32832a2caf82663870126c5186cf8f86c8b2a649, 4fbd094d4131a10d06a45d64158567052a35b3f4, 5c9367ac5a22d71841bcd00130f9146c9b227d57 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: sctp: fix a potential overflow in sctp_ifwdtsn_skip Currently, when traversing ifwdtsn skips with _sctp_walk_ifwdtsn, it only checks the pos against the end of the chunk. However, the data left for the last pos may be < sizeof(struct sctp_ifwdtsn_skip), and dereference it as struct sctp_ifwdtsn_skip may cause coverflow. This patch fixes it by checking the pos against "the end of the chunk - sizeof(struct sctp_ifwdtsn_skip)" in sctp_ifwdtsn_skip, similar to sctp_fwdtsn_skip.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Sep 18, 2025
Updated
Aug 5, 2026
EPSS
0.3% · 32th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.8
CNA · Linux
8.2
0.4 point gap

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

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

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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

Affected versions

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

  • linux linux kernel4.16 and later · before 4.19.281
  • linux linux kernel4.20 and later · before 5.4.241
  • linux linux kernel5.5 and later · before 5.10.178
  • linux linux kernel5.11 and later · before 5.15.108
  • linux linux kernel5.16 and later · before 6.1.25
  • linux linux kernel6.2 and later · before 6.2.12
  • linux linux kernel6.3

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

    • 4.16affected
    • 0fc2ea922c8ad5520c80f03facbf396c81dce802 and later · before 4fbd094d4131a10d06a45d64158567052a35b3f4affected · git
    • 0fc2ea922c8ad5520c80f03facbf396c81dce802 and later · before ad831a7079c99c01e801764b53bc9997c2e9c0f7affected · git
    • 0fc2ea922c8ad5520c80f03facbf396c81dce802 and later · before 79b28f42214a3d0d6a8c514db3602260bd5d6cb5affected · git
    • 0fc2ea922c8ad5520c80f03facbf396c81dce802 and later · before 6109f5b13ce3e3e537db6f18976ec0e9118d1c6faffected · git
    • 0fc2ea922c8ad5520c80f03facbf396c81dce802 and later · before 5c9367ac5a22d71841bcd00130f9146c9b227d57affected · git
    • 0fc2ea922c8ad5520c80f03facbf396c81dce802 and later · before ad988e9b5ff04607e624a459209e8c2d0c15fc73affected · git
    • 0fc2ea922c8ad5520c80f03facbf396c81dce802 and later · before 32832a2caf82663870126c5186cf8f86c8b2a649affected · git
    • before 4.16not affected · semver
    • 4.19.281 and later · up to and including 4.19.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.25-16.1.25-1
Red Hat:rhel_aus:8.4::baseosbpftoolbefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseosbpftool-debuginfobefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernelbefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-abi-stablelistsbefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-corebefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-debugbefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-debug-corebefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-debug-debuginfobefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-debug-develbefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-debug-modulesbefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-debug-modules-extrabefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-debuginfobefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-debuginfo-common-x86_64before 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-develbefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-docbefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-modulesbefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-modules-extrabefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-toolsbefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-tools-debuginfobefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseoskernel-tools-libsbefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseosperfbefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseosperf-debuginfobefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4
Red Hat:rhel_aus:8.4::baseospython3-perfbefore 0:4.18.0-305.194.1.el8_40:4.18.0-305.194.1.el8_4

+25

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • 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

Published before and after this one in the same product

  • ← EarlierCVE-2023-53370Sep 18, 2025 · drm/amdgpu: fix memory leak in mes self test
    22Monitor
  • ← EarlierCVE-2023-53371Sep 18, 2025 · net/mlx5e: fix memory leak in mlx5e_fs_tt_redirect_any_create
    22Monitor
  • Later →CVE-2023-53373Sep 18, 2025 · crypto: seqiv - Handle EBUSY correctly
    31Monitor

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 Linux32832a2caf82663870126c5186cf8f86c8b2a649Vendor (CNA)
Linux Linux4fbd094d4131a10d06a45d64158567052a35b3f4Vendor (CNA)
Linux Linux5c9367ac5a22d71841bcd00130f9146c9b227d57Vendor (CNA)
Linux Linux6109f5b13ce3e3e537db6f18976ec0e9118d1c6fVendor (CNA)
Linux Linux79b28f42214a3d0d6a8c514db3602260bd5d6cb5Vendor (CNA)
Linux Linuxad831a7079c99c01e801764b53bc9997c2e9c0f7Vendor (CNA)
Linux Linuxad988e9b5ff04607e624a459209e8c2d0c15fc73Vendor (CNA)
debian:linux6.1.25-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-372.195.1.el8_6 · Red Hat:rhel_aus:8.6::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-372.195.1.el8_6 · Red Hat:rhel_aus:8.6::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-372.195.1.el8_6 · Red Hat:rhel_aus:8.6::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-372.195.1.el8_6 · Red Hat:rhel_aus:8.6::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-372.195.1.el8_6 · Red Hat:rhel_aus:8.6::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-372.195.1.el8_6 · Red Hat:rhel_aus:8.6::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-372.195.1.el8_6 · Red Hat:rhel_aus:8.6::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-372.195.1.el8_6 · Red Hat:rhel_aus:8.6::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-372.195.1.el8_6 · Red Hat:rhel_aus:8.6::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-372.195.1.el8_6 · Red Hat:rhel_aus:8.6::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-372.195.1.el8_6 · Red Hat:rhel_aus:8.6::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-372.195.1.el8_6 · Red Hat:rhel_aus:8.6::baseosPackage 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.

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

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 (6 more)

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

All records