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NVD / CVE Program· CNA Linux

CVE-2026-68320: sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid

Noroxi assessment

Priority: Monitor (action score 29/100)

  • 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: 0.12% (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 11092d79eb2b7c0068382f72fc2416d1786bb2e0, 3d22a7da2e264f407c729f33a0a346ff76108bc6, 54bb4c03fa17cdcb157c26c33e60a78cf32960f5; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 11092d79eb2b7c0068382f72fc2416d1786bb2e0, 3d22a7da2e264f407c729f33a0a346ff76108bc6, 54bb4c03fa17cdcb157c26c33e60a78cf32960f5; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 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

In the Linux kernel, the following vulnerability has been resolved: sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid sctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the capacity limit for ep->auth_chunk_list, allowing it to hold up to 20 chunk entries (param_hdr.length up to 24). However, the copy destination asoc->c.auth_chunks in struct sctp_cookie is only SCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16 chunks are added, sctp_association_init() memcpy overflows the destination by up to 4 bytes. Fix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching the destination capacity.

HighCVSS 7.3 · v3.1—No exploit Fix available
Published
Aug 10, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

29

Monitor

Low priority for now.

CVSS
29 / 40 · 7.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.3
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.

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.

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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

    • 2.6.24affected
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before 3d22a7da2e264f407c729f33a0a346ff76108bc6affected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before 6837c1c19a259518974cbc5a52017646e3906564affected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before 54bb4c03fa17cdcb157c26c33e60a78cf32960f5affected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before 5a365f1e423444c5da7eb689a8661633dad43e48affected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before 886e28e14ab655012779016d251fef53d103aa12affected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before 11092d79eb2b7c0068382f72fc2416d1786bb2e0affected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before b6ea3dda09eb4d5caf7bbc00f857688cf9e98255affected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before ff04b26794a16a8a879eb4fd2c02c2d6b03850e9affected · git
    • before 2.6.24not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.101-1~deb12u16.12.101-1~deb12u1
Debian:13linuxbefore 6.12.101-16.12.101-1
Debian:14linuxbefore 7.1.6-17.1.6-1

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-2026-68315Aug 10, 2026 · sctp: validate stream count in sctp_process_strreset_inreq()
    30Monitor
  • ← EarlierCVE-2026-68318Aug 10, 2026 · pds_core: fix use-after-free on workqueue during remove
    0Monitor
  • Later →CVE-2026-68323Aug 10, 2026 · tipc: serialize udp bearer replicast list updates
    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 Linux11092d79eb2b7c0068382f72fc2416d1786bb2e0Vendor (CNA)
Linux Linux3d22a7da2e264f407c729f33a0a346ff76108bc6Vendor (CNA)
Linux Linux54bb4c03fa17cdcb157c26c33e60a78cf32960f5Vendor (CNA)
Linux Linux5a365f1e423444c5da7eb689a8661633dad43e48Vendor (CNA)
Linux Linux6837c1c19a259518974cbc5a52017646e3906564Vendor (CNA)
Linux Linux886e28e14ab655012779016d251fef53d103aa12Vendor (CNA)
Linux Linuxb6ea3dda09eb4d5caf7bbc00f857688cf9e98255Vendor (CNA)
Linux Linuxff04b26794a16a8a879eb4fd2c02c2d6b03850e9Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package 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.

  • CVE-2026-720985 days apartdm-verity: fix buffer overflow in FEC calculation
    39Monitor
  • CVE-2025-68811209 days apartsvcrdma: use rc_pageoff for memcpy byte offset
    39Monitor
  • CVE-2026-681280 days apartice: reject out-of-range ptype in ice_parser_profile_init
    35Monitor
  • CVE-2026-6391622 days apartHID: wacom: Fix OOB write in wacom_hid_set_device_mode()
    35Monitor
  • CVE-2026-6455214 days apartvirtio-net: fix len check in receive_big()
    33Monitor
  • CVE-2026-6451516 days apartwifi: mac80211: fix MLE defragmentation
    33Monitor

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.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · 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
Low
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:L/I:H/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. SSVC exploitation— → none
  2. 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