NVD / CVE Program· CNA Linux

CVE-2026-68300: sctp: auth: verify auth requirement when auth_chunk is NULL

CriticalCVSS 9.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 39/100)

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: 0.58% (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.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: Linux Linux 18957373920caf5cdaf5cf32e5d1d7a99ca7700a, 28c5fdce9dd955d2baf5e28987819b6d7cfaf646, 5a022ac51ad83b4ce6c898f4b9eefc65bd26b247; 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 18957373920caf5cdaf5cf32e5d1d7a99ca7700a, 28c5fdce9dd955d2baf5e28987819b6d7cfaf646, 5a022ac51ad83b4ce6c898f4b9eefc65bd26b247; 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: auth: verify auth requirement when auth_chunk is NULL sctp_auth_chunk_verify() returns true unconditionally when chunk->auth_chunk is NULL, silently skipping authentication. This is incorrect when: 1. skb_clone() failed in the BH receive path, leaving auth_chunk NULL. In sctp_endpoint_bh_rcv() asoc is NULL for new connections, so the early sctp_auth_recv_cid() check cannot catch this. 2. No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never called and auth_chunk remains NULL. Fix by checking sctp_auth_recv_cid() when auth_chunk is NULL: if authentication is required, return false to drop the chunk; otherwise continue normally.

Published: Aug 10, 2026
Updated: Oct 19, 2026
EPSS: 0.5% · 48th percentile
CWE: CWE-287

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.5%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 9.8; 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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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
- bbd0d59809f923ea2b540cbd781b32110e249f6e and later · before a129792b3aef15002746c13522781d92ed3522c3affected · git
- bbd0d59809f923ea2b540cbd781b32110e249f6e and later · before 5a022ac51ad83b4ce6c898f4b9eefc65bd26b247affected · git
- bbd0d59809f923ea2b540cbd781b32110e249f6e and later · before 6caf0e8590c0bf05a76b0d387726adf3a6f3725caffected · git
- bbd0d59809f923ea2b540cbd781b32110e249f6e and later · before ec2e157fc9678a9bc411305a25aec3fd337d7efbaffected · git
- bbd0d59809f923ea2b540cbd781b32110e249f6e and later · before 28c5fdce9dd955d2baf5e28987819b6d7cfaf646affected · git
- bbd0d59809f923ea2b540cbd781b32110e249f6e and later · before 18957373920caf5cdaf5cf32e5d1d7a99ca7700aaffected · git
- bbd0d59809f923ea2b540cbd781b32110e249f6e and later · before 83f5031f2a6a49d696eb4cc0898345d12f9c6451affected · git
- bbd0d59809f923ea2b540cbd781b32110e249f6e and later · before 8e04823c120b376ef7dab14b60ebf6823aa16c14affected · git
- before 2.6.24not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
AlmaLinux:10	kernel	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k-core	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k-debug	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k-debug-core	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k-debug-devel	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k-debug-devel-matched	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k-debug-modules	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k-debug-modules-core	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k-debug-modules-extra	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k-devel	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k-devel-matched	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k-modules	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k-modules-core	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-64k-modules-extra	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-abi-stablelists	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-core	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-cross-headers	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-debug	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-debug-core	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-debug-devel	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-debug-devel-matched	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-debug-modules	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2
AlmaLinux:10	kernel-debug-modules-core	before 6.12.0-211.67.1.el10_2	6.12.0-211.67.1.el10_2

+96

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
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CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
40Plan

Published before and after this one in the same product

← EarlierCVE-2026-68298Aug 10, 2026 · drm/xe/vm: Fix SVM leak on resv obj alloc failure in xe_vm_create()
31Monitor
← EarlierCVE-2026-68299Aug 10, 2026 · vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets
30Monitor
Later →CVE-2026-68301Aug 10, 2026 · net: hsr: fix memory leak on slave unregistration by removing synced VLANs
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 / package	Fixed version	Source
Linux Linux	18957373920caf5cdaf5cf32e5d1d7a99ca7700a	Vendor (CNA)
Linux Linux	28c5fdce9dd955d2baf5e28987819b6d7cfaf646	Vendor (CNA)
Linux Linux	5a022ac51ad83b4ce6c898f4b9eefc65bd26b247	Vendor (CNA)
Linux Linux	6caf0e8590c0bf05a76b0d387726adf3a6f3725c	Vendor (CNA)
Linux Linux	83f5031f2a6a49d696eb4cc0898345d12f9c6451	Vendor (CNA)
Linux Linux	8e04823c120b376ef7dab14b60ebf6823aa16c14	Vendor (CNA)
Linux Linux	a129792b3aef15002746c13522781d92ed3522c3	Vendor (CNA)
Linux Linux	ec2e157fc9678a9bc411305a25aec3fd337d7efb	Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.0	6.6.150.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
almalinux:bpftool	4.18.0-553.162.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel	4.18.0-553.162.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt	4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-core	4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug	4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug-core	4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug-devel	4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug-modules	4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra	4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-devel	4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-modules	4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-modules-extra	4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8	Package registry (OSV)
debian:linux	6.1.187-1 · Debian:12	Package registry (OSV)
debian:linux-6.12	6.12.101-1~deb12u1 · Debian:12	Package registry (OSV)
red hat:kernel-rt	0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)
red hat:kernel-rt-core	0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)
red hat:kernel-rt-debug	0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)
red hat:kernel-rt-debug-core	0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)
red hat:kernel-rt-debug-debuginfo	0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)
red hat:kernel-rt-debug-devel	0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfv	Package registry (OSV)
red hat:kernel-rt-debug-kvm	0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfv	Package 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

TR-26-0800 · Aug 11, 2026(Linux Kernel Güvenlik Bildirimi)

All national notices →

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

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

nvd-secondary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1app.use("/admin", requireSession, adminRouter);
2

3// Route added later skips the middleware
4app.post("/admin-api/config", updateConfig);

Fixed

1const admin = express.Router();
2admin.use(requireSession, requireRole("admin"));
3

4admin.post("/config", updateConfig);
5app.use("/admin", admin);

Attack context

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

Attack patterns (CAPEC)

ATT&CK techniques

Change log (2)

SSVC exploitation— → noneOct 16, 2026, 5:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:07 PM UTC

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

References

git.kernel.org/stable/c/18957373920caf5cdaf5cf32e5d1d7a99ca7700a

Show all references (7 more)

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

All records