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NVD / CVE Program· CNA Linux

CVE-2026-68376: sctp: fix auth_hmacs array size in struct sctp_cookie

Noroxi assessment

Priority: Monitor (action score 32/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.60% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 0528485f27016a42804abe01aa61b39d85fa803e, 0b4414e43e0861d67276031cc21401d7e87de3da, 317731d01b03c529809df36d3a7d149677a8729d; 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 0528485f27016a42804abe01aa61b39d85fa803e, 0b4414e43e0861d67276031cc21401d7e87de3da, 317731d01b03c529809df36d3a7d149677a8729d; 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_hmacs array size in struct sctp_cookie The auth_hmacs array in struct sctp_cookie is supposed to store a complete SCTP_AUTH_HMAC_ALGO parameter, which consists of a struct sctp_paramhdr followed by N HMAC identifiers. However, the array size was calculated using an extra 2 bytes instead of sizeof(struct sctp_paramhdr), which is 4 bytes. When four HMAC identifiers are configured, the HMAC-ALGO parameter stored in the endpoint is larger than the auth_hmacs buffer in the cookie. As a result, sctp_association_init() copies beyond the end of auth_hmacs when initializing the association, corrupting the adjacent auth_chunks field. This can lead to an invalid HMAC identifier being accepted and later cause an out-of-bounds read in sctp_auth_get_hmac(). Fix the array size calculation by including the full SCTP parameter header size.

HighCVSS 8.1 · v3.1—Proof of concept Fix available
Published
Aug 10, 2026
Updated
Oct 19, 2026
EPSS
0.6% · 49th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.1
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
  • Proof of concept exists, no weaponized module
  • A fix has been released

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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 317731d01b03c529809df36d3a7d149677a8729daffected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before 0528485f27016a42804abe01aa61b39d85fa803eaffected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before ee5e65964f456adfe14d526fba0bd055de98ecf3affected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before 0b4414e43e0861d67276031cc21401d7e87de3daaffected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before d0a59ba58578e2b330fff80a44fe519f3ba7d8c7affected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before a8d20ba0ab518c9ccbcde258f25fc1ee6e51d5dbaffected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before 3aa40c3bccac2312ea7cf97f329190637f972b5daffected · git
    • 1f485649f52929d9937b346a920a522a7363e202 and later · before e0b5252a59383b77d1b8dbeda00b7184dd95f4d3affected · 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
AlmaLinux:8bpftoolbefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.162.1.el8_104.18.0-553.162.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.162.1.rt7.503.el8_104.18.0-553.162.1.rt7.503.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.162.1.rt7.503.el8_104.18.0-553.162.1.rt7.503.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.162.1.rt7.503.el8_104.18.0-553.162.1.rt7.503.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.162.1.rt7.503.el8_104.18.0-553.162.1.rt7.503.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.162.1.rt7.503.el8_104.18.0-553.162.1.rt7.503.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.162.1.rt7.503.el8_104.18.0-553.162.1.rt7.503.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.162.1.rt7.503.el8_104.18.0-553.162.1.rt7.503.el8_10
AlmaLinux:8kernel-rt-develbefore 4.18.0-553.162.1.rt7.503.el8_104.18.0-553.162.1.rt7.503.el8_10
AlmaLinux:8kernel-rt-modulesbefore 4.18.0-553.162.1.rt7.503.el8_104.18.0-553.162.1.rt7.503.el8_10

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

Published before and after this one in the same product

  • ← EarlierCVE-2026-68374Aug 10, 2026 · usb: core: sysfs: add lock to bos_descriptors_read()
    31Monitor
  • ← EarlierCVE-2026-68375Aug 10, 2026 · bnxt_en: Handle partially initialized auxiliary devices
    0Monitor
  • Later →CVE-2026-68377Aug 10, 2026 · net/sched: act_tunnel_key: Defer dst_release to RCU callback
    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 Linux0528485f27016a42804abe01aa61b39d85fa803eVendor (CNA)
Linux Linux0b4414e43e0861d67276031cc21401d7e87de3daVendor (CNA)
Linux Linux317731d01b03c529809df36d3a7d149677a8729dVendor (CNA)
Linux Linux3aa40c3bccac2312ea7cf97f329190637f972b5dVendor (CNA)
Linux Linuxa8d20ba0ab518c9ccbcde258f25fc1ee6e51d5dbVendor (CNA)
Linux Linuxd0a59ba58578e2b330fff80a44fe519f3ba7d8c7Vendor (CNA)
Linux Linuxe0b5252a59383b77d1b8dbeda00b7184dd95f4d3Vendor (CNA)
Linux Linuxee5e65964f456adfe14d526fba0bd055de98ecf3Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.162.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.162.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-devel4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules-extra4.18.0-553.162.1.rt7.503.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package registry (OSV)
red hat:kernel-rt0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-core0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-core0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-debuginfo0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-devel0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-kvm0:4.18.0-553.162.1.rt7.503.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)

+19

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02026-09-22

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.

  1. Published
  2. First PoC+42 d
  3. TodayNov 5, 2026+87 d
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-2026-6455214 days apartvirtio-net: fix len check in receive_big()
    33Monitor
  • CVE-2026-6451516 days apartwifi: mac80211: fix MLE defragmentation
    33Monitor
  • CVE-2026-682530 days apartdrm/i915/hdcp: check streams[] bounds before overflow
    31Monitor

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

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
High
Privileges required
None
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:N/AC:H/PR:N/UI:N/S:U/C:H/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