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CVE-2026-43341· NVD / CVE Program· CNA Linux

net/ipv6: ioam6: prevent schema length wraparound in trace fill

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: 0.77% (FIRST EPSS); higher than 54.9% of all records.
  • 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 184d2e9db27c0f76226b5cad16fe29510a5d2280, 5e67ba9bb531e1ec6599a82a065dea9040b9ce50, 77695a69baca9b99d95fad09fc78c2318736604f.

Low priority for now. Upgrade to Linux Linux 184d2e9db27c0f76226b5cad16fe29510a5d2280, 5e67ba9bb531e1ec6599a82a065dea9040b9ce50, 77695a69baca9b99d95fad09fc78c2318736604f 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: net/ipv6: ioam6: prevent schema length wraparound in trace fill ioam6_fill_trace_data() stores the schema contribution to the trace length in a u8. With bit 22 enabled and the largest schema payload, sclen becomes 1 + 1020 / 4, wraps from 256 to 0, and bypasses the remaining-space check. __ioam6_fill_trace_data() then positions the write cursor without reserving the schema area but still copies the 4-byte schema header and the full schema payload, overrunning the trace buffer. Keep sclen in an unsigned int so the remaining-space check and the write cursor calculation both see the full schema length.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
May 8, 2026
Updated
Oct 16, 2026
EPSS
0.7% · 54th percentile
CWE
—

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

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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When you'll hear from us

  • when it enters CISA KEV
  • 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.

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 kernel5.15 and later · before 6.1.168
  • linux linux kernel6.2 and later · before 6.6.134
  • linux linux kernel6.7 and later · before 6.12.81
  • linux linux kernel6.13 and later · before 6.18.22
  • linux linux kernel6.19 and later · before 6.19.12
  • linux linux kernel7.0

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

    • 5.15affected
    • 8c6f6fa6772696be0c047a711858084b38763728 and later · before d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2affected · git
    • 8c6f6fa6772696be0c047a711858084b38763728 and later · before e96d48b37708d53cbdc47f6f60b0714fc4a5f596affected · git
    • 8c6f6fa6772696be0c047a711858084b38763728 and later · before d1b041080086e91d3733a5438a8c51ad5d3d8e09affected · git
    • 8c6f6fa6772696be0c047a711858084b38763728 and later · before 77695a69baca9b99d95fad09fc78c2318736604faffected · git
    • 8c6f6fa6772696be0c047a711858084b38763728 and later · before 184d2e9db27c0f76226b5cad16fe29510a5d2280affected · git
    • 8c6f6fa6772696be0c047a711858084b38763728 and later · before d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7daffected · git
    • 8c6f6fa6772696be0c047a711858084b38763728 and later · before 5e67ba9bb531e1ec6599a82a065dea9040b9ce50affected · git
    • before 5.15not affected · semver
    • 5.15.210 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • 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
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-43334May 8, 2026 · Bluetooth: SMP: force responder MITM requirements before building the pairing response
    35Monitor
  • ← EarlierCVE-2026-43339May 8, 2026 · ipv6: prevent possible UaF in addrconf_permanent_addr()
    31Monitor
  • Later →CVE-2026-43350May 8, 2026 · smb: client: require a full NFS mode SID before reading mode bits
    30Monitor

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 Linux184d2e9db27c0f76226b5cad16fe29510a5d2280Vendor (CNA)
Linux Linux5e67ba9bb531e1ec6599a82a065dea9040b9ce50Vendor (CNA)
Linux Linux77695a69baca9b99d95fad09fc78c2318736604fVendor (CNA)
Linux Linuxd1b041080086e91d3733a5438a8c51ad5d3d8e09Vendor (CNA)
Linux Linuxd3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2Vendor (CNA)
Linux Linuxd6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7dVendor (CNA)
Linux Linuxe96d48b37708d53cbdc47f6f60b0714fc4a5f596Vendor (CNA)
almalinux:kernel6.12.0-211.31.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.31.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.31.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.31.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.31.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.31.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.31.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.31.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.31.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.31.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.31.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.31.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.1.170-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-55.84.1.el10_0 · Red Hat:enterprise_linux_eus:10.0Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-55.84.1.el10_0 · Red Hat:enterprise_linux_eus:10.0Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-55.84.1.el10_0 · Red Hat:enterprise_linux_eus:10.0Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-55.84.1.el10_0 · Red Hat:enterprise_linux_eus:10.0Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-55.84.1.el10_0 · Red Hat:enterprise_linux_eus:10.0Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-55.84.1.el10_0 · Red Hat:enterprise_linux_eus:10.0Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-55.84.1.el10_0 · Red Hat:enterprise_linux_eus:10.0Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-55.84.1.el10_0 · Red Hat:enterprise_linux_eus:10.0Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-55.84.1.el10_0 · Red Hat:enterprise_linux_eus:10.0Package registry (OSV)
red hat:kernel-debuginfo0:6.12.0-55.84.1.el10_0 · Red Hat:enterprise_linux_eus:10.0Package registry (OSV)

+2

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

  • 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)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/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 (6 more)

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

All records