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NVD / CVE Program· CNA Linux

CVE-2026-68125: mac802154: llsec: reject frames shorter than the authentication tag

HighCVSS 8.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 35/100)

  • 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: 0.31% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 2d6b42a61373144298070668fddf06efe79cf2ff, 5bbf0cd9b6a7076af86c75e87e180099be2e11ae, de80808f37d99c6dc67bb6f97eea00c8f57a8821; 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 2d6b42a61373144298070668fddf06efe79cf2ff, 5bbf0cd9b6a7076af86c75e87e180099be2e11ae, de80808f37d99c6dc67bb6f97eea00c8f57a8821; 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: mac802154: llsec: reject frames shorter than the authentication tag llsec_do_decrypt_auth() computes the associated-data length for the AEAD request as assoclen += datalen - authlen; where datalen is the number of bytes after the MAC header and authlen (4, 8 or 16) is the length of the authentication tag. Nothing verifies that the frame actually carries at least authlen payload bytes. A secured frame whose payload is shorter than the tag makes datalen - authlen negative; assoclen is then passed to aead_request_set_ad() as an unsigned value close to 4 GiB, so crypto_aead_decrypt() walks far off the end of the scatterlist that only spans the real frame. The frame is fully attacker-controlled and reaches this path from any IEEE 802.15.4 peer in radio range. Reject frames whose payload is shorter than the authentication tag before the subtraction. Dynamically reproduced on a KASAN kernel as a general-protection-fault in the AEAD scatterwalk, and the fix confirmed.

Published
Aug 10, 2026
Updated
Oct 19, 2026
EPSS
0.3% · 24th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 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
—
CNA · Linux
8.8
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

    • 3.16affected
    • 4c14a2fb5d143e4ed94143be2b8c1961b47df9af and later · before f27ce82eb04960465df71634b196a48a4ecafd50affected · git
    • 4c14a2fb5d143e4ed94143be2b8c1961b47df9af and later · before 2d6b42a61373144298070668fddf06efe79cf2ffaffected · git
    • 4c14a2fb5d143e4ed94143be2b8c1961b47df9af and later · before ec7e62d77193131227df49d654d118fdf5a59892affected · git
    • 4c14a2fb5d143e4ed94143be2b8c1961b47df9af and later · before 5bbf0cd9b6a7076af86c75e87e180099be2e11aeaffected · git
    • 4c14a2fb5d143e4ed94143be2b8c1961b47df9af and later · before de80808f37d99c6dc67bb6f97eea00c8f57a8821affected · git
    • 4c14a2fb5d143e4ed94143be2b8c1961b47df9af and later · before f20dedce0429b293d4bad604e0d3f65d8ac96c83affected · git
    • 4c14a2fb5d143e4ed94143be2b8c1961b47df9af and later · before e09e0301d616c1ef38a5e64e8e4326fd39df13ccaffected · git
    • 4c14a2fb5d143e4ed94143be2b8c1961b47df9af and later · before fd3a3f28ed60c6af4b2a39933b151d6b27842c3baffected · git
    • before 3.16not 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-2026-68121Aug 10, 2026 · pppoe: reload header pointer after dev_hard_header()
    31Monitor
  • ← EarlierCVE-2026-68123Aug 10, 2026 · openvswitch: fix GSO userspace truncation underflow
    39Monitor
  • Later →CVE-2026-68127Aug 10, 2026 · ila: reload IPv6 header after pskb_may_pull in checksum adjust
    39Monitor

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 Linux2d6b42a61373144298070668fddf06efe79cf2ffVendor (CNA)
Linux Linux5bbf0cd9b6a7076af86c75e87e180099be2e11aeVendor (CNA)
Linux Linuxde80808f37d99c6dc67bb6f97eea00c8f57a8821Vendor (CNA)
Linux Linuxe09e0301d616c1ef38a5e64e8e4326fd39df13ccVendor (CNA)
Linux Linuxec7e62d77193131227df49d654d118fdf5a59892Vendor (CNA)
Linux Linuxf20dedce0429b293d4bad604e0d3f65d8ac96c83Vendor (CNA)
Linux Linuxf27ce82eb04960465df71634b196a48a4ecafd50Vendor (CNA)
Linux Linuxfd3a3f28ed60c6af4b2a39933b151d6b27842c3bVendor (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).

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-681580 days apartlibceph: Fix multiplication overflow in decode_new_up_state_weight()
    39Monitor
  • CVE-2026-720145 days apartdrbd: reject data replies with an out-of-range payload size
    39Monitor
  • CVE-2026-6398422 days apartipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
    39Monitor
  • CVE-2025-68794209 days apartiomap: adjust read range correctly for non-block-aligned positions
    39Monitor
  • CVE-2026-681080 days apartdrm/amdgpu/vce: fix integer overflow in image size
    35Monitor
  • CVE-2026-645984 days apartsmb/client: Fix error code in smb2_aead_req_alloc()
    35Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

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

Technical details

Attack conditions

  • Someone on the same network segment 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
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

CVSS:3.1/AV:A/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.

ATT&CK techniques

—

References

Show all references (7 more)

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

All records