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NVD / CVE Program· CNA Linux

CVE-2026-68199: wifi: ath6kl: fix OOB access from firmware ADDBA window size

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: 0.38% (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 44126b6994eeb28f2103b638e698f40a1244f327, 58c6c8dc2e022e1b4f3dc58725a1ca49ff470f9c, 5a65fd4722416061698b0a3277222381efbc4882; 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 44126b6994eeb28f2103b638e698f40a1244f327, 58c6c8dc2e022e1b4f3dc58725a1ca49ff470f9c, 5a65fd4722416061698b0a3277222381efbc4882; 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: wifi: ath6kl: fix OOB access from firmware ADDBA window size aggr_recv_addba_req_evt() logs a debug message when the firmware-supplied win_sz is outside [AGGR_WIN_SZ_MIN, AGGR_WIN_SZ_MAX] but does not return. The out-of-range win_sz is then used in TID_WINDOW_SZ() to compute a kzalloc size and stored in rxtid->hold_q_sz, leading to zero-size or overflowed allocations and subsequent out-of-bounds access. Clean up any previously active aggregation session for the TID first, then return early when win_sz is out of the valid range, instead of proceeding with a broken allocation size.

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Aug 10, 2026
Updated
Oct 19, 2026
EPSS
0.3% · 32th 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.

Follow CVE-2026-68199

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.

—

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

    • 3.2affected
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before c8e3ca7954d8233fbc54bd370c1827670f43c538affected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before f480d9910fcfe326db3a6281df80e83af347193eaffected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before 67bc9af4f41f2bdba20404fbd753b2a1bd6dd352affected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before d4558c140782180e2c80a7588a4af9f8675adfc4affected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before 5a65fd4722416061698b0a3277222381efbc4882affected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before 58c6c8dc2e022e1b4f3dc58725a1ca49ff470f9caffected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before cec0a487cf38ac1f9bca240ffe8a94c5014b72f2affected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before 44126b6994eeb28f2103b638e698f40a1244f327affected · git
    • before 3.2not 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-2026-68192Aug 10, 2026 · wifi: brcmfmac: make release_scratchbuffers idempotent
    35Monitor
  • ← EarlierCVE-2026-68198Aug 10, 2026 · wifi: ath6kl: fix use-after-free in aggr_reset_state()
    35Monitor
  • Later →CVE-2026-68200Aug 10, 2026 · ALSA: timer: don't re-enter an instance callback that is still running
    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 Linux44126b6994eeb28f2103b638e698f40a1244f327Vendor (CNA)
Linux Linux58c6c8dc2e022e1b4f3dc58725a1ca49ff470f9cVendor (CNA)
Linux Linux5a65fd4722416061698b0a3277222381efbc4882Vendor (CNA)
Linux Linux67bc9af4f41f2bdba20404fbd753b2a1bd6dd352Vendor (CNA)
Linux Linuxc8e3ca7954d8233fbc54bd370c1827670f43c538Vendor (CNA)
Linux Linuxcec0a487cf38ac1f9bca240ffe8a94c5014b72f2Vendor (CNA)
Linux Linuxd4558c140782180e2c80a7588a4af9f8675adfc4Vendor (CNA)
Linux Linuxf480d9910fcfe326db3a6281df80e83af347193eVendor (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-2026-681540 days apartlibceph: reject zero bucket types in crush_decode
    39Monitor
  • CVE-2026-684775 days apartipvs: fix more places with wrong ipv6 transport offsets
    39Monitor
  • CVE-2026-720655 days apartnet: mana: Validate the packet length reported by the NIC
    39Monitor
  • CVE-2026-9999966 days apartipv4: validate checksum_start before completing checksum
    37Monitor
  • CVE-2026-684543 days apartKVM: s390: pci: Fix handling of AIF enable without AISB
    35Monitor
  • CVE-2026-684705 days apartwifi: mac80211: validate extension-frame layout before RX
    35Monitor

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 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-20 · Improper Input Validation

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.

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