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NVD / CVE Program· CNA Linux

CVE-2026-89524: wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets

Noroxi assessment

Priority: Monitor (action score 32/100)

  • 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: 0.27% (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 225587bdbf4b0eb5265a71ee4dc183561a1857fc, 3bbd05723d15dd06f0560bcd94fbf9a91b5f5613, 6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 225587bdbf4b0eb5265a71ee4dc183561a1857fc, 3bbd05723d15dd06f0560bcd94fbf9a91b5f5613, 6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9 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: clamp assoc request/response lengths before subtracting IE offsets ath6kl_cfg80211_connect_event() subtracts fixed IE offsets from assoc_req_len (-= 4) and assoc_resp_len (-= 6), both u8, with no lower bound. The aggregate check recently added to ath6kl_wmi_connect_event_rx() bounds the declared lengths from above (their sum must fit the received event), but an assoc request/response shorter than its fixed offset still underflows here: the u8 wraps to ~250, and cfg80211_connect_result() / cfg80211_roamed() then treat that wrapped value as the IE length and copy that many bytes out of the small assoc_info buffer to user space via nl80211, disclosing adjacent slab memory. Clamp both lengths to their offsets before subtracting. Found by 0sec (https://0sec.ai) using automated source analysis; the missing lower bound is evident from source. Compile-tested.

HighCVSS 8.1 · v3.1—No exploit Fix available
Published
Sep 11, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 19th percentile
CWE
—

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 · 0.2%

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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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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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 225587bdbf4b0eb5265a71ee4dc183561a1857fcaffected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before d337213a889705a69735079606d0b4c672b17605affected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before e11d5ae96d5e52cb48fa27c6ad352d766d0322fbaffected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before 6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9affected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before e3619bed5da125713b29ac881dc66f5e06606f88affected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before e1330d719c047c4d8190a16be034b29fc601a815affected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before 8eb73016fb3968cf2db3987a92764563a3af773aaffected · git
    • bdcd81707973cf8aa9305337166f8ee842a050d4 and later · before 3bbd05723d15dd06f0560bcd94fbf9a91b5f5613affected · 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 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

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-2026-89522Sep 11, 2026 · media: staging/ipu7: fix async notifier UAF on probe error path
    31Monitor
  • ← EarlierCVE-2026-89523Sep 11, 2026 · wifi: mt76: mt7925: cancel pending mlo_pm_work
    31Monitor
  • Later →CVE-2026-89525Sep 11, 2026 · udf: reject VAT indexes equal to the entry count
    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 / packageFixed versionSource
Linux Linux225587bdbf4b0eb5265a71ee4dc183561a1857fcVendor (CNA)
Linux Linux3bbd05723d15dd06f0560bcd94fbf9a91b5f5613Vendor (CNA)
Linux Linux6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9Vendor (CNA)
Linux Linux8eb73016fb3968cf2db3987a92764563a3af773aVendor (CNA)
Linux Linuxd337213a889705a69735079606d0b4c672b17605Vendor (CNA)
Linux Linuxe11d5ae96d5e52cb48fa27c6ad352d766d0322fbVendor (CNA)
Linux Linuxe1330d719c047c4d8190a16be034b29fc601a815Vendor (CNA)
Linux Linuxe3619bed5da125713b29ac881dc66f5e06606f88Vendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~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.

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).

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
none
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
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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