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NVD / CVE Program· CNA Linux

CVE-2026-93803: wifi: libipw: fix key index receive bound checks

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 062840bdc9ee06169b3c371bf66711f1d7ec0bf4, 09d4a1bc3a08bb0e19bdf250b9f575cfef0bae82, 0b61c465ea62063593bc9ac186871b69e58ae991; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 062840bdc9ee06169b3c371bf66711f1d7ec0bf4, 09d4a1bc3a08bb0e19bdf250b9f575cfef0bae82, 0b61c465ea62063593bc9ac186871b69e58ae991; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: libipw: fix key index receive bound checks libipw_rx() reads skb->data[hdrlen + 3] to extract the WEP key index in both the software-decrypt key selection path and the hardware-decrypted IV/ICV strip path. In both places the existing guard only checks skb->len >= hdrlen + 3, which proves bytes up to hdrlen + 2 but not the byte at hdrlen + 3. Require hdrlen + 4 bytes before reading that item in both paths. This is a local source-boundary check only; it does not change the key index semantics.

—No exploit Fix available
Published
Sep 24, 2026
Updated
Oct 3, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • 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

    • 2.6.14affected
    • b453872c35cfcbdbf5a794737817f7d4e7b1b579 and later · before bb18262c19feb690ddde58c70e3ad04bc6fe566eaffected · git
    • b453872c35cfcbdbf5a794737817f7d4e7b1b579 and later · before 09d4a1bc3a08bb0e19bdf250b9f575cfef0bae82affected · git
    • b453872c35cfcbdbf5a794737817f7d4e7b1b579 and later · before 2836a870f612a8a6d9e390d00fa2cf6c90aa5808affected · git
    • b453872c35cfcbdbf5a794737817f7d4e7b1b579 and later · before 0b61c465ea62063593bc9ac186871b69e58ae991affected · git
    • b453872c35cfcbdbf5a794737817f7d4e7b1b579 and later · before 062840bdc9ee06169b3c371bf66711f1d7ec0bf4affected · git
    • b453872c35cfcbdbf5a794737817f7d4e7b1b579 and later · before c54b643e9a0936d038921c547736574fd7382ceaaffected · git
    • b453872c35cfcbdbf5a794737817f7d4e7b1b579 and later · before 74ed3669f26803b1761c1f55403062bea44c3466affected · git
    • before 2.6.14not affected · semver
    • 5.10.271 and later · up to and including 5.10.*not 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-2026-93801Sep 24, 2026 · smb/client: zero-initialize stack-allocated cifs_open_info_data
    28Monitor
  • ← EarlierCVE-2026-93802Sep 24, 2026 · wifi: rsi: validate beacon length before fixed buffer copy
    0Monitor
  • Later →CVE-2026-93804Sep 24, 2026 · wifi: mac80211: ibss: wait for in-flight TX on disconnect
    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 Linux062840bdc9ee06169b3c371bf66711f1d7ec0bf4Vendor (CNA)
Linux Linux09d4a1bc3a08bb0e19bdf250b9f575cfef0bae82Vendor (CNA)
Linux Linux0b61c465ea62063593bc9ac186871b69e58ae991Vendor (CNA)
Linux Linux2836a870f612a8a6d9e390d00fa2cf6c90aa5808Vendor (CNA)
Linux Linux74ed3669f26803b1761c1f55403062bea44c3466Vendor (CNA)
Linux Linuxbb18262c19feb690ddde58c70e3ad04bc6fe566eVendor (CNA)
Linux Linuxc54b643e9a0936d038921c547736574fd7382ceaVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
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).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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✗ → ✓

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References

Show all references (6 more)

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

All records