Unknown

CVE-2026-98186 — wifi: mwifiex: bound the pairwise-cipher OUI walk to the IE length

In the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: bound the pairwise-cipher OUI walk to the IE length mwifiex_search_oui_in_ie() reads a pairwise-cipher (PTK) count from a beacon/probe-response RSN or WPA information element and then walks that many 4-byte OUIs, comparing each with memcmp(). The count comes straight from the (attacker-supplied) IE and is never checked against the element's own length, and the callers admit the element on element_id alone (has_ieee_hdr() / has_vendor_hdr(), no length check). A crafted RSN/WPA IE with a large pairwise count therefore makes the walk read up to 255 * 4 bytes past the element -- an out-of-bounds read of the kmemdup()'d beacon buffer, reachable from any AP whose beacon/probe response is processed during scan-result parsing. Pass the number of IE bytes available at the OUI list and bound the walk to the element. Keep the length signed and reject a negative value before any unsigned arithmetic, so a small or zero IE length cannot underflow to a large size_t and defeat the bound. Found by 0sec automated security-research tooling (https://0sec.ai).

Published Oct 6, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.18%

ahead of 7% of scored CVEs · Oct 14, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e and < 77e642af7f2f6029e12a35c847c56cbd0466e799≥ 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e and < 982b8fcdbb28f63bbbf02f0822c0bbda12ec27ed≥ 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e and < 58767b41f87244eebaa5a475b9d276c83b89b933≥ 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e and < 2402c9e2644b7e10c7aaaf87bf12743d7e363559≥ 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e and < 54a9cc5bd70b0d77a5069d4c46998c679a10c857≥ 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e and < 8bbef2b1ebfbadc0b9c37bbbf9c9e26fe2e41960≥ 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e and < 46cda9d42f0d6ec3057d878ddb1f38c0ab9f51df≥ 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e and < e667aee1c192d67d27c803007bfa9c6e0873e959 and 1 more version 3.0	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.18%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 13, 2026
Affected products added · linux/linux
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
Oct 6, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

8 on the record

git.kernel.org/stable/c/54a9cc5bd70b0d77a5069d4c46998c679a10c857
NIST National Vulnerability Database
git.kernel.org/stable/c/46cda9d42f0d6ec3057d878ddb1f38c0ab9f51df
NIST National Vulnerability Database
git.kernel.org/stable/c/2402c9e2644b7e10c7aaaf87bf12743d7e363559
NIST National Vulnerability Database
git.kernel.org/stable/c/58767b41f87244eebaa5a475b9d276c83b89b933
NIST National Vulnerability Database
git.kernel.org/stable/c/e667aee1c192d67d27c803007bfa9c6e0873e959
NIST National Vulnerability Database
git.kernel.org/stable/c/8bbef2b1ebfbadc0b9c37bbbf9c9e26fe2e41960
NIST National Vulnerability Database
git.kernel.org/stable/c/982b8fcdbb28f63bbbf02f0822c0bbda12ec27ed
NIST National Vulnerability Database
git.kernel.org/stable/c/77e642af7f2f6029e12a35c847c56cbd0466e799
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 9h
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 9h
Unknown CVE-2026-98431 RDMA/uverbs: Fix mmap_lock/disassociation_lock circular dependency 1d
Unknown CVE-2026-98430 RDMA/efa: Keep admin queues alive while IRQ is registered 1d
Unknown CVE-2026-98429 RDMA/efa: Keep EQ resources alive while IRQ is registered 1d
Unknown CVE-2026-98428 ALSA: usb: 6fire: Avoid embedded URBs 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-98186 is "wifi: mwifiex: bound the pairwise-cipher OUI walk to the IE length", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.18% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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