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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98422: wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown

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: 0.22% (FIRST EPSS).
  • Fixed version: Linux Linux 304a874670a0b6ab5589a7f60b4af0251797b121, 3d76b45e8432c0d75fcb9e90d92eaa3176898adf, 4504f3960dc4501c73be9f99eabda2e26e9db41e; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 304a874670a0b6ab5589a7f60b4af0251797b121, 3d76b45e8432c0d75fcb9e90d92eaa3176898adf, 4504f3960dc4501c73be9f99eabda2e26e9db41e; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1 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: mac80211: reset the AP_VLAN tailroom counter on ifdown On ifup, AP_VLAN interfaces get crypto_tx_tailroom_needed_cnt from the AP interface, but it's never decremented again unless the AP is also brought down. Thus, bringing the same AP_VLAN up again will increment the counter again and eventually hit the sanity check: WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != master->crypto_tx_tailroom_needed_cnt); Reset it on ifdown to avoid that.

—No exploit Fix available
Published
Oct 14, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th 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 · 0.2%

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

  • when it enters CISA KEV
  • 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

    • 4.1affected
    • f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and later · before b0b32d3f163d24ea7134380666193bf398e9dc0baffected · git
    • f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and later · before f6b34a7d64324faf28eedc0f8678b0f832f1cc36affected · git
    • f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and later · before 304a874670a0b6ab5589a7f60b4af0251797b121affected · git
    • f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and later · before 7775759e3cb35ef5a571b2d877c2a9b70a5d5f08affected · git
    • f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and later · before 3d76b45e8432c0d75fcb9e90d92eaa3176898adfaffected · git
    • f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and later · before 4b54d01b48445b66c9e576de92b90a3a3ae7b34aaffected · git
    • f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and later · before 875835377d8d62c849b4eb03a7abfafa71d7668faffected · git
    • f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and later · before 4504f3960dc4501c73be9f99eabda2e26e9db41eaffected · git
    • before 4.1not 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 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.8-17.2.8-1
openSUSE:Tumbleweedkernel-sourcebefore 7.2.11-1.17.2.11-1.1

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-2026-98420Oct 14, 2026 · ksmbd: follow SMB2 session expiration semantics
    0Monitor
  • ← EarlierCVE-2026-98421Oct 14, 2026 · wifi: mac80211: require a peer station for TDLS setup confirm
    0Monitor
  • Later →CVE-2026-98423Oct 14, 2026 · wifi: mac80211_hwsim: don't hand frames to mac80211 while stopping
    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 Linux304a874670a0b6ab5589a7f60b4af0251797b121Vendor (CNA)
Linux Linux3d76b45e8432c0d75fcb9e90d92eaa3176898adfVendor (CNA)
Linux Linux4504f3960dc4501c73be9f99eabda2e26e9db41eVendor (CNA)
Linux Linux4b54d01b48445b66c9e576de92b90a3a3ae7b34aVendor (CNA)
Linux Linux7775759e3cb35ef5a571b2d877c2a9b70a5d5f08Vendor (CNA)
Linux Linux875835377d8d62c849b4eb03a7abfafa71d7668fVendor (CNA)
Linux Linuxb0b32d3f163d24ea7134380666193bf398e9dc0bVendor (CNA)
Linux Linuxf6b34a7d64324faf28eedc0f8678b0f832f1cc36Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.159.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.8-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:kernel-source7.2.11-1.1 · openSUSE:TumbleweedPackage 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.

  1. Published
  2. Fix recordedsame day
  3. TodayOct 30, 2026+16 d
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

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. Exploit maturity— → 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.

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