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NVD / CVE Program· CNA Linux

CVE-2026-93149: wifi: mac80211_hwsim: avoid NULL skb in stop queue drain

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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 158438cd6ad69d6dd7d871582c38baf22169fede, 1c2a4ab6efa26415dd131b8c222e7893fda03435, 2817431a61557f46dc63077b7cc126bc906c242e; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 158438cd6ad69d6dd7d871582c38baf22169fede, 1c2a4ab6efa26415dd131b8c222e7893fda03435, 2817431a61557f46dc63077b7cc126bc906c242e; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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_hwsim: avoid NULL skb in stop queue drain mac80211_hwsim_stop() drops any frames left in data->pending. The loop currently checks skb_queue_empty() and then dequeues separately. That split is racy with TX status handling, which can remove a pending frame under the queue lock. If the last entry is removed after the empty check, skb_dequeue() returns NULL and the stop path passes that NULL skb to ieee80211_free_txskb(). Use skb_dequeue() as the loop condition instead. The dequeue result is the object that stop owns and frees, and a concurrent status completion that empties the queue simply makes the loop terminate.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 10th 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 exploit code appears or is weaponized
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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

    • 78bf3c6131488b00386acd9aff1ea4e6c44fa38e, a9028333001f793b2724e8be42fce3336de2cf1c, 7019c9f385b264a2d6f685028268422d55087e37, 5.13affected
    • bd18de517923903a177508fc8813f44e717b1c00 and later · before d131027054a8dd922dda01fe8d381abe5af4970baffected · git
    • bd18de517923903a177508fc8813f44e717b1c00 and later · before c40ba47f2ba1951cb32ea048667ed014d36a5749affected · git
    • bd18de517923903a177508fc8813f44e717b1c00 and later · before 2817431a61557f46dc63077b7cc126bc906c242eaffected · git
    • bd18de517923903a177508fc8813f44e717b1c00 and later · before e7fccad2c8e6ef6bbafe509c95869d161d0f466baffected · git
    • bd18de517923903a177508fc8813f44e717b1c00 and later · before 1c2a4ab6efa26415dd131b8c222e7893fda03435affected · git
    • bd18de517923903a177508fc8813f44e717b1c00 and later · before 158438cd6ad69d6dd7d871582c38baf22169fedeaffected · git
    • 5.4.129 and later · before 5.5affected · semver
    • 5.10.47 and later · before 5.11affected · semver
    • 5.12.14 and later · before 5.13affected · 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-2026-93147Sep 17, 2026 · s390/bpf: Replace ly instruction with llgf
    31Monitor
  • ← EarlierCVE-2026-93148Sep 17, 2026 · bpf: Reject MEM_ALLOC BTF accesses past object bounds
    31Monitor
  • Later →CVE-2026-93150Sep 17, 2026 · cgroup/cpuset: Make nr_deadline_tasks an atomic_t
    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 Linux158438cd6ad69d6dd7d871582c38baf22169fedeVendor (CNA)
Linux Linux1c2a4ab6efa26415dd131b8c222e7893fda03435Vendor (CNA)
Linux Linux2817431a61557f46dc63077b7cc126bc906c242eVendor (CNA)
Linux Linux5.11Vendor (CNA)
Linux Linux5.13Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linuxc40ba47f2ba1951cb32ea048667ed014d36a5749Vendor (CNA)
Linux Linuxd131027054a8dd922dda01fe8d381abe5af4970bVendor (CNA)
Linux Linuxe7fccad2c8e6ef6bbafe509c95869d161d0f466bVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · 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 (5 more)

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

All records