NVD / CVE Program· CNA Linux

CVE-2026-64223: wifi: mac80211: consume only present negotiated TTLM maps

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: 0.38% (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 2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78f, 2dd9304727c7041df0a599595910bdbe02ad03c5, a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95ea.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78f, 2dd9304727c7041df0a599595910bdbe02ad03c5, a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95ea 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: consume only present negotiated TTLM maps ieee80211_tid_to_link_map_size_ok() validates negotiated TTLM elements against the number of link-map entries indicated by link_map_presence. ieee80211_parse_neg_ttlm() must consume the same layout. The parser advanced its cursor for every TID, including TIDs whose presence bit is clear and therefore have no map bytes in the element. A sparse map can then make a later present TID read past the validated element. The bad bytes land in neg_ttlm->{up,down}link[tid] but are gated by valid_links before being applied to driver state, so a peer cannot turn the read into a policy change. Under KUnit + KASAN with an exact-sized element allocation the OOB read is reported as a slab-out-of-bounds; whether the same trigger fires under the production RX path depends on surrounding allocator state. Advance the cursor only when the current TID has a map present.

HighCVSS 8.1 · v3.1—No exploit Fix available

Published: Jul 24, 2026
Updated: Oct 19, 2026
EPSS: 0.3% · 32th percentile
CWE: CWE-125

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 32 / 40 · 8.1 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

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.

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

If any of these changes, we'll tell you in the daily email digest.

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel6.9 and later · before 6.12.92
linux linux kernel6.13 and later · before 6.18.34
linux linux kernel6.19 and later · before 7.0.11
linux linux kernel7.1

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
- 6.9affected
- 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 and later · before f7d395dc5008168ac5b9c1ac2791e59a6078cca1affected · git
- 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 and later · before 2dd9304727c7041df0a599595910bdbe02ad03c5affected · git
- 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 and later · before 2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78faffected · git
- 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 and later · before a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95eaaffected · git
- before 6.9not affected · semver
- 6.12.92 and later · up to and including 6.12.*not affected · semver
- 6.18.34 and later · up to and including 6.18.*not affected · semver
- 7.0.11 and later · up to and including 7.0.*not affected · semver
- 7.1 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:13	linux	before 6.12.94-1	6.12.94-1
Debian:14	linux	before 7.0.12-1	7.0.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2026-64219Jul 24, 2026 · drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async
28Monitor
← EarlierCVE-2026-64222Jul 24, 2026 · octeontx2-pf: avoid double free of pool->stack on AQ init failure
28Monitor
Later →CVE-2026-64232Jul 24, 2026 · block: recompute nr_integrity_segments in blk_insert_cloned_request
39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78f	Vendor (CNA)
Linux Linux	2dd9304727c7041df0a599595910bdbe02ad03c5	Vendor (CNA)
Linux Linux	a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95ea	Vendor (CNA)
Linux Linux	f7d395dc5008168ac5b9c1ac2791e59a6078cca1	Vendor (CNA)
debian:linux	6.12.94-1 · Debian:13	Package 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).