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NVD / CVE Program· CNA Linux

CVE-2026-64568: wifi: mac80211: fix unsol_bcast_probe_resp double free on alloc failure

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0ace76e410d7f7d813b605825a3e593a79c3958f, 1d067abcd37062426c59ec73dbc4e87a63f33fea, ca27a81cd77b698e5eb586a011bee6800c7ee4bd.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0ace76e410d7f7d813b605825a3e593a79c3958f, 1d067abcd37062426c59ec73dbc4e87a63f33fea, ca27a81cd77b698e5eb586a011bee6800c7ee4bd 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: fix unsol_bcast_probe_resp double free on alloc failure ieee80211_set_unsol_bcast_probe_resp() calls kfree_rcu() on the old template before allocating the replacement. If the kzalloc() then fails, it returns -ENOMEM while link->u.ap.unsol_bcast_probe_resp still points at the object already queued for freeing. A later update or AP teardown re-queues that same rcu_head; the second free is caught by KASAN when the RCU sheaf is processed in softirq: BUG: KASAN: double-free in rcu_free_sheaf (mm/slub.c:5850) Free of addr ffff88800d06f300 by task exploit/145 ... __rcu_free_sheaf_prepare (mm/slub.c:2634 mm/slub.c:2940) rcu_free_sheaf (mm/slub.c:5850) rcu_core (kernel/rcu/tree.c:2617 kernel/rcu/tree.c:2869) handle_softirqs (kernel/softirq.c:622) The buggy address belongs to the cache kmalloc-128 of size 128 Queue the old object for kfree_rcu() only after the new one is published, matching ieee80211_set_probe_resp() and ieee80211_set_s1g_short_beacon().

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 5, 2026
Updated
Nov 3, 2026
EPSS
0.1% · 1th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
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.

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  • 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

    • 6.7affected
    • 3b1c256eb4aedfc71dd97d5951ccff824b41d628 and later · before ca27a81cd77b698e5eb586a011bee6800c7ee4bdaffected · git
    • 3b1c256eb4aedfc71dd97d5951ccff824b41d628 and later · before d62b55b7c7dc62887d7fd5648fb38f0bfaef53aeaffected · git
    • 3b1c256eb4aedfc71dd97d5951ccff824b41d628 and later · before 0ace76e410d7f7d813b605825a3e593a79c3958faffected · git
    • 3b1c256eb4aedfc71dd97d5951ccff824b41d628 and later · before 1d067abcd37062426c59ec73dbc4e87a63f33feaaffected · git
    • before 6.7not affected · semver
    • 6.12.101 and later · up to and including 6.12.*not affected · semver
    • 6.18.42 and later · up to and including 6.18.*not affected · semver
    • 7.1.6 and later · up to and including 7.1.*not affected · semver
    • 7.2 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linux-6.12before 6.12.101-1~deb12u16.12.101-1~deb12u1
Debian:13linuxbefore 6.12.101-16.12.101-1
Debian:14linuxbefore 7.1.6-17.1.6-1
SUSE:Linux Micro 6.0kernel-defaultbefore 6.4.0-159998.54.16.4.0-159998.54.1
SUSE:Linux Micro 6.0kernel-default-basebefore 6.4.0-159998.54.1.159998.21.406.4.0-159998.54.1.159998.21.40
SUSE:Linux Micro 6.0kernel-kvmsmallbefore 6.4.0-159998.54.16.4.0-159998.54.1
SUSE:Linux Micro 6.0kernel-rtbefore 6.4.0-159998.54.16.4.0-159998.54.1
SUSE:Linux Micro 6.0kernel-sourcebefore 6.4.0-159998.54.16.4.0-159998.54.1
SUSE:Linux Micro 6.0kernel-source-rtbefore 6.4.0-159998.54.16.4.0-159998.54.1
SUSE:Linux Micro 6.1kernel-default-basebefore 6.4.0-159998.54.1.159998.21.396.4.0-159998.54.1.159998.21.39

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-2026-64566Aug 5, 2026 · xfrm: iptfs: propagate SKBFL_SHARED_FRAG in iptfs_skb_add_frags()
    39Monitor
  • ← EarlierCVE-2026-64567Aug 5, 2026 · btrfs: reject free space cache with more entries than pages
    31Monitor
  • Later →CVE-2026-64569Aug 5, 2026 · mpls: fix NULL deref in mpls_valid_fib_dump_req() on CONFIG_INET=n
    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 Linux0ace76e410d7f7d813b605825a3e593a79c3958fVendor (CNA)
Linux Linux1d067abcd37062426c59ec73dbc4e87a63f33feaVendor (CNA)
Linux Linuxca27a81cd77b698e5eb586a011bee6800c7ee4bdVendor (CNA)
Linux Linuxd62b55b7c7dc62887d7fd5648fb38f0bfaef53aeVendor (CNA)
debian:linux6.12.101-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package registry (OSV)
suse:kernel-default6.4.0-159998.54.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-default-base6.4.0-159998.54.1.159998.21.40 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-kvmsmall6.4.0-159998.54.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-rt6.4.0-159998.54.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-source6.4.0-159998.54.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-source-rt6.4.0-159998.54.1 · SUSE:Linux Micro 6.0Package 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).

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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

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✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

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

All records