NVD / CVE Program· CNA Linux

CVE-2026-64096: batman-adv: mcast: fix use-after-free in orig_node RCU release

Noroxi assessment

Priority: Monitor (action score 35/100)

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: 0.25% (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 20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc, 70bcb678561f0fb58f33270fc73f12f3be72b878, 78a63fb2f7d5630d1c1f2859a20d4e4226863b41.

Low priority for now. Upgrade to Linux Linux 20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc, 70bcb678561f0fb58f33270fc73f12f3be72b878, 78a63fb2f7d5630d1c1f2859a20d4e4226863b41 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: batman-adv: mcast: fix use-after-free in orig_node RCU release batadv_mcast_purge_orig() removes entries from RCU-protected hlists but does not wait for an RCU grace period before returning. Concurrent RCU readers may still accesses references to those entries at the point of removal. RCU-protected readers trying to operate on entries like orig->mcast_want_all_ipv6_node will then access already freed memory. Fix this by moving batadv_mcast_purge_orig() to batadv_orig_node_release(), just before the call_rcu() invocation. This ensures RCU readers that were active at purge time have drained before the orig_node memory is reclaimed.

HighCVSS 8.8 · v3.1—No exploit Fix available

Published: Jul 19, 2026
Updated: Aug 11, 2026
EPSS: 0.2% · 17th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 35 / 40 · 8.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CNA vs NVD score

NVD: —
CNA · Linux: 8.8; 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.

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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Noroxi analysis

What does it mean in your environment?

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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.

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 kernel3.15 and later · before 5.10.258
linux linux kernel5.11 and later · before 5.15.209
linux linux kernel5.16 and later · before 6.1.175
linux linux kernel6.2 and later · before 6.6.142
linux linux kernel6.7 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
- 3.15affected
- ab49886e3da73b6b35ece21006e191910427bb30 and later · before ff3a4487ead475e27b43280b8ee3d8464fe280e1affected · git
- ab49886e3da73b6b35ece21006e191910427bb30 and later · before 78a63fb2f7d5630d1c1f2859a20d4e4226863b41affected · git
- ab49886e3da73b6b35ece21006e191910427bb30 and later · before ced48f55bac73f0822eae90509e51b42b4f646c8affected · git
- ab49886e3da73b6b35ece21006e191910427bb30 and later · before 70bcb678561f0fb58f33270fc73f12f3be72b878affected · git
- ab49886e3da73b6b35ece21006e191910427bb30 and later · before aef897c9d2dd0d9339167fb82b62beff68d076cbaffected · git
- ab49886e3da73b6b35ece21006e191910427bb30 and later · before 8a3707653ab658e082ccd992e92594e01b09a3fcaffected · git
- ab49886e3da73b6b35ece21006e191910427bb30 and later · before edfb1e094104a50f931553dc82ac59246569fd32affected · git
- ab49886e3da73b6b35ece21006e191910427bb30 and later · before 20c2d6a20ca936f5aaa6dd40f73f262ac45c87ccaffected · git
- before 3.15not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.176-1	6.1.176-1
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-2026-64094Jul 19, 2026 · batman-adv: bla: avoid NULL-ptr deref for claim via dropped interface
22Monitor
← EarlierCVE-2026-64095Jul 19, 2026 · batman-adv: bla: avoid double decrement of bla.num_requests
28Monitor
Later →CVE-2026-64099Jul 19, 2026 · drm/v3d: Fix use-after-free of CPU job query arrays on error path
31Monitor

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	20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc	Vendor (CNA)
Linux Linux	70bcb678561f0fb58f33270fc73f12f3be72b878	Vendor (CNA)
Linux Linux	78a63fb2f7d5630d1c1f2859a20d4e4226863b41	Vendor (CNA)
Linux Linux	8a3707653ab658e082ccd992e92594e01b09a3fc	Vendor (CNA)
Linux Linux	aef897c9d2dd0d9339167fb82b62beff68d076cb	Vendor (CNA)
Linux Linux	ced48f55bac73f0822eae90509e51b42b4f646c8	Vendor (CNA)
Linux Linux	edfb1e094104a50f931553dc82ac59246569fd32	Vendor (CNA)
Linux Linux	ff3a4487ead475e27b43280b8ee3d8464fe280e1	Vendor (CNA)
debian:linux	6.1.176-1 · Debian:12	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).

Technical details

Attack conditions

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.

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: Adjacent
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

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

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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

References

git.kernel.org/stable/c/20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc

Show all references (7 more)

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

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