NVD / CVE Program· CNA Linux

CVE-2026-64452: 6lowpan: fix NHC entry use-after-free on error path

Noroxi assessment

Priority: Monitor (action score 28/100)

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).
Someone on the same network segment can trigger it. No account or password is required. A user must open a link or visit a page. Special conditions such as timing or configuration are required.
Fixed version: Linux Linux 0beccbcf50de125be5520d0ffc59af4bb8655482, 1720db928e5a58ca7d75ac1d514c3b73fd7061a7, 593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1.

Low priority for now. Upgrade to Linux Linux 0beccbcf50de125be5520d0ffc59af4bb8655482, 1720db928e5a58ca7d75ac1d514c3b73fd7061a7, 593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1 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: 6lowpan: fix NHC entry use-after-free on error path lowpan_nhc_do_uncompression() looks up an NHC descriptor while holding lowpan_nhc_lock. If the descriptor has no uncompress callback, the error path drops the lock before printing nhc->name. lowpan_nhc_del() removes descriptors under the same lock and then relies on synchronize_net() before the owning module can be unloaded. That only waits for net RX RCU readers. lowpan_header_decompress() is also exported and can be reached from callers that are not necessarily covered by the net core RX critical section, for example the Bluetooth 6LoWPAN L2CAP receive path. This leaves a race where one task drops lowpan_nhc_lock in the error path, another task unregisters and frees the matching descriptor after synchronize_net() returns, and the first task then dereferences nhc->name for the warning. With the post-unlock window widened, KASAN reports: BUG: KASAN: slab-use-after-free in lowpan_nhc_do_uncompression+0x1f4/0x220 Read of size 8 lowpan_nhc_do_uncompression lowpan_header_decompress Fix this by printing the warning before dropping lowpan_nhc_lock, so the descriptor name is read while unregister is still excluded. The malformed packet is still rejected with -ENOTSUPP.

HighCVSS 7.1 · v3.1—No exploit Fix available

Published: Jul 25, 2026
Updated: Oct 19, 2026
EPSS: 0.2% · 12th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 28 / 40 · 7.1 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 7.1; 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

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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.

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 kernel4.1 and later · before 5.10.261
linux linux kernel5.11 and later · before 5.15.212
linux linux kernel5.16 and later · before 6.1.178
linux linux kernel6.2 and later · before 6.6.145
linux linux kernel6.7 and later · before 6.12.96
linux linux kernel6.13 and later · before 6.18.39
linux linux kernel6.19 and later · before 7.1.4

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
- 92aa7c65d295f3cbb96904afe335f683e55584b8 and later · before 9c2f5c0829a8c8b904dae36be6d8056b719ac605affected · git
- 92aa7c65d295f3cbb96904afe335f683e55584b8 and later · before 80b5c8779acee0550845394fb3e5176a398aa24caffected · git
- 92aa7c65d295f3cbb96904afe335f683e55584b8 and later · before cc27aea4d454abfb385ee2c9499c78b96db9b728affected · git
- 92aa7c65d295f3cbb96904afe335f683e55584b8 and later · before a8e3a94711134e898c6021a6b77374efa91b3639affected · git
- 92aa7c65d295f3cbb96904afe335f683e55584b8 and later · before 593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168affected · git
- 92aa7c65d295f3cbb96904afe335f683e55584b8 and later · before 0beccbcf50de125be5520d0ffc59af4bb8655482affected · git
- 92aa7c65d295f3cbb96904afe335f683e55584b8 and later · before b713aa0cc344f10f7a9928a230b5f5e780d04078affected · git
- 92aa7c65d295f3cbb96904afe335f683e55584b8 and later · before 1720db928e5a58ca7d75ac1d514c3b73fd7061a7affected · git
- before 4.1not 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 6.1.180-1	6.1.180-1
Debian:12	linux-6.12	before 6.12.100-1~deb12u1	6.12.100-1~deb12u1
Debian:13	linux	before 6.12.96-1	6.12.96-1
Debian:14	linux	before 7.1.4-1	7.1.4-1

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-2026-64448Jul 25, 2026 · smb: client: restrict implied bcc[0] exemption to responses without data area
32Monitor
← EarlierCVE-2026-64450Jul 25, 2026 · tipc: fix out-of-bounds read in broadcast Gap ACK blocks
36Monitor
Later →CVE-2026-17523Jul 27, 2026 · can: bcm: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet
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	0beccbcf50de125be5520d0ffc59af4bb8655482	Vendor (CNA)
Linux Linux	1720db928e5a58ca7d75ac1d514c3b73fd7061a7	Vendor (CNA)
Linux Linux	593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168	Vendor (CNA)
Linux Linux	80b5c8779acee0550845394fb3e5176a398aa24c	Vendor (CNA)
Linux Linux	9c2f5c0829a8c8b904dae36be6d8056b719ac605	Vendor (CNA)
Linux Linux	a8e3a94711134e898c6021a6b77374efa91b3639	Vendor (CNA)
Linux Linux	b713aa0cc344f10f7a9928a230b5f5e780d04078	Vendor (CNA)
Linux Linux	cc27aea4d454abfb385ee2c9499c78b96db9b728	Vendor (CNA)
azl3 kernel 6.6.144.1-1 on Azure Linux 3.0	6.6.145.2-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.180-1 · Debian:12	Package registry (OSV)
debian:linux-6.12	6.12.100-1~deb12u1 · 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.
A user must open a link or visit a page.
Special conditions such as timing or configuration are required.

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: High
Privileges required: None
User interaction: Required
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:H/PR:N/UI:R/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

SSVC exploitation— → noneOct 16, 2026, 5:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

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

References

git.kernel.org/stable/c/0beccbcf50de125be5520d0ffc59af4bb8655482

Show all references (7 more)

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

All records