NVD / CVE Program· CNA Linux

CVE-2026-64329: usb: typec: ucsi: ccg: Fix use-after-free of ucsi on remove

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 1a160076d3d0dcd4a98a4599ad96eec0790b099b, 1f0bdc2884b67de337215079bba166df0cdf4ac5, 86c9ee928c4a370e323e432aaf8dca79c4ba7c85.

Low priority for now. Upgrade to Linux Linux 1a160076d3d0dcd4a98a4599ad96eec0790b099b, 1f0bdc2884b67de337215079bba166df0cdf4ac5, 86c9ee928c4a370e323e432aaf8dca79c4ba7c85 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: usb: typec: ucsi: ccg: Fix use-after-free of ucsi on remove The threaded IRQ handler ccg_irq_handler() calls ucsi_notify_common(), which on a connector-change event calls ucsi_connector_change() and schedules connector work. In ucsi_ccg_remove(), ucsi_destroy() frees uc->ucsi (kfree) before free_irq() is called, so a handler invocation already in flight may access the freed object after ucsi_destroy(). CPU 0 (remove) | CPU 1 (threaded IRQ) ucsi_destroy(uc->ucsi) | ccg_irq_handler() kfree(ucsi) // FREE | ucsi_notify_common(uc->ucsi) // USE Move free_irq() before ucsi_destroy() in the remove path. It is kept after ucsi_unregister(): ucsi_unregister() cancels connector work whose handler issues GET_CONNECTOR_STATUS through ucsi_send_command_common(), which waits for a completion that is signalled from the IRQ handler, so the IRQ must stay active until that work has been cancelled. The probe error path already orders free_irq() before ucsi_destroy(). This bug was found by static analysis.

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: Jul 25, 2026
Updated: Nov 6, 2026
EPSS: 0.1% · 2th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

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

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

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 kernel5.5 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
linux linux kernel7.2

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
- 5.5affected
- e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 and later · before f1adeb1ff8bef1467d6961059810795d02bbad5daffected · git
- e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 and later · before 99381e762273a2410a3f0216000be32b013c0ea9affected · git
- e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 and later · before 1a160076d3d0dcd4a98a4599ad96eec0790b099baffected · git
- e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 and later · before c32df11147822d22facee8fa30c2e8971d12f426affected · git
- e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 and later · before 86c9ee928c4a370e323e432aaf8dca79c4ba7c85affected · git
- e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 and later · before f5c772b76bbd95de8be51cf849c6098f6af6fcf9affected · git
- e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 and later · before dbb500bad02146b388041877574829016591ddc8affected · git
- e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 and later · before 1f0bdc2884b67de337215079bba166df0cdf4ac5affected · git
- before 5.5not 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-2026-64325Jul 25, 2026 · wifi: mt76: mt7921/mt7925: fix NULL dereference in CSA beacon
22Monitor
← EarlierCVE-2026-64326Jul 25, 2026 · block: skip sync_blockdev() on surprise removal in bdev_mark_dead()
22Monitor
Later →CVE-2026-64330Jul 25, 2026 · usb: typec: tcpm: Validate SVID index in svdm_consume_modes()
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	1a160076d3d0dcd4a98a4599ad96eec0790b099b	Vendor (CNA)
Linux Linux	1f0bdc2884b67de337215079bba166df0cdf4ac5	Vendor (CNA)
Linux Linux	86c9ee928c4a370e323e432aaf8dca79c4ba7c85	Vendor (CNA)
Linux Linux	99381e762273a2410a3f0216000be32b013c0ea9	Vendor (CNA)
Linux Linux	c32df11147822d22facee8fa30c2e8971d12f426	Vendor (CNA)
Linux Linux	dbb500bad02146b388041877574829016591ddc8	Vendor (CNA)
Linux Linux	f1adeb1ff8bef1467d6961059810795d02bbad5d	Vendor (CNA)
Linux Linux	f5c772b76bbd95de8be51cf849c6098f6af6fcf9	Vendor (CNA)
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 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)

CWE-416 · Use After Free

CVSS vector

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

nvd-primary

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— → noneNov 6, 2026, 6:07 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/1a160076d3d0dcd4a98a4599ad96eec0790b099b

Show all references (7 more)

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

All records