NVD / CVE Program· CNA Linux

CVE-2026-64365: HID: letsketch: fix UAF on inrange_timer at driver unbind

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 17f5928d7010bc9e002930326b59e60e40c09ee3, 2bb6e7143cf70ed281822d26c1848b2897ac36e9, 3eca1a8165b5e7996e699e9df76cb4645e184d42.

Low priority for now. Upgrade to Linux Linux 17f5928d7010bc9e002930326b59e60e40c09ee3, 2bb6e7143cf70ed281822d26c1848b2897ac36e9, 3eca1a8165b5e7996e699e9df76cb4645e184d42 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: HID: letsketch: fix UAF on inrange_timer at driver unbind letsketch_driver does not provide a .remove callback, but letsketch_probe() arms a per-device timer: timer_setup(&data->inrange_timer, letsketch_inrange_timeout, 0); The timer is re-armed from letsketch_raw_event() with a 100 ms timeout on every pen-in-range report, and its callback dereferences data->input_tablet to deliver a synthetic BTN_TOOL_PEN release. letsketch_data is allocated with devm_kzalloc(), and its input_dev fields are devm-allocated via letsketch_setup_input_tablet(). On device unbind (USB unplug or rmmod), the HID core runs its default teardown and devm cleanup frees both letsketch_data and the input devices. Because no .remove callback exists, nothing drains the timer first: if raw_event armed it within ~100 ms of the unbind, the pending timer fires on freed memory. This is a UAF read of data and of data->input_tablet, followed by input_report_key() / input_sync() into the freed input_dev. The same problem can occur on the probe error path: if hid_hw_start() enabled I/O on an always-poll-quirk device and then failed, raw_event may have armed the timer before devm releases data. Fix by adding a .remove callback that calls hid_hw_stop() first. hid_hw_stop() synchronously kills the URBs that deliver raw_event(), so once it returns no path can re-arm the timer. timer_shutdown_sync() then drains any in-flight callback and permanently disables further mod_timer() calls. Apply the same timer_shutdown_sync() in the probe error path so the timer is guaranteed not to outlive data.

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

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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.

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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 kernel5.17 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
- 5.17affected
- 33a5c2793451770cb6dcf0cc35c76cfd4b045513 and later · before 2bb6e7143cf70ed281822d26c1848b2897ac36e9affected · git
- 33a5c2793451770cb6dcf0cc35c76cfd4b045513 and later · before 523db788c0f84612707638e266e8957ca7e3a756affected · git
- 33a5c2793451770cb6dcf0cc35c76cfd4b045513 and later · before 17f5928d7010bc9e002930326b59e60e40c09ee3affected · git
- 33a5c2793451770cb6dcf0cc35c76cfd4b045513 and later · before 3eca1a8165b5e7996e699e9df76cb4645e184d42affected · git
- 33a5c2793451770cb6dcf0cc35c76cfd4b045513 and later · before df3d8aa1a9392da3de66398e7a03422463806b21affected · git
- 33a5c2793451770cb6dcf0cc35c76cfd4b045513 and later · before 46c8beeccd8ab2c863827254a85ea877654a3534affected · git
- before 5.17not affected · semver
- 6.1.178 and later · up to and including 6.1.*not affected · semver
- 6.6.145 and later · up to and including 6.6.*not 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

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Published before and after this one in the same product

← EarlierCVE-2026-64363Jul 25, 2026 · HID: appleir: fix UAF on pending key_up_timer in remove()
31Monitor
← EarlierCVE-2026-64364Jul 25, 2026 · HID: multitouch: fix out-of-bounds bit access on mt_io_flags
35Monitor
Later →CVE-2026-64366Jul 25, 2026 · HID: wacom: fix slab-out-of-bounds write in wacom_wac_queue_insert
35Monitor

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	17f5928d7010bc9e002930326b59e60e40c09ee3	Vendor (CNA)
Linux Linux	2bb6e7143cf70ed281822d26c1848b2897ac36e9	Vendor (CNA)
Linux Linux	3eca1a8165b5e7996e699e9df76cb4645e184d42	Vendor (CNA)
Linux Linux	46c8beeccd8ab2c863827254a85ea877654a3534	Vendor (CNA)
Linux Linux	523db788c0f84612707638e266e8957ca7e3a756	Vendor (CNA)
Linux Linux	df3d8aa1a9392da3de66398e7a03422463806b21	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, 10:11 PM UTC

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

References

git.kernel.org/stable/c/17f5928d7010bc9e002930326b59e60e40c09ee3

Show all references (5 more)

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

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