Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2026-80622: char: tlclk: fix use-after-free in tlclk_cleanup()

HighCVSS 7.8 · v3.1—No exploit Fix available

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: 0.17% (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 09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a, 166dd1d5265e067459e674c11688919901813ec2, 3d5e4cc0d9dce79b0429da3134ac7b072ab9009f.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a, 166dd1d5265e067459e674c11688919901813ec2, 3d5e4cc0d9dce79b0429da3134ac7b072ab9009f 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: char: tlclk: fix use-after-free in tlclk_cleanup() This patch improves the module cleanup process in the tlclk driver to prevent potential use-after-free and race conditions. Currently, the file_operations structure does not specify the .owner field, which could allow the module to be unloaded while user-space processes are still interacting with the device. Additionally, the tlclk_cleanup() function frees the alarm_events memory before ensuring that blocked processes in the waitqueue are fully awakened and that the switchover_timer has completed. To address these cases, this patch: - Sets '.owner = THIS_MODULE' in tlclk_fops to safely defer module unloading while the device is in use. - Updates tlclk_cleanup() to explicitly wake up all blocked readers (wake_up_all), properly release hardware I/O regions, and safely delete the timer (timer_delete_sync) prior to freeing memory.

Published
Aug 28, 2026
Updated
Oct 16, 2026
EPSS
0.1% · 6th 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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

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.

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.

Follow CVE-2026-80622

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Your free account also gets you

  • CVE alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records
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.

—

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

    • 2.6.15affected
    • 1a80ba88273097933f93b1f40537337416798c70 and later · before 09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0aaffected · git
    • 1a80ba88273097933f93b1f40537337416798c70 and later · before 96902299a22d126ef5eb3f45cd5d8ceea9e6a735affected · git
    • 1a80ba88273097933f93b1f40537337416798c70 and later · before 166dd1d5265e067459e674c11688919901813ec2affected · git
    • 1a80ba88273097933f93b1f40537337416798c70 and later · before 764723bd67a6c8f53a8d8309211fb039e2ebcf49affected · git
    • 1a80ba88273097933f93b1f40537337416798c70 and later · before c3f0cd76561ae611c2d247ee96dfd559e4197cb7affected · git
    • 1a80ba88273097933f93b1f40537337416798c70 and later · before 3d5e4cc0d9dce79b0429da3134ac7b072ab9009faffected · git
    • 1a80ba88273097933f93b1f40537337416798c70 and later · before 42223445607a9a5df3cb1c4729abfe3a5085e7ceaffected · git
    • 1a80ba88273097933f93b1f40537337416798c70 and later · before bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1affected · git
    • before 2.6.15not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

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-2026-80616Aug 28, 2026 · ieee802154: Avoid calling WARN_ON() on -ENOMEM in cfg802154_switch_netns()
    0Monitor
  • ← EarlierCVE-2026-80620Aug 28, 2026 · Revert "PCI/MSI: Unmap MSI-X region on error"
    0Monitor
  • Later →CVE-2026-80623Aug 28, 2026 · coresight: ete: Always save state on power down
    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 Linux09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0aVendor (CNA)
Linux Linux166dd1d5265e067459e674c11688919901813ec2Vendor (CNA)
Linux Linux3d5e4cc0d9dce79b0429da3134ac7b072ab9009fVendor (CNA)
Linux Linux42223445607a9a5df3cb1c4729abfe3a5085e7ceVendor (CNA)
Linux Linux764723bd67a6c8f53a8d8309211fb039e2ebcf49Vendor (CNA)
Linux Linux96902299a22d126ef5eb3f45cd5d8ceea9e6a735Vendor (CNA)
Linux Linuxbbf003b7794d6ad6f939fdd29f1f1bde8ac554c1Vendor (CNA)
Linux Linuxc3f0cd76561ae611c2d247ee96dfd559e4197cb7Vendor (CNA)
debian:linux6.1.180-1 · Debian:12Package 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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.

References

Show all references (7 more)

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

All records