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NVD / CVE Program· CNA Linux

CVE-2026-90334: tty: clear cdev pointer after cdev_add() failure

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 33a44333a9dfda044b0e233399b12ead7f8a90ae, 4f6bd79bb7e55095f09bec9b4eb6c09df1306116, 5c5a795bf6248fe96f96dd9fd79d66bbb4a92077; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 33a44333a9dfda044b0e233399b12ead7f8a90ae, 4f6bd79bb7e55095f09bec9b4eb6c09df1306116, 5c5a795bf6248fe96f96dd9fd79d66bbb4a92077; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: tty: clear cdev pointer after cdev_add() failure tty_cdev_add() drops the cdev reference when cdev_add() fails, but leaves driver->cdevs[index] pointing to freed memory. tty_unregister_device() later passes that stale pointer to cdev_del(), causing a use-after-free. Clear the slot after dropping the reference.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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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.

—

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

    • 4.3affected
    • c1a752ba2d6b8a52879c7ab637cff38359ea9827 and later · before fb1de260033c215dba438973d82b48562bdc86bbaffected · git
    • c1a752ba2d6b8a52879c7ab637cff38359ea9827 and later · before e9e64dd02fd68776afda00777591eca0c3984285affected · git
    • c1a752ba2d6b8a52879c7ab637cff38359ea9827 and later · before 33a44333a9dfda044b0e233399b12ead7f8a90aeaffected · git
    • c1a752ba2d6b8a52879c7ab637cff38359ea9827 and later · before d331c63570af61ef7aaf516b64a8d6f47518a3a4affected · git
    • c1a752ba2d6b8a52879c7ab637cff38359ea9827 and later · before a83fcddf3c75d004f12aa13555bb73da19fb75a9affected · git
    • c1a752ba2d6b8a52879c7ab637cff38359ea9827 and later · before 4f6bd79bb7e55095f09bec9b4eb6c09df1306116affected · git
    • c1a752ba2d6b8a52879c7ab637cff38359ea9827 and later · before 5c5a795bf6248fe96f96dd9fd79d66bbb4a92077affected · git
    • c1a752ba2d6b8a52879c7ab637cff38359ea9827 and later · before 6645856f0df3aeecd45519cb611415b4b89c2223affected · git
    • before 4.3not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

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-2026-90332Sep 17, 2026 · PCI: dwc: ep: Flush cached MSI write before unmapping the iATU
    32Monitor
  • ← EarlierCVE-2026-90333Sep 17, 2026 · dm-integrity: replace forgeable discard filler with a keyed sector marker
    0Monitor
  • Later →CVE-2026-90335Sep 17, 2026 · tty: skip cdev_del() when no cdev is registered
    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 Linux33a44333a9dfda044b0e233399b12ead7f8a90aeVendor (CNA)
Linux Linux4f6bd79bb7e55095f09bec9b4eb6c09df1306116Vendor (CNA)
Linux Linux5c5a795bf6248fe96f96dd9fd79d66bbb4a92077Vendor (CNA)
Linux Linux6645856f0df3aeecd45519cb611415b4b89c2223Vendor (CNA)
Linux Linuxa83fcddf3c75d004f12aa13555bb73da19fb75a9Vendor (CNA)
Linux Linuxd331c63570af61ef7aaf516b64a8d6f47518a3a4Vendor (CNA)
Linux Linuxe9e64dd02fd68776afda00777591eca0c3984285Vendor (CNA)
Linux Linuxfb1de260033c215dba438973d82b48562bdc86bbVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · 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).

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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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

  1. Fix✗ → ✓

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References

Show all references (7 more)

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

All records