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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98753: tty: tty_port: restore TTY_IO_ERROR on activation 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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 16032c980d8f71642fcdc99309c571df3fcf3328, 34d4f67472ef7a744970b772a8565ddc727788e2, 5469dc4153a60289c5bae00215947c6ce09fcc0e; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 16032c980d8f71642fcdc99309c571df3fcf3328, 34d4f67472ef7a744970b772a8565ddc727788e2, 5469dc4153a60289c5bae00215947c6ce09fcc0e; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 Release Notes 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: tty_port: restore TTY_IO_ERROR on activation failure Make sure to restore the TTY_IO_ERROR flag if activation fails to prevent I/O attempts on a port that is gone or powered down. This specifically avoids issues like kernel panic due to unclocked accesses or NULL-pointer dereferences when accessing powered down or deregistered ports when a TTY ioctl races with hangup and open. Note that the flag is set again in tty_port_close() but not restoring it on activation failure leaves a window where drivers fail to handle the ioctl-hangup race.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 7th 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 · 0.1%

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

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  • 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

    • 2.6.33affected
    • a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 and later · before 761e8c5eb13d1b5e196b0b39bdfed6fc67af9dd2affected · git
    • a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 and later · before 5469dc4153a60289c5bae00215947c6ce09fcc0eaffected · git
    • a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 and later · before e24625bff786fa3f22cc38b5038362b910621e83affected · git
    • a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 and later · before 16032c980d8f71642fcdc99309c571df3fcf3328affected · git
    • a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 and later · before 34d4f67472ef7a744970b772a8565ddc727788e2affected · git
    • a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 and later · before 7021acc84c2e0add77a1a33152e3a1e428fdbfdbaffected · git
    • a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 and later · before 6388409b711eb91b14fa075a4d861ccc4df1cfe7affected · git
    • a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 and later · before 56964f6a31238fb41d5830bb42520c5b10ff7d8faffected · git
    • before 2.6.33not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.10-17.2.10-1

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-2026-98751Oct 18, 2026 · tty: abort break signalling on hangup
    0Monitor
  • ← EarlierCVE-2026-98752Oct 18, 2026 · tty: port: fix tty_port_tty_vhangup() race
    0Monitor
  • Later →CVE-2026-98754Oct 18, 2026 · tty: vcc: hold port lock when clearing tty pointer in vcc_cleanup
    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 Linux16032c980d8f71642fcdc99309c571df3fcf3328Vendor (CNA)
Linux Linux34d4f67472ef7a744970b772a8565ddc727788e2Vendor (CNA)
Linux Linux5469dc4153a60289c5bae00215947c6ce09fcc0eVendor (CNA)
Linux Linux56964f6a31238fb41d5830bb42520c5b10ff7d8fVendor (CNA)
Linux Linux6388409b711eb91b14fa075a4d861ccc4df1cfe7Vendor (CNA)
Linux Linux7021acc84c2e0add77a1a33152e3a1e428fdbfdbVendor (CNA)
Linux Linux761e8c5eb13d1b5e196b0b39bdfed6fc67af9dd2Vendor (CNA)
Linux Linuxe24625bff786fa3f22cc38b5038362b910621e83Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.113-1~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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 6, 2026+19 d
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. Exploit maturity— → none
  2. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records