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

CVE-2026-98754: tty: vcc: hold port lock when clearing tty pointer in vcc_cleanup

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 03b49c991abb8d021ca6fe51cd173447236b0552, 1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4, 57753441ef84bee3bf0e9ee1e3778d119c44aa32; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 03b49c991abb8d021ca6fe51cd173447236b0552, 1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4, 57753441ef84bee3bf0e9ee1e3778d119c44aa32; azl3 kernel 6.6.157.1-1 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: vcc: hold port lock when clearing tty pointer in vcc_cleanup vcc_cleanup() sets port->tty to NULL without holding port->lock, racing with vcc_event() LDC callbacks that read port->tty under port->lock and then use tty->port. This can cause a use-after-free when the callback dereferences tty->port after cleanup has already destroyed and freed it.

—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

    • 4.14affected
    • 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb and later · before b0ad9d025c3229a628a82fbaa7578891075a950daffected · git
    • 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb and later · before b193617080b7036d143674089bcfb7d2ba3db588affected · git
    • 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb and later · before afcbb821c571f39b273127a7c7d26cb2cef27d2faffected · git
    • 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb and later · before 57753441ef84bee3bf0e9ee1e3778d119c44aa32affected · git
    • 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb and later · before 88f6ecb058801e9ce7b9aabc966530118d7cd53caffected · git
    • 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb and later · before 821050631750e982007c0856c119346edba51caeaffected · git
    • 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb and later · before 1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4affected · git
    • 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb and later · before 03b49c991abb8d021ca6fe51cd173447236b0552affected · git
    • before 4.14not 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-2026-98752Oct 18, 2026 · tty: port: fix tty_port_tty_vhangup() race
    0Monitor
  • ← EarlierCVE-2026-98753Oct 18, 2026 · tty: tty_port: restore TTY_IO_ERROR on activation failure
    0Monitor
  • Later →CVE-2026-98755Oct 18, 2026 · tty: vcc: zero-initialize control packet in vcc_send_ctl()
    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 Linux03b49c991abb8d021ca6fe51cd173447236b0552Vendor (CNA)
Linux Linux1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4Vendor (CNA)
Linux Linux57753441ef84bee3bf0e9ee1e3778d119c44aa32Vendor (CNA)
Linux Linux821050631750e982007c0856c119346edba51caeVendor (CNA)
Linux Linux88f6ecb058801e9ce7b9aabc966530118d7cd53cVendor (CNA)
Linux Linuxafcbb821c571f39b273127a7c7d26cb2cef27d2fVendor (CNA)
Linux Linuxb0ad9d025c3229a628a82fbaa7578891075a950dVendor (CNA)
Linux Linuxb193617080b7036d143674089bcfb7d2ba3db588Vendor (CNA)
azl3 kernel 6.6.157.1-1 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