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

CVE-2026-98755: tty: vcc: zero-initialize control packet in vcc_send_ctl()

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 1f71f565e3585da1098ff19ca3c24687dab59185, 360111628a968ebc8e6da400b28f23ae317d4e04, 399aa38af1d78001612e3130b2056ea392a355ca; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 1f71f565e3585da1098ff19ca3c24687dab59185, 360111628a968ebc8e6da400b28f23ae317d4e04, 399aa38af1d78001612e3130b2056ea392a355ca; 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: zero-initialize control packet in vcc_send_ctl() The stack-allocated struct vio_vcc pkt was partially initialized, leaving the tag.stype_env field uninitialized before being sent via ldc_write(), potentially leaking kernel stack data to the LDC peer.

—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

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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
    • 8868e44a56160328cd4003d95f4083f64b136e33 and later · before 9e2eedb3611c1a3a377105cb26af52731e826fa5affected · git
    • 8868e44a56160328cd4003d95f4083f64b136e33 and later · before 360111628a968ebc8e6da400b28f23ae317d4e04affected · git
    • 8868e44a56160328cd4003d95f4083f64b136e33 and later · before 639178bc8e77aad307a9ee5e62471c5dcc8dda67affected · git
    • 8868e44a56160328cd4003d95f4083f64b136e33 and later · before 4b59afc8af3143ae03e4f9b81ca66aa5a1c1ebedaffected · git
    • 8868e44a56160328cd4003d95f4083f64b136e33 and later · before 6f1a08ef02825b440126c406ea63ef6128888e15affected · git
    • 8868e44a56160328cd4003d95f4083f64b136e33 and later · before 4335278d0e75395cbfaf71c84b521df56d69e936affected · git
    • 8868e44a56160328cd4003d95f4083f64b136e33 and later · before 399aa38af1d78001612e3130b2056ea392a355caaffected · git
    • 8868e44a56160328cd4003d95f4083f64b136e33 and later · before 1f71f565e3585da1098ff19ca3c24687dab59185affected · 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-2026-98753Oct 18, 2026 · tty: tty_port: restore TTY_IO_ERROR on activation failure
    0Monitor
  • ← EarlierCVE-2026-98754Oct 18, 2026 · tty: vcc: hold port lock when clearing tty pointer in vcc_cleanup
    0Monitor
  • Later →CVE-2026-98756Oct 18, 2026 · usb: cdns3: Fix NULL pointer dereference in cdns3_pci_probe
    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 Linux1f71f565e3585da1098ff19ca3c24687dab59185Vendor (CNA)
Linux Linux360111628a968ebc8e6da400b28f23ae317d4e04Vendor (CNA)
Linux Linux399aa38af1d78001612e3130b2056ea392a355caVendor (CNA)
Linux Linux4335278d0e75395cbfaf71c84b521df56d69e936Vendor (CNA)
Linux Linux4b59afc8af3143ae03e4f9b81ca66aa5a1c1ebedVendor (CNA)
Linux Linux639178bc8e77aad307a9ee5e62471c5dcc8dda67Vendor (CNA)
Linux Linux6f1a08ef02825b440126c406ea63ef6128888e15Vendor (CNA)
Linux Linux9e2eedb3611c1a3a377105cb26af52731e826fa5Vendor (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