VulnerabilityPublished 18 Oct 2026Updated 26 Oct 2026

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

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in 4335278d0e75395cbfaf71c84b521df56d69e936 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:07 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 4335278d0e75395cbfaf71c84b521df56d69e936, 399aa38af1d78001612e3130b2056ea392a355ca, 6f1a08ef02825b440126c406ea63ef6128888e15 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 8868e44a56160328cd4003d95f4083f64b136e33, < 4335278d0e75395cbfaf71c84b521df56d69e936	Fixed in 4335278d0e75395cbfaf71c84b521df56d69e936
LinuxLinux	Affected ≥ 8868e44a56160328cd4003d95f4083f64b136e33, < 399aa38af1d78001612e3130b2056ea392a355ca	Fixed in 399aa38af1d78001612e3130b2056ea392a355ca
LinuxLinux	Affected ≥ 8868e44a56160328cd4003d95f4083f64b136e33, < 6f1a08ef02825b440126c406ea63ef6128888e15	Fixed in 6f1a08ef02825b440126c406ea63ef6128888e15
LinuxLinux	Affected ≥ 8868e44a56160328cd4003d95f4083f64b136e33, < 4b59afc8af3143ae03e4f9b81ca66aa5a1c1ebed	Fixed in 4b59afc8af3143ae03e4f9b81ca66aa5a1c1ebed
LinuxLinux	Affected ≥ 8868e44a56160328cd4003d95f4083f64b136e33, < 1f71f565e3585da1098ff19ca3c24687dab59185	Fixed in 1f71f565e3585da1098ff19ca3c24687dab59185
LinuxLinux	Affected =4.14	Fixed in–

AI-suggested

The vulnerability has been fixed in the Linux kernel by fully zero-initializing the control packet before sending. Users and administrators should apply the official patches or upgrade to a fixed kernel version containing the referenced commits. Since this is a kernel-level issue, updating the kernel is the recommended remediation.

Description

CVE-2026-98755 is a vulnerability in the Linux kernel's tty vcc component where a control packet structure was not fully zero-initialized before use. This partial initialization could lead to leakage of kernel stack data to a peer via the LDC communication channel. The issue affects Linux kernel version 4.14 and has been fixed in several subsequent commits.

Impact

An attacker able to interact with the LDC peer could potentially receive uninitialized kernel stack data, leading to information disclosure. This leakage could aid in further attacks by revealing sensitive kernel memory contents. There is no indication of remote code execution or privilege escalation from this vulnerability alone. No known exploits in the wild have been reported.

Summary

The vulnerability involves the stack-allocated struct vio_vcc pkt in the Linux kernel's tty vcc code. The struct was partially initialized, leaving the tag.stype_env field uninitialized before being sent through ldc_write(). This could result in unintended kernel stack data disclosure to the LDC peer. The flaw has been addressed by zero-initializing the control packet fully before sending it. The affected version explicitly noted is Linux kernel 4.14, with fixes applied in multiple commits.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 09:30 UTC

Technical details

References

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