VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

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

Source GCVE Database

Authoritative record:CVE-2026-98755· Medium

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

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated by Threat Radar · 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.

ghsa-g66w-7p4m-7w28

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

A fix has been implemented in the Linux kernel to zero-initialize the control packet in the vcc_send_ctl() function, eliminating the uninitialized memory leak. Users should apply the official kernel updates that include this patch once available. Patch status is not explicitly confirmed in the provided data; therefore, check the vendor advisory for current remediation guidance.

Description

A vulnerability in the Linux kernel's tty vcc component involved a stack-allocated control packet structure that was only partially initialized. Specifically, the tag.stype_env field was left uninitialized before being sent via ldc_write(), which could lead to leakage of kernel stack data to the LDC peer. This issue has been resolved by zero-initializing the control packet in the vcc_send_ctl() function.

References

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