VulnerabilityPublished 18 Oct 2026Updated 26 Oct 2026

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

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in 821050631750e982007c0856c119346edba51cae : patch Linux kernel soon.

Data as of 26 Oct 2026, 12:55 UTC

Severity

High

Rated High 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 821050631750e982007c0856c119346edba51cae, 57753441ef84bee3bf0e9ee1e3778d119c44aa32, 88f6ecb058801e9ce7b9aabc966530118d7cd53c +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 ≥ 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb, < 821050631750e982007c0856c119346edba51cae	Fixed in 821050631750e982007c0856c119346edba51cae
LinuxLinux	Affected ≥ 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb, < 57753441ef84bee3bf0e9ee1e3778d119c44aa32	Fixed in 57753441ef84bee3bf0e9ee1e3778d119c44aa32
LinuxLinux	Affected ≥ 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb, < 88f6ecb058801e9ce7b9aabc966530118d7cd53c	Fixed in 88f6ecb058801e9ce7b9aabc966530118d7cd53c
LinuxLinux	Affected ≥ 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb, < 03b49c991abb8d021ca6fe51cd173447236b0552	Fixed in 03b49c991abb8d021ca6fe51cd173447236b0552
LinuxLinux	Affected ≥ 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb, < 1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4	Fixed in 1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4
LinuxLinux	Affected =4.14	Fixed in–

AI-suggested

A fix is available and has been applied in specific commits to the Linux kernel. Users should update to a Linux kernel version that includes these fixes to mitigate the vulnerability.

Description

A use-after-free vulnerability exists in the Linux kernel's tty vcc component due to improper locking when clearing the tty pointer in the vcc_cleanup function. This race condition can lead to dereferencing freed memory during LDC callbacks, potentially causing system instability or crashes. The issue affects Linux kernel version 4.14 and has been fixed in later commits.

Impact

This vulnerability can lead to use-after-free conditions in the Linux kernel, potentially causing kernel crashes or instability. There is no indication of known exploitation in the wild. The impact is limited to affected kernel versions where this race condition exists.

Summary

The Linux kernel's tty vcc component had a race condition where vcc_cleanup() cleared the port->tty pointer without holding the port lock, while vcc_event() LDC callbacks accessed port->tty under the lock and then used tty->port. This could cause a use-after-free scenario if the callback dereferenced tty->port after it was destroyed and freed. The vulnerability is resolved by ensuring the port lock is held when clearing the tty pointer in vcc_cleanup.

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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