VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

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

Source GCVE Database

Authoritative record:CVE-2026-98754· High

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

Data as of 26 Oct 2026, 14:05 UTC

Severity

High

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 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.

ghsa-phxc-9rqx-x894

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 has been implemented in the Linux kernel to hold the port lock when clearing the tty pointer in vcc_cleanup(), eliminating the race condition. Users should apply the official kernel update or patch that includes this fix. No additional mitigations are indicated.

Description

A use-after-free vulnerability in the Linux kernel's tty vcc component was resolved. The issue occurs because vcc_cleanup() clears the port->tty pointer without holding the port lock, causing a race condition with vcc_event() callbacks that access tty->port under the lock. This can lead to dereferencing freed memory.

References

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