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

Severity: unknown
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-18 · updated 2026-10-30

Description

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.

Affected products

Linux: 4.14 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/1f71f565e3585da1098ff19ca3c24687dab59185
https://git.kernel.org/stable/c/360111628a968ebc8e6da400b28f23ae317d4e04
https://git.kernel.org/stable/c/399aa38af1d78001612e3130b2056ea392a355ca
https://git.kernel.org/stable/c/4335278d0e75395cbfaf71c84b521df56d69e936
https://git.kernel.org/stable/c/4b59afc8af3143ae03e4f9b81ca66aa5a1c1ebed
https://git.kernel.org/stable/c/639178bc8e77aad307a9ee5e62471c5dcc8dda67
https://git.kernel.org/stable/c/6f1a08ef02825b440126c406ea63ef6128888e15
https://git.kernel.org/stable/c/9e2eedb3611c1a3a377105cb26af52731e826fa5

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