CVE-2026-98175 Linux Kernel smb client - Use After Free

Linux kernel contains a use-after-free vulnerability in smb client due to not canceling server->reconnect delayed work in clean_demultiplex_info(), letting attackers cause memory corruption, exploit requires triggering demultiplex thread exit with queued reconnect work.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.33% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
6 October 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix that cancels server->reconnect delayed work in clean_demultiplex_info().

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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