Versions Affected : All versions prior to TrueNAS SCALE 22.02.0.1. Versions Not Affected : TrueNAS CORE is not vulnerable.

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Description

A flaw was found in the way the “flags” member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe and push_pipe functions in the Linux kernel and could thus contain stale values.

An unprivileged local user could use this flaw to write to pages in the page cache backed by read only files and as such escalate their privileges on the system.

CVSS

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Base score 7.8.

Workaround

No workarounds available

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Mitigation

• Currently there is no mitigation available for this flaw. Customers should update once they are available.

Commit

• TrueNAS Jira Ticket NAS-115202
• TrueNAS SCALE Commit

Further information

• 
• MITRE CVE-2022-0847 Entry