High [CVE-2026-95511] lpadmin can escalate to root via privileged serial backend (cups2root)
This high-severity Red Hat Linux advisory covers CVE-2026-95511; related products: Red Hat Hardened Images.
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Summary
lpadmin can escalate to root via privileged serial backend (cups2root). Red Hat rates this important (CVSS 8.2).
Weakness: CWE-269.
Affected product named by the advisory: Red Hat Hardened Images.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation checklist
- There is no complete mitigation while the serial backend remains installed as a root backend. The following steps reduce risk: 1. If serial printers are not required, remove the serial backend package file or change its permissions so cupsd no longer runs it as root, for example: chmod 0755 /usr/lib/cups/backend/serial (path may be /usr/libexec/cups/backend/serial). 2. Restrict lpadmin (and other SystemGroup) membership to users who are already trusted with root-equivalent access. 3. Leave FileDevice unset or set to No in /etc/cups/cups-files.conf. 4. Keep SELinux in enforcing mode. The cupsd_t domain may block some of the file writes used in this chain.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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