Bug 2548262 (CVE-2026-107708)
| Summary: | CVE-2026-107708 krb5: krb5: Denial of Service via malformed PAC in S4U2Proxy requests | ||
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| Product: | [Other] Security Response | Reporter: | OSIDB Bzimport <bzimport> |
| Component: | vulnerability | Assignee: | Product Security DevOps Team <prodsec-dev> |
| Status: | NEW --- | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | abokovoy, akhatavk, aos-team-art-private, asdas, dpaolell, eglynn, jdelft, jjoyce, jpretori, jrische, jschluet, jupierce, kbempah, lgarciaa, lhh, mbiarnes, mburns, mgarciac, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, solenoci, suppawar, vlaad, watson-tool-maintainers |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
A flaw was found in krb5. This vulnerability allows a compromised or malicious cross-realm trusted Key Distribution Center (KDC) to cause a Denial of Service (DoS). By sending an S4U2Proxy delegation request containing a malformed client name within a Privilege Attribute Certificate (PAC), an attacker can trigger a NULL pointer dereference that crashes the KDC daemon, interrupting authentication services.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | Type: | --- | |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
OSIDB Bzimport
2026-10-08 20:31:24 UTC
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