Bug 2463368 (CVE-2026-40356)
| Summary: | CVE-2026-40356 krb5: MIT Kerberos 5 (krb5): Denial of Service via integer underflow and out-of-bounds read | ||
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| Product: | [Other] Security Response | Reporter: | OSIDB Bzimport <bzimport> |
| Component: | vulnerability | Assignee: | Product Security <prodsec-ir-bot> |
| Status: | NEW --- | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | abokovoy, jrische, rhel-process-autobot, 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 MIT Kerberos 5 (krb5). An unauthenticated remote attacker can exploit an integer underflow and an out-of-bounds read vulnerability by calling `gss_accept_sec_context()` on a system with a NegoEx mechanism registered. This can lead to the process terminating, resulting in a Denial of Service (DoS).
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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: | |||
| Bug Depends On: | 2463395, 2463396, 2463397 | ||
| Bug Blocks: | |||
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Description
OSIDB Bzimport
2026-04-28 07:02:01 UTC
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:16799 https://access.redhat.com/errata/RHSA-2026:16799 This issue has been addressed in the following products: Red Hat Enterprise Linux 10 Via RHSA-2026:19145 https://access.redhat.com/errata/RHSA-2026:19145 This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:19357 https://access.redhat.com/errata/RHSA-2026:19357 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Via RHSA-2026:24685 https://access.redhat.com/errata/RHSA-2026:24685 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Via RHSA-2026:24686 https://access.redhat.com/errata/RHSA-2026:24686 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:24683 https://access.redhat.com/errata/RHSA-2026:24683 |