Bug 2496640 (CVE-2026-56001)
| Summary: | CVE-2026-56001 libXfont2: BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow | ||
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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: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | unspecified | CC: | gtanzill, jbuscemi, rhel-process-autobot, security-response-team, 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 libXfont2. In the BitmapScaleBitmaps() function, an integer overflow can occur when calculating the memory needed for font glyphs. This overflow leads to a heap buffer overflow, where a smaller-than-required memory buffer is allocated. A local attacker can exploit this by loading a specially crafted PCF font, potentially leading to arbitrary code execution or a denial of service.
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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: | |||
| Deadline: | 2026-07-08 | ||
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Description
OSIDB Bzimport
2026-07-02 18:31:34 UTC
Upstream advisory: https://www.openwall.com/lists/oss-security/2026/07/08/1 Upstream commit: https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/be0b08e2d354138d3222b4490e2a77c6ee42f778 This issue has been addressed in the following products: Red Hat Enterprise Linux 10 Via RHSA-2026:47079 https://access.redhat.com/errata/RHSA-2026:47079 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:47103 https://access.redhat.com/errata/RHSA-2026:47103 This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:47084 https://access.redhat.com/errata/RHSA-2026:47084 This issue has been addressed in the following products: Red Hat Enterprise Linux 10.0 Extended Update Support Via RHSA-2026:51061 https://access.redhat.com/errata/RHSA-2026:51061 This issue has been addressed in the following products: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Via RHSA-2026:51060 https://access.redhat.com/errata/RHSA-2026:51060 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Via RHSA-2026:51062 https://access.redhat.com/errata/RHSA-2026:51062 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Via RHSA-2026:51058 https://access.redhat.com/errata/RHSA-2026:51058 This issue has been addressed in the following products: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat Enterprise Linux 8.8 Telecommunications Update Service Via RHSA-2026:51067 https://access.redhat.com/errata/RHSA-2026:51067 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Extended Lifecycle Support Via RHSA-2026:51063 https://access.redhat.com/errata/RHSA-2026:51063 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:51059 https://access.redhat.com/errata/RHSA-2026:51059 This issue has been addressed in the following products: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Via RHSA-2026:51066 https://access.redhat.com/errata/RHSA-2026:51066 |