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A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph, this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this vulnerability to circumvent the secure boot mechanism.
Created grub2 tracking bugs for this issue: Affects: fedora-all [bug 2142996]
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions Via RHSA-2022:8494 https://access.redhat.com/errata/RHSA-2022:8494
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.2 Advanced Update Support Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions Red Hat Enterprise Linux 8.2 Telecommunications Update Service Via RHSA-2022:8800 https://access.redhat.com/errata/RHSA-2022:8800
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.0 Extended Update Support Via RHSA-2022:8978 https://access.redhat.com/errata/RHSA-2022:8978
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2023:0049 https://access.redhat.com/errata/RHSA-2023:0049
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.6 Extended Update Support Via RHSA-2023:0048 https://access.redhat.com/errata/RHSA-2023:0048
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.4 Extended Update Support Via RHSA-2023:0047 https://access.redhat.com/errata/RHSA-2023:0047
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2023:0752 https://access.redhat.com/errata/RHSA-2023:0752
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2022-2601