There are a few integer overflows in grub2 while handling several sizes related to initrd information. These could be triggered by a crafted filesystem with very large files.
There's an issue on current grub version caused by a integer overflow at grub_cmd_initrd() function. When having extremely large files, the size file variable used for calculation may overflow, allowing an attacker to cause further invalid memory accesses causing memory corruption and integrity issues.
Acknowledgments: Name: Colin Watson (Debian / Canonical Ltd.), Chris Coulson (Canonical)
Statement: There's no mitigation available other than installing the update packages.
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:3216 https://access.redhat.com/errata/RHSA-2020:3216
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-2020-15707
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:3217 https://access.redhat.com/errata/RHSA-2020:3217
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.1 Extended Update Support Via RHSA-2020:3223 https://access.redhat.com/errata/RHSA-2020:3223
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions Via RHSA-2020:3227 https://access.redhat.com/errata/RHSA-2020:3227
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.4 Advanced Update Support Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions Red Hat Enterprise Linux 7.4 Telco Extended Update Support Via RHSA-2020:3275 https://access.redhat.com/errata/RHSA-2020:3275
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.6 Extended Update Support Via RHSA-2020:3271 https://access.redhat.com/errata/RHSA-2020:3271
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.3 Advanced Update Support Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions Red Hat Enterprise Linux 7.3 Telco Extended Update Support Via RHSA-2020:3276 https://access.redhat.com/errata/RHSA-2020:3276
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.7 Extended Update Support Via RHSA-2020:3274 https://access.redhat.com/errata/RHSA-2020:3274
Created grub2 tracking bugs for this issue: Affects: fedora-all [bug 1863025]