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Hat Bugzilla ID","text":"2346121"}],"notes":[{"category":"description","text":"A flaw was found in grub2. When performing a symlink lookup from a romfs filesystem, grub's romfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_romfs_read_symlink() may cause out-of-bounds writes when the calling grub_disk_read() function. This issue may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution by-passing secure boot protections.","title":"Vulnerability description"},{"category":"summary","text":"grub2: romfs: Integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading dat","title":"Vulnerability summary"},{"category":"other","text":"Red Hat supported products are not affected by this vulnerability, as the grub2 versions as shipped with it do not include the romfs filesystem module.","title":"Statement"},{"category":"general","text":"The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.","title":"CVSS score 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romfs: Integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading dat"}]}