💣Exploit CVE-2021-47491 - In the Linux kernel, the following vulnerability h

[Maksim]

CVE ID : CVE-2021-47491
Published : May 22, 2024, 9:15 a.m. | 42 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: mm: khugepaged: skip huge page collapse for special files The read-only THP for filesystems will collapse THP for files opened readonly and mapped with VM_EXEC. The intended usecase is to avoid TLB misses for large text segments. But it doesn't restrict the file types so a THP could be collapsed for a non-regular file, for example, block device, if it is opened readonly and mapped with EXEC permission. This may cause bugs, like [1] and [2]. This is definitely not the intended usecase, so just collapse THP for regular files in order to close the attack surface. [[email protected]: fix vm_file check [3]]
Severity: 0.0 | NA
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