CVE-2021-47491
EPSS
0.04 % (16th)
Advisories
10
NVD Status
Awaiting Analysis
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.
[shy828301@gmail.com: fix vm_file check [3]]
- CVE Status
- PUBLISHED
- NVD Status
- Awaiting Analysis
- CNA
- kernel.org
- Published Date
-
2024-05-22 09:15:10
(3 months ago) - Updated Date
-
2024-05-22 12:46:53
(3 months ago)
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