Improper Control of a Resource Through its Lifetime Affecting kernel-cross-headers package, versions <0:4.18.0-553.16.1.el8_10
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Test your applications- Snyk ID SNYK-RHEL8-KERNELCROSSHEADERS-7037335
- published 23 May 2024
- disclosed 22 May 2024
Introduced: 22 May 2024
CVE-2021-47491 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-cross-headers to version 0:4.18.0-553.16.1.el8_10 or higher.
This issue was patched in RHSA-2024:5101.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-cross-headers package and not the kernel-cross-headers package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
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]]