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]]
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Debian | 12 | all | linux | < 5.15.3-1 | linux_5.15.3-1_all.deb |
Debian | 11 | all | linux | < 5.10.84-1 | linux_5.10.84-1_all.deb |
Debian | 999 | all | linux | < 5.15.3-1 | linux_5.15.3-1_all.deb |
Debian | 13 | all | linux | < 5.15.3-1 | linux_5.15.3-1_all.deb |