AI Score
Confidence
Low
EPSS
Percentile
15.5%
SSVC
Exploitation
none
Automatable
no
Technical Impact
partial
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]]
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "99cb0dbd47a1",
"lessThan": "6d67b2a73b8e",
"versionType": "git"
},
{
"status": "affected",
"version": "99cb0dbd47a1",
"lessThan": "5fcb6fce74ff",
"versionType": "git"
},
{
"status": "affected",
"version": "99cb0dbd47a1",
"lessThan": "a4aeaa06d45e",
"versionType": "git"
}
],
"programFiles": [
"mm/khugepaged.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.4",
"versionType": "custom"
},
{
"status": "unaffected",
"version": "5.10.78",
"versionType": "custom",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.14.16",
"versionType": "custom",
"lessThanOrEqual": "5.14.*"
},
{
"status": "unaffected",
"version": "5.15",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"mm/khugepaged.c"
],
"defaultStatus": "affected"
}
]