kho: fix size calculation in kho_preserved_memory_reserve()
In the Linux kernel, the following vulnerability has been resolved: kho: fix size calculation in kho_preserved_memory_reserve() kho_preserved_memory_reserve() calculates the size of a preservation by doing 1 << (order + PAGE_SHIFT). Since the '1' is a 32-bit integer, it can only be shifted by 31. That is, it will only work for preservations up to 2 GiB. Larger preservations will trigger undefined behaviour. While preservations larger than 2 GiB can't be obtained via folios currently, they can be obtained via kho_preserve_pages(). For example, memblock reserve_mem uses kho_preserve_pages(). Reservations larger than 2 GiB are valid and will trigger this bug if properly aligned. Fix it by using 1UL for shifting.
CVE-2026-89568
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89568
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "fc33e4b44b2717feba2f6f07ce7943a96499c9ec",
"lessThan": "0692a8fdf0222af130c8ea97426f1c3bf3814905",
"versionType": "git"
},
{
"status": "affected",
"version": "fc33e4b44b2717feba2f6f07ce7943a96499c9ec",
"lessThan": "42a6f03cf352eb6e6dbeef95e75e686f4cdb9bd1",
"versionType": "git"
},
{
"status": "affected",
"version": "fc33e4b44b2717feba2f6f07ce7943a96499c9ec",
"lessThan": "3a0b8fa2eb36afc88b62a95f33f0c77c71fa5ded",
"versionType": "git"
}
],
"programFiles": [
"kernel/liveupdate/kexec_handover.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/liveupdate/kexec_handover.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89568
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #35079 · Revision 1
- Added to Heist Feed
- Publisher date