s390/mm: Do not map lowcore with identity mapping
In the Linux kernel, the following vulnerability has been resolved: s390/mm: Do not map lowcore with identity mapping Since the identity mapping is pinned to address zero the lowcore is always also mapped to address zero, this happens regardless of the relocate_lowcore command line option. If the option is specified the lowcore is mapped twice, instead of only once. This means that NULL pointer accesses will succeed instead of causing an exception (low address protection still applies, but covers only parts). To fix this never map the first two pages of physical memory with the identity mapping.
CVE-2025-38733
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-2025-38733
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": "32db401965f165f7c44447d0508097f070c8f576",
"lessThan": "30bf5728bb217a6d1ba73f44094c9b9c6bc9a567",
"versionType": "git"
},
{
"status": "affected",
"version": "32db401965f165f7c44447d0508097f070c8f576",
"lessThan": "1d7864acd497cb468a998d44631f84896f885e85",
"versionType": "git"
},
{
"status": "affected",
"version": "32db401965f165f7c44447d0508097f070c8f576",
"lessThan": "93f616ff870a1fb7e84d472cad0af651b18f9f87",
"versionType": "git"
},
{
"status": "affected",
"version": "0b99d0e17d6a73a0526f92bc6b54b2b95e67a31d",
"versionType": "git"
},
{
"status": "affected",
"version": "6.10.11",
"lessThan": "6.11",
"versionType": "semver"
}
],
"programFiles": [
"arch/s390/boot/vmem.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.44",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.16.4",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/s390/boot/vmem.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-38733
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30614 · Revision 1
- Added to Heist Feed
- Publisher date