s390/boot: Avoid IPL parameter append past command line
In the Linux kernel, the following vulnerability has been resolved: s390/boot: Avoid IPL parameter append past command line A command line may occupy all but the terminating byte of COMMAND_LINE_SIZE. In that case append_ipl_block_parm() passes a zero size to the IPL parameter conversion helpers and points the destination one byte past early_command_line. The helpers subtract one from the unsigned size and write the converted parameter outside the command line buffer. Convert the IPL parameter in the command line parsing buffer first. A parameter beginning with '=' can then replace the existing command line regardless of its length, while other parameters are appended only when space remains.
CVE-2026-98403
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-2026-98403
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": "5ecb2da660ab8eddafe059a6a8a708465db89ca2",
"lessThan": "af9866021a00ab9eeacf0c33ee73f3d134b4ed70",
"versionType": "git"
},
{
"status": "affected",
"version": "5ecb2da660ab8eddafe059a6a8a708465db89ca2",
"lessThan": "73eec5a0d55916d7e1115f5d03a7ffc06d6215cf",
"versionType": "git"
},
{
"status": "affected",
"version": "5ecb2da660ab8eddafe059a6a8a708465db89ca2",
"lessThan": "8d11bfec8666f8409fac9072e9c25b691d3e30ac",
"versionType": "git"
},
{
"status": "affected",
"version": "5ecb2da660ab8eddafe059a6a8a708465db89ca2",
"lessThan": "d76181dfabdaa720703167393704efacba343442",
"versionType": "git"
}
],
"programFiles": [
"arch/s390/boot/ipl_parm.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/s390/boot/ipl_parm.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98403
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38471 · Revision 1
- Added to Heist Feed
- Publisher date