s390/ipl: Fix NULL deref in kdump without re-IPL parm block
In the Linux kernel, the following vulnerability has been resolved: s390/ipl: Fix NULL deref in kdump without re-IPL parm block Some IPL types, like HMC FTP boot or QEMU direct kernel boot, might not provide an IPL parameter block. In this case, reipl_type_init() selects IPL_TYPE_UNKNOWN, and reipl_block_actual remains NULL. kdump passes the re-IPL parameter block to the dump kernel through os_info. Before commit 3b9678472bab ("s390/ipl: correct kdump reipl block checksum calculation"), the os_info entry was added only for IPL types which initialized reipl_block_actual. That commit moved the os_info update to machine_crash_shutdown(), making it unconditional. As a result, set_os_info_reipl_block() dereferences reipl_block_actual for IPL_TYPE_UNKNOWN. This may happen to work by chance when address zero contains readable lowcore data and the resulting empty os_info entry is ignored by the dump kernel. Skip the os_info update when no re-IPL parameter block is available. Kdump then collect the dump and reboot without setting re-IPL parameter block.
CVE-2026-98400
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-2026-98400
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": "3b9678472bab86ae654cf2c18d5dd551558045be",
"lessThan": "030e88812435fc5d6aa42eee41fa77b5ea620327",
"versionType": "git"
},
{
"status": "affected",
"version": "3b9678472bab86ae654cf2c18d5dd551558045be",
"lessThan": "92d0829eae257544b6b0faccb6e7079c45e22d48",
"versionType": "git"
},
{
"status": "affected",
"version": "3b9678472bab86ae654cf2c18d5dd551558045be",
"lessThan": "50f9c40768e84f30d374235b3ee3850a94d9ac29",
"versionType": "git"
},
{
"status": "affected",
"version": "3b9678472bab86ae654cf2c18d5dd551558045be",
"lessThan": "b6bf82bc5e00afaf836f8bb9a676bffc182a6bbd",
"versionType": "git"
},
{
"status": "affected",
"version": "3b9678472bab86ae654cf2c18d5dd551558045be",
"lessThan": "7f918871112e8e7c581e99eb8e545af4e59c8367",
"versionType": "git"
}
],
"programFiles": [
"arch/s390/kernel/ipl.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"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/kernel/ipl.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98400
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38467 · Revision 1
- Added to Heist Feed
- Publisher date