s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block

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Summary

CVECVE-2026-98399
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-14 14:17:50 UTC
Updated2026-10-19 10:18:44 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block Unlike kdump, which passes the re-IPL parameter block through os_info, the stand-alone dump passes it through the IPL parm block address and checksum in lowcore. 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. Nevertheless, dump_reipl_run() unconditionally dereferences it when preparing the lowcore fields. This may happen to work by chance when address zero contains readable lowcore data. A zero IPL parameter block address is then stored in lowcore, causing the stand-alone dumper to enter disabled wait after completing the dump. Explicitly store a zero IPL parameter block address and checksum when no re-IPL parameter block is available. This does not change the behavior: the stand-alone dumper completes the dump and halts, while valid re-IPL parameter blocks continue to be handled as before.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 099b765139929efdcf232f8870804accf8c4cdc5 41647864e62b28388ecccc23a82f0e0a091f4ef2 git Not specified
CNA Linux Linux affected 099b765139929efdcf232f8870804accf8c4cdc5 aed56fa3108b7095e6a048e134981506c056a6cb git Not specified
CNA Linux Linux affected 099b765139929efdcf232f8870804accf8c4cdc5 8d7988e8116c3d29d9e02ca9d37ee84577643f2d git Not specified
CNA Linux Linux affected 099b765139929efdcf232f8870804accf8c4cdc5 280ff19853440d59e031cd8fe161e81305721262 git Not specified
CNA Linux Linux affected 099b765139929efdcf232f8870804accf8c4cdc5 37f61b71cbc0caefc01022a19ee56fc2510e2e6e git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/aed56fa3108b7095e6a048e134981506c056a6cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/41647864e62b28388ecccc23a82f0e0a091f4ef2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/280ff19853440d59e031cd8fe161e81305721262 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8d7988e8116c3d29d9e02ca9d37ee84577643f2d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/37f61b71cbc0caefc01022a19ee56fc2510e2e6e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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