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

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Summary

CVECVE-2026-98400
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-14 14:17:51 UTC
Updated2026-10-19 10:18:44 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3b9678472bab86ae654cf2c18d5dd551558045be 030e88812435fc5d6aa42eee41fa77b5ea620327 git Not specified
CNA Linux Linux affected 3b9678472bab86ae654cf2c18d5dd551558045be 92d0829eae257544b6b0faccb6e7079c45e22d48 git Not specified
CNA Linux Linux affected 3b9678472bab86ae654cf2c18d5dd551558045be 50f9c40768e84f30d374235b3ee3850a94d9ac29 git Not specified
CNA Linux Linux affected 3b9678472bab86ae654cf2c18d5dd551558045be b6bf82bc5e00afaf836f8bb9a676bffc182a6bbd git Not specified
CNA Linux Linux affected 3b9678472bab86ae654cf2c18d5dd551558045be 7f918871112e8e7c581e99eb8e545af4e59c8367 git Not specified
CNA Linux Linux affected 4.17 Not specified
CNA Linux Linux unaffected 4.17 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/7f918871112e8e7c581e99eb8e545af4e59c8367 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b6bf82bc5e00afaf836f8bb9a676bffc182a6bbd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/030e88812435fc5d6aa42eee41fa77b5ea620327 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/92d0829eae257544b6b0faccb6e7079c45e22d48 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/50f9c40768e84f30d374235b3ee3850a94d9ac29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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