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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 5, 2025 |
| Suse | — | Upgrade dlm-kmp-defaultUpgrade kernel-default-optionalUpgrade dtb-sprdUpgrade kernel-rt-extraUpgrade kernel-defaultUpgrade cluster-md-kmp-rtUpgrade dtb-armUpgrade dlm-kmp-rtUpgrade kernel-default-livepatch-develUpgrade kernel-obs-buildUpgrade kselftests-kmp-defaultUpgrade kernel-develUpgrade kernel-64kb-extraUpgrade kernel-docsUpgrade kernel-rt-vdsoUpgrade kernel-kvmsmall-vdsoUpgrade dtb-caviumUpgrade cluster-md-kmp-64kbUpgrade kselftests-kmp-rtUpgrade dtb-socionextUpgrade ocfs2-kmp-defaultUpgrade dtb-rockchipUpgrade dtb-renesasUpgrade dtb-nvidiaUpgrade kernel-source-vanillaUpgrade gfs2-kmp-defaultUpgrade dtb-allwinnerUpgrade kernel-rt-optionalUpgrade dtb-xilinxUpgrade kernel-rtUpgrade kernel-sourceUpgrade kernel-default-vdsoUpgrade dtb-exynosUpgrade kernel-64kb-develUpgrade kernel-64kbUpgrade kernel-obs-qaUpgrade kernel-zfcpdumpUpgrade ocfs2-kmp-rtUpgrade dtb-broadcomUpgrade dtb-amazonUpgrade dtb-apmUpgrade dtb-marvellUpgrade dtb-qcomUpgrade kernel-default-extraUpgrade kernel-64kb-optionalUpgrade kernel-rt-livepatch-develUpgrade gfs2-kmp-64kbUpgrade kernel-rt-livepatchUpgrade kernel-kvmsmallUpgrade dtb-mediatekUpgrade dtb-hisiliconUpgrade dtb-freescaleUpgrade kernel-docs-htmlUpgrade dtb-amlogicUpgrade gfs2-kmp-rtUpgrade kernel-rt-develUpgrade kernel-default-develUpgrade kernel-default-livepatchUpgrade dtb-alteraUpgrade kernel-kvmsmall-develUpgrade kernel-macrosUpgrade kernel-symsUpgrade ocfs2-kmp-64kbUpgrade dlm-kmp-64kbUpgrade kselftests-kmp-64kbUpgrade dtb-lgUpgrade cluster-md-kmp-defaultUpgrade dtb-amdUpgrade dtb-apple | Dec 5, 2025 | Nov 6, 2025 |
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