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.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| 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 kernel-docsUpgrade kernel-source-vanillaUpgrade dtb-nvidiaUpgrade dtb-rockchipUpgrade kernel-64kb-extraUpgrade dtb-renesasUpgrade kernel-develUpgrade gfs2-kmp-defaultUpgrade kernel-rt-optionalUpgrade ocfs2-kmp-defaultUpgrade dlm-kmp-defaultUpgrade kselftests-kmp-rtUpgrade kernel-rt-vdsoUpgrade dtb-caviumUpgrade kselftests-kmp-defaultUpgrade cluster-md-kmp-64kbUpgrade kernel-kvmsmall-vdsoUpgrade dtb-socionextUpgrade kernel-default-optionalUpgrade kernel-obs-buildUpgrade kernel-rt-extraUpgrade cluster-md-kmp-rtUpgrade dtb-armUpgrade kernel-default-livepatch-develUpgrade dlm-kmp-rtUpgrade kernel-defaultUpgrade dtb-allwinnerUpgrade dtb-sprdUpgrade kernel-symsUpgrade dtb-mediatekUpgrade kernel-kvmsmall-develUpgrade dtb-lgUpgrade dtb-exynosUpgrade dtb-hisiliconUpgrade dtb-amdUpgrade kernel-macrosUpgrade cluster-md-kmp-defaultUpgrade ocfs2-kmp-64kbUpgrade dlm-kmp-64kbUpgrade kselftests-kmp-64kbUpgrade kernel-rt-livepatch-develUpgrade kernel-rt-livepatchUpgrade gfs2-kmp-rtUpgrade dtb-amlogicUpgrade gfs2-kmp-64kbUpgrade dtb-freescaleUpgrade kernel-rt-develUpgrade kernel-kvmsmallUpgrade ocfs2-kmp-rtUpgrade kernel-rtUpgrade kernel-64kb-optionalUpgrade dtb-xilinxUpgrade dtb-qcomUpgrade kernel-sourceUpgrade kernel-default-extraUpgrade dtb-broadcomUpgrade kernel-obs-qaUpgrade dtb-apmUpgrade kernel-zfcpdumpUpgrade dtb-alteraUpgrade dtb-amazonUpgrade dtb-marvellUpgrade kernel-64kb-develUpgrade kernel-default-livepatchUpgrade kernel-default-develUpgrade kernel-docs-htmlUpgrade dtb-appleUpgrade kernel-default-vdsoUpgrade kernel-64kb | Dec 5, 2025 | Nov 6, 2025 |
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