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-symsUpgrade ocfs2-kmp-64kbUpgrade dtb-amdUpgrade dtb-exynosUpgrade dtb-hisiliconUpgrade dtb-appleUpgrade kernel-rt-develUpgrade gfs2-kmp-rtUpgrade kernel-default-develUpgrade dtb-amlogicUpgrade kernel-default-livepatchUpgrade kernel-docs-htmlUpgrade dtb-mediatekUpgrade dlm-kmp-64kbUpgrade dtb-lgUpgrade kselftests-kmp-64kbUpgrade kernel-64kb-extraUpgrade kernel-obs-buildUpgrade kernel-default-optionalUpgrade kernel-docsUpgrade dlm-kmp-defaultUpgrade kernel-rt-optionalUpgrade kernel-rt-extraUpgrade kernel-develUpgrade kernel-defaultUpgrade dtb-sprdUpgrade cluster-md-kmp-rtUpgrade kselftests-kmp-rtUpgrade dtb-socionextUpgrade cluster-md-kmp-64kbUpgrade dtb-allwinnerUpgrade gfs2-kmp-defaultUpgrade dtb-nvidiaUpgrade kernel-source-vanillaUpgrade ocfs2-kmp-defaultUpgrade dtb-renesasUpgrade dtb-rockchipUpgrade dlm-kmp-rtUpgrade kselftests-kmp-defaultUpgrade kernel-rt-vdsoUpgrade kernel-kvmsmall-vdsoUpgrade dtb-armUpgrade kernel-default-livepatch-develUpgrade dtb-caviumUpgrade kernel-rt-livepatch-develUpgrade kernel-kvmsmallUpgrade gfs2-kmp-64kbUpgrade dtb-freescaleUpgrade kernel-rt-livepatchUpgrade dtb-qcomUpgrade dtb-xilinxUpgrade ocfs2-kmp-rtUpgrade kernel-64kb-optionalUpgrade kernel-obs-qaUpgrade kernel-zfcpdumpUpgrade kernel-default-extraUpgrade dtb-broadcomUpgrade dtb-alteraUpgrade kernel-sourceUpgrade dtb-amazonUpgrade kernel-macrosUpgrade kernel-64kb-develUpgrade kernel-rtUpgrade dtb-apmUpgrade cluster-md-kmp-defaultUpgrade kernel-64kbUpgrade kernel-default-vdsoUpgrade kernel-kvmsmall-develUpgrade dtb-marvell | Dec 5, 2025 | Nov 6, 2025 |
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