In the Linux kernel, the following vulnerability has been resolved:
powerpc/64s: Fix unrecoverable MCE calling async handler from NMI
The machine check handler is not considered NMI on 64s. The early handler is the true NMI handler, and then it schedules the machine_check_exception handler to run when interrupts are enabled.
This works fine except the case of an unrecoverable MCE, where the true NMI is taken when MSR[RI] is clear, it can not recover, so it calls machine_check_exception directly so something might be done about it.
Calling an async handler from NMI context can result in irq state and other things getting corrupted. This can also trigger the BUG at arch/powerpc/include/asm/interrupt.h:168 BUG_ON(!arch_irq_disabled_regs(regs) && !(regs->msr & MSR_EE));
Fix this by making an _async version of the handler which is called in the normal case, and a NMI version that is called for unrecoverable interrupts.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | May 21, 2024 |
| Redhat_linux | — | Upgrade kernelNo solution existsUpgrade kernel-rt | Dec 5, 2024 | May 21, 2024 |
| Suse | — | Upgrade kernel-defaultUpgrade dtb-mediatekUpgrade dtb-qcomUpgrade kernel-azure-develUpgrade ocfs2-kmp-defaultUpgrade dtb-rockchipUpgrade kselftests-kmp-azureUpgrade dtb-renesasUpgrade kernel-default-livepatch-develUpgrade dlm-kmp-rtUpgrade kernel-debug-vdsoUpgrade reiserfs-kmp-rtUpgrade kernel-rt-livepatchUpgrade kernel-develUpgrade dlm-kmp-defaultUpgrade gfs2-kmp-defaultUpgrade kernel-default-base-rebuildUpgrade kselftests-kmp-rtUpgrade kselftests-kmp-defaultUpgrade kernel-azureUpgrade dlm-kmp-azureUpgrade dtb-nvidiaUpgrade kernel-docsUpgrade kernel-rt-vdsoUpgrade dtb-armUpgrade ocfs2-kmp-azureUpgrade kernel-obs-buildUpgrade dtb-sprdUpgrade gfs2-kmp-azureUpgrade dtb-caviumUpgrade kernel-rt_debug-livepatch-develUpgrade dtb-allwinnerUpgrade kernel-source-vanillaUpgrade kernel-rt-develUpgrade dtb-socionextUpgrade kernel-kvmsmall-vdsoUpgrade kernel-rtUpgrade reiserfs-kmp-azureUpgrade kernel-64kb-extraUpgrade kernel-default-baseUpgrade kernel-source-rtUpgrade kernel-rt-extraUpgrade kernel-rt-optionalUpgrade cluster-md-kmp-64kbUpgrade kernel-sourceUpgrade kernel-symsUpgrade kernel-rt_debugUpgrade dtb-amdUpgrade kernel-default-optionalUpgrade kernel-64kb-optionalUpgrade kernel-azure-optionalUpgrade dlm-kmp-64kbUpgrade ocfs2-kmp-rtUpgrade kernel-rt_debug-vdsoUpgrade dtb-freescaleUpgrade dtb-exynosUpgrade dtb-amazonUpgrade dtb-alteraUpgrade dtb-appleUpgrade kernel-rt_debug-develUpgrade kernel-debugUpgrade kernel-kvmsmallUpgrade kernel-default-vdsoUpgrade kernel-zfcpdumpUpgrade kernel-kvmsmall-develUpgrade kernel-obs-qaUpgrade kernel-macrosUpgrade cluster-md-kmp-rtUpgrade kernel-kvmsmall-livepatch-develUpgrade kselftests-kmp-64kbUpgrade kernel-64kbUpgrade kernel-64kb-develUpgrade kernel-source-azureUpgrade cluster-md-kmp-defaultUpgrade dtb-marvellUpgrade gfs2-kmp-rtUpgrade kernel-azure-livepatch-develUpgrade dtb-lgUpgrade dtb-apmUpgrade kernel-devel-azureUpgrade kernel-default-develUpgrade kernel-debug-livepatch-develUpgrade kernel-syms-azureUpgrade gfs2-kmp-64kbUpgrade kernel-docs-htmlUpgrade kernel-debug-develUpgrade cluster-md-kmp-azureUpgrade kernel-azure-vdsoUpgrade kernel-64kb-livepatch-develUpgrade reiserfs-kmp-64kbUpgrade kernel-devel-rtUpgrade dtb-amlogicUpgrade dtb-hisiliconUpgrade dtb-xilinxUpgrade kernel-default-livepatchUpgrade ocfs2-kmp-64kbUpgrade kernel-syms-rtUpgrade reiserfs-kmp-defaultUpgrade kernel-default-extraUpgrade kernel-rt-livepatch-develUpgrade kernel-azure-extraUpgrade dtb-broadcom | Aug 9, 2024 | May 21, 2024 |
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