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-rt-livepatchUpgrade dlm-kmp-defaultUpgrade kselftests-kmp-rtUpgrade ocfs2-kmp-defaultUpgrade kernel-azureUpgrade kernel-rt-vdsoUpgrade dtb-nvidiaUpgrade kernel-docsUpgrade dtb-armUpgrade kernel-obs-buildUpgrade dtb-caviumUpgrade kernel-source-vanillaUpgrade dtb-sprdUpgrade dtb-allwinnerUpgrade gfs2-kmp-azureUpgrade kernel-rt-develUpgrade dtb-rockchipUpgrade kernel-default-base-rebuildUpgrade dtb-mediatekUpgrade ocfs2-kmp-azureUpgrade dtb-socionextUpgrade kernel-default-develUpgrade kernel-azure-livepatch-develUpgrade kernel-debug-develUpgrade dtb-xilinxUpgrade cluster-md-kmp-azureUpgrade kernel-default-livepatchUpgrade kselftests-kmp-64kbUpgrade kernel-docs-htmlUpgrade cluster-md-kmp-defaultUpgrade kernel-rt_debug-vdsoUpgrade kernel-64kb-develUpgrade kernel-64kb-optionalUpgrade dtb-freescaleUpgrade ocfs2-kmp-rtUpgrade ocfs2-kmp-64kbUpgrade kernel-source-azureUpgrade gfs2-kmp-rtUpgrade kernel-64kbUpgrade kernel-kvmsmallUpgrade reiserfs-kmp-64kbUpgrade kernel-kvmsmall-develUpgrade kernel-obs-qaUpgrade kernel-debugUpgrade kernel-azure-optionalUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-macrosUpgrade kernel-64kb-livepatch-develUpgrade kernel-rt_debug-develUpgrade cluster-md-kmp-rtUpgrade dtb-broadcomUpgrade kernel-rt-livepatch-develUpgrade kernel-zfcpdumpUpgrade dtb-amazonUpgrade kernel-sourceUpgrade kernel-symsUpgrade dtb-alteraUpgrade kernel-devel-rtUpgrade kselftests-kmp-defaultUpgrade kernel-defaultUpgrade dtb-qcomUpgrade kernel-rt-extraUpgrade kernel-develUpgrade reiserfs-kmp-rtUpgrade kernel-kvmsmall-vdsoUpgrade kernel-debug-vdsoUpgrade kernel-source-rtUpgrade dlm-kmp-rtUpgrade kselftests-kmp-azureUpgrade dtb-renesasUpgrade dlm-kmp-azureUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-64kb-extraUpgrade cluster-md-kmp-64kbUpgrade reiserfs-kmp-azureUpgrade gfs2-kmp-defaultUpgrade kernel-default-livepatch-develUpgrade kernel-default-baseUpgrade kernel-rtUpgrade kernel-rt-optionalUpgrade kernel-azure-devel | Aug 9, 2024 | May 21, 2024 |
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