In the Linux kernel, the following vulnerability has been resolved:
x86/tdx: Zero out the missing RSI in TDX_HYPERCALL macro
In the TDX_HYPERCALL asm, after the TDCALL instruction returns from the untrusted VMM, the registers that the TDX guest shares to the VMM need to be cleared to avoid speculative execution of VMM-provided values.
RSI is specified in the bitmap of those registers, but it is missing when zeroing out those registers in the current TDX_HYPERCALL.
It was there when it was originally added in commit 752d13305c78 ("x86/tdx: Expand __tdx_hypercall() to handle more arguments"), but was later removed in commit 1e70c680375a ("x86/tdx: Do not corrupt frame-pointer in __tdx_hypercall()"), which was correct because %rsi is later restored in the "pop %rsi". However a later commit 7a3a401874be ("x86/tdx: Drop flags from __tdx_hypercall()") removed that "pop %rsi" but forgot to add the "xor %rsi, %rsi" back.
Fix by adding it back.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 21, 2024 |
| Suse | — | Upgrade reiserfs-kmp-rtUpgrade kernel-rt-livepatch-develUpgrade kernel-symsUpgrade dlm-kmp-azureUpgrade ocfs2-kmp-rtUpgrade kernel-rt_debug-vdsoUpgrade dtb-amlogicUpgrade cluster-md-kmp-defaultUpgrade reiserfs-kmp-azureUpgrade dtb-nvidiaUpgrade dtb-mediatekUpgrade dlm-kmp-rtUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-devel-rtUpgrade kernel-azure-vdsoUpgrade kernel-default-base-rebuildUpgrade dlm-kmp-defaultUpgrade reiserfs-kmp-defaultUpgrade kselftests-kmp-rtUpgrade kernel-rt_debugUpgrade dtb-apmUpgrade dtb-socionextUpgrade cluster-md-kmp-64kbUpgrade kernel-macrosUpgrade dtb-armUpgrade kernel-default-extraUpgrade kernel-default-livepatch-develUpgrade dtb-renesasUpgrade kselftests-kmp-defaultUpgrade dtb-xilinxUpgrade kernel-rt-develUpgrade kernel-syms-rtUpgrade kernel-64kb-develUpgrade kernel-rt-extraUpgrade kernel-64kb-extraUpgrade kernel-obs-qaUpgrade kernel-default-livepatchUpgrade dtb-rockchipUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-defaultUpgrade kernel-kvmsmall-develUpgrade kernel-rt-optionalUpgrade ocfs2-kmp-azureUpgrade kernel-default-baseUpgrade dtb-hisiliconUpgrade kernel-rtUpgrade dtb-qcomUpgrade kernel-source-rtUpgrade kernel-kvmsmall-vdsoUpgrade kernel-debug-develUpgrade kernel-azure-livepatch-develUpgrade kernel-docsUpgrade kernel-obs-buildUpgrade kernel-debugUpgrade kernel-azureUpgrade dtb-caviumUpgrade dtb-allwinnerUpgrade gfs2-kmp-defaultUpgrade kernel-zfcpdumpUpgrade kernel-syms-azureUpgrade dtb-amazonUpgrade kernel-docs-htmlUpgrade kernel-64kb-livepatch-develUpgrade gfs2-kmp-azureUpgrade kernel-default-vdsoUpgrade kernel-default-optionalUpgrade dtb-amdUpgrade dtb-sprdUpgrade kernel-default-develUpgrade kernel-kvmsmallUpgrade reiserfs-kmp-64kbUpgrade kernel-develUpgrade kernel-devel-azureUpgrade kernel-azure-extraUpgrade kernel-64kb-optionalUpgrade kernel-64kbUpgrade gfs2-kmp-rtUpgrade gfs2-kmp-64kbUpgrade dtb-lgUpgrade cluster-md-kmp-azureUpgrade kernel-rt_debug-develUpgrade ocfs2-kmp-64kbUpgrade kernel-azure-optionalUpgrade dlm-kmp-64kbUpgrade kernel-azure-develUpgrade kernel-source-azureUpgrade kernel-rt-vdsoUpgrade dtb-exynosUpgrade dtb-broadcomUpgrade kernel-sourceUpgrade dtb-appleUpgrade cluster-md-kmp-rtUpgrade ocfs2-kmp-defaultUpgrade kselftests-kmp-azureUpgrade kernel-source-vanillaUpgrade dtb-alteraUpgrade kselftests-kmp-64kbUpgrade dtb-freescaleUpgrade kernel-debug-vdsoUpgrade dtb-marvellUpgrade kernel-debug-livepatch-devel | Aug 9, 2024 | May 21, 2024 |
| Ubuntu | — | Upgrade linux-nvidia-6.5 | Nov 19, 2024 | May 21, 2024 |
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