221 lines
11 KiB
JSON
221 lines
11 KiB
JSON
{
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"cveId": "CVE-2023-52874",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-21T15:19:24.264Z",
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"datePublished": "2024-05-21T15:32:07.937Z",
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"dateUpdated": "2026-08-05T09:11:47.346Z"
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/tdx: Zero out the missing RSI in TDX_HYPERCALL macro\n\nIn the TDX_HYPERCALL asm, after the TDCALL instruction returns from the\nuntrusted VMM, the registers that the TDX guest shares to the VMM need\nto be cleared to avoid speculative execution of VMM-provided values.\n\nRSI is specified in the bitmap of those registers, but it is missing\nwhen zeroing out those registers in the current TDX_HYPERCALL.\n\nIt was there when it was originally added in commit 752d13305c78\n(\"x86/tdx: Expand __tdx_hypercall() to handle more arguments\"), but was\nlater removed in commit 1e70c680375a (\"x86/tdx: Do not corrupt\nframe-pointer in __tdx_hypercall()\"), which was correct because %rsi is\nlater restored in the \"pop %rsi\". However a later commit 7a3a401874be\n(\"x86/tdx: Drop flags from __tdx_hypercall()\") removed that \"pop %rsi\"\nbut forgot to add the \"xor %rsi, %rsi\" back.\n\nFix by adding it back."
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{
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"lang": "en",
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"value": "AV:L - The attacker must be the local untrusted VMM/hypervisor on the same machine, injecting values via the TDVMCALL hypercall interface after guest #VE handling (MMIO, port I/O, HLT, MSR, CPUID); this is not reachable over the network.\nAC:L - The VMM fully controls RSI on every hypercall return and can induce frequent hypercalls through device emulation and #VE delivery, with host-side cache timing inherent to its position on the CPU.\nPR:N - Relative to the vulnerable TDX guest, a malicious VMM needs no guest account or capabilities; TDX’s threat model treats the VMM as an external untrusted party with no authorized access to TD secrets.\nUI:N - Normal guest operation (I/O, HLT, MSR, CPUID, MAP_GPA) triggers __tdx_hypercall paths without any additional victim user action.\nS:C - TDX establishes a confidentiality boundary between guest and VMM; leaving VMM-controlled RSI available for guest speculation can leak TD memory to the VMM across that isolation boundary.\nC:H - Uncleared VMM-controlled RSI can feed speculative gadgets (e.g., as a pointer/index) and disclose arbitrary guest memory via cache side channels—the exact class of attack the register-clearing was added to prevent.\nI:N - Impact is speculative side-channel disclosure only; speculative writes do not retire, and there is no architectural memory corruption or control-flow hijack.\nA:N - The missing xor %rsi,%rsi does not cause oops, panic, hang, or other availability loss; the bug is purely a speculative-execution confidentiality mitigation gap."
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}
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]
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}
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],
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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