CVE-2026-23215
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
x86/vmware: Fix hypercall clobbers
Fedora QA reported the following panic:
because the QEMU VMware mouse emulation is buggy, and clears the top 32 bits of %rdi that the kernel kept a pointer in.
The QEMU vmmouse driver saves and restores the register state in a "uint32_t data[6];" and as a result restores the state with the high bits all cleared.
RDI originally contained the value of a valid kernel stack address (0xff5eeb3240003e54). After the vmware hypercall it now contains 0x40003e54, and we get a page fault as a result when it is dereferenced.
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The proper fix would be in QEMU, but this works around the issue in the kernel to keep old setups working, when old kernels had not happened to keep any state in %rdi over the hypercall.
In theory this same issue exists for all the hypercalls in the vmmouse driver; in practice it has only been seen with vmware_hypercall3() and vmware_hypercall4(). For now, just mark RDI/RSI as clobbered for those two calls. This should have a minimal effect on code generation overall as it should be rare for the compiler to want to make RDI/RSI live across hypercalls.
Detalles técnicos trazas, registros y código del informe original
BUG: unable to handle page fault for address: 0000000040003e54 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS edk2-20251119-3.fc43 11/19/2025 RIP: 0010:vmware_hypercall4.constprop.0+0x52/0x90 .. Call Trace: vmmouse_report_events+0x13e/0x1b0 psmouse_handle_byte+0x15/0x60 ps2_interrupt+0x8a/0xd0 ...
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.12%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/vmware: Fix hypercall clobbers\n\nFedora QA reported the following panic:\n\n BUG: unable to handle page fault for address: 0000000040003e54\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS edk2-20251119-3.fc43 11/19/2025\n RIP: 0010:vmware_hypercall4.constprop.0+0x52/0x90\n ..\n Call Trace:\n vmmouse_report_events+0x13e/0x1b0\n psmouse_handle_byte+0x15/0x60\n ps2_interrupt+0x8a/0xd0\n ...\n\nbecause the QEMU VMware mouse emulation is buggy, and clears the top 32\nbits of %rdi that the kernel kept a pointer in.\n\nThe QEMU vmmouse driver saves and restores the register state in a\n\"uint32_t data[6];\" and as a result restores the state with the high\nbits all cleared.\n\nRDI originally contained the value of a valid kernel stack address\n(0xff5eeb3240003e54). After the vmware hypercall it now contains\n0x40003e54, and we get a page fault as a result when it is dereferenced.\n\nThe proper fix would be in QEMU, but this works around the issue in the\nkernel to keep old setups working, when old kernels had not happened to\nkeep any state in %rdi over the hypercall.\n\nIn theory this same issue exists for all the hypercalls in the vmmouse\ndriver; in practice it has only been seen with vmware_hypercall3() and\nvmware_hypercall4(). For now, just mark RDI/RSI as clobbered for those\ntwo calls. This should have a minimal effect on code generation overall\nas it should be rare for the compiler to want to make RDI/RSI live\nacross hypercalls."
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"lastModified": "2026-06-17T10:21:07.010",
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