{ "cveId": "CVE-2026-23215", "url": "https://patchblox.com/security/cve/CVE-2026-23215", "summary": "CVE-2026-23215 is fixed in 72 products on 1 platform, first by DEBIAN-CVE-2026-23215, released February 18, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "x86/vmware: Fix hypercall clobbers", "description": "In the Linux kernel, the following vulnerability has been resolved: x86/vmware: Fix hypercall clobbers Fedora QA reported the following panic: 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 \u002B ICH9, 2009), BIOS edk2-20251119-3.fc43 11/19/2025 RIP: 0010:vmware_hypercall4.constprop.0\u002B0x52/0x90 .. Call Trace: vmmouse_report_events\u002B0x13e/0x1b0 psmouse_handle_byte\u002B0x15/0x60 ps2_interrupt\u002B0x8a/0xd0 ... 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 \u0022uint32_t data[6];\u0022 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. 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.", "published": "2026-02-18T15:18:42Z", "severity": "Important", "cvss": 8.4, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.00132, "epssPercentile": 0.02767, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23215", "fixes": [ { "platform": "linux", "product": "bpftool6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.73-95.123.amzn2023", "fix": "ALAS2023-2026-1487", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1487", "released": "2026-03-16T09:00:00Z" }, { "platform": "linux", "product": "bpftool6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.73-95.123.amzn2023", "fix": "ALAS2023-2026-1487", "url": 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