{ "document": { "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/debian10els/vex/2026/cve-2026-63806-els_os-debian10els.json" } ], "tracking": { "current_release_date": "2026-08-25T12:53:37Z", "generator": { "date": "2026-08-25T12:53:37Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-63806-ELS_OS-DEBIAN10ELS", "initial_release_date": "2026-07-19T12:16:00Z", "revision_history": [ { "date": "2026-07-19T12:16:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-08-25T12:53:37Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security update on 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} } } ], "category": "architecture", "name": "all" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64" }, "product_reference": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64" }, "product_reference": "linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "libcpupower1-0:4.19.325-1+tuxcare.els1.amd64 as a component of Debian 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"category": "default_component_of", "full_product_name": { "name": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64" }, "product_reference": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "relates_to_product_reference": "Debian-10" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-63806", "cwe": { "id": "CWE-617", "name": "Reachable Assertion" }, "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned()\n\nDrop a BUG_ON() that has been reachable since it was first added, way back\nin 2009, and instead use get_unaligned() to perform potentially-unaligned\naccesses.\n\nFor a given store, KVM x86's emulator tracks the entire value in the\ndestination operand, x86_emulate_ctxt.dst. If the destination is memory,\nand the target splits multiple pages and/or is emulated MMIO, then KVM\nhandles each fragment independently. E.g. on a page split starting at page\noffset 0xffc, KVM writes 4 bytes to the first page, then the remaining\nbytes to the second page, using ctxt->dst as the source for both (with\nappropriate offsets).\n\nIf the destination splits a page *and* hits emulated MMIO on the second\npage, then KVM will complete the write to the first page, then emulate the\nMMIO access to the second page. If there is a datamatch-enabled ioeventfd\nat offset 0 of the second page, then KVM will process the remainder of the\nstore as a potential ioeventfd signal.\n\nPutting it all together, if the guest emits a store that splits a page\nstarting at page offset N, and the second page has a datamatch-enabled\nioeventfd at offset 0, then KVM will check for datamatch using\n&dst.valptr[N] as the source. Due to dst (and thus dst.valptr) being\n32-byte aligned, if N is not aligned to @len, the BUG_ON() fires.\n\nE.g. with a 16-byte store at page offset 0xffc, to an ioeventfd of len 8,\nall initial checks in ioeventfd_in_range() will succeed, and the BUG_ON()\nfires due to @val being 4-byte aligned, but not 8-byte aligned.\n\n ------------[ cut here ]------------\n kernel BUG at arch/x86/kvm/../../../virt/kvm/eventfd.c:783!\n Oops: invalid opcode: 0000 [#1] SMP\n CPU: 0 UID: 1000 PID: 615 Comm: repro Not tainted 7.1.0-rc2-ff238429d1ea #365 PREEMPT\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n RIP: 0010:ioeventfd_write+0x6c/0x70 [kvm]\n Call Trace:\n \n __kvm_io_bus_write+0x85/0xb0 [kvm]\n kvm_io_bus_write+0x53/0x80 [kvm]\n vcpu_mmio_write+0x66/0xf0 [kvm]\n emulator_read_write_onepage+0x12a/0x540 [kvm]\n emulator_read_write+0x109/0x2b0 [kvm]\n x86_emulate_insn+0x4f8/0xfb0 [kvm]\n x86_emulate_instruction+0x181/0x790 [kvm]\n kvm_mmu_page_fault+0x313/0x630 [kvm]\n vmx_handle_exit+0x18a/0x590 [kvm_intel]\n kvm_arch_vcpu_ioctl_run+0xc81/0x1c90 [kvm]\n kvm_vcpu_ioctl+0x2d5/0x970 [kvm]\n __x64_sys_ioctl+0x8a/0xd0\n do_syscall_64+0xb7/0x890\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n RIP: 0033:0x7f19c931a9bf\n \n Modules linked in: kvm_intel kvm irqbypass\n ---[ end trace 0000000000000000 ]---\n\nIn a perfect world, the fix would be to simply delete the BUG_ON(), as KVM\nx86 doesn't perform alignment checks on \"normal\" memory accesses at CPL0.\nSadly, C99 ruins all the fun; while the x86 architecture plays nice,\ndereferencing an unaligned pointer directly is undefined behavior in C,\ne.g. triggers splats when running with CONFIG_UBSAN_ALIGNMENT=y.", "title": "Vulnerability description" } ], "product_status": { "under_investigation": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63806" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/2426c15c1395b7d5ccf1e5025ca898af7f3decb6", "url": "https://git.kernel.org/stable/c/2426c15c1395b7d5ccf1e5025ca898af7f3decb6" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/36ff44fb3d89960391e013fb9d91e23dbc48be47", "url": "https://git.kernel.org/stable/c/36ff44fb3d89960391e013fb9d91e23dbc48be47" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/4186c850789906b875a1d263377a4d37c078e317", "url": "https://git.kernel.org/stable/c/4186c850789906b875a1d263377a4d37c078e317" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/5c87b47374682f69686068ad0a7779365a527b1c", "url": "https://git.kernel.org/stable/c/5c87b47374682f69686068ad0a7779365a527b1c" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/5da9b1a87ec7cc3489c27016313524769f12d9e0", "url": "https://git.kernel.org/stable/c/5da9b1a87ec7cc3489c27016313524769f12d9e0" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/92fc631b69deb1c7d56aec2663003600799dcd75", "url": "https://git.kernel.org/stable/c/92fc631b69deb1c7d56aec2663003600799dcd75" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/bf89e3738480d33cd515b4a18900e8443d40cd2e", "url": "https://git.kernel.org/stable/c/bf89e3738480d33cd515b4a18900e8443d40cd2e" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/f1edbed787ba67988ed34e0132ca128b052b6ce8", "url": "https://git.kernel.org/stable/c/f1edbed787ba67988ed34e0132ca128b052b6ce8" } ], "release_date": "2026-07-19T12:16:00Z", "remediations": [ { "category": "none_available", "date": "2026-08-17T12:10:59.053959Z", "details": "Affected", "product_ids": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] } ] } ] }