{ "cveId": "CVE-2025-68810", "url": "https://patchblox.com/security/cve/CVE-2025-68810", "summary": "CVE-2025-68810 is fixed in 73 products on 1 platform, first by DEBIAN-CVE-2025-68810, released January 13, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: KVM: Disallow toggling KVM_MEM_GUEST_MEMFD on an...", "description": "In the Linux kernel, the following vulnerability has been resolved: KVM: Disallow toggling KVM_MEM_GUEST_MEMFD on an existing memslot Reject attempts to disable KVM_MEM_GUEST_MEMFD on a memslot that was initially created with a guest_memfd binding, as KVM doesn\u0027t support toggling KVM_MEM_GUEST_MEMFD on existing memslots. KVM prevents enabling KVM_MEM_GUEST_MEMFD, but doesn\u0027t prevent clearing the flag. Failure to reject the new memslot results in a use-after-free due to KVM not unbinding from the guest_memfd instance. Unbinding on a FLAGS_ONLY change is easy enough, and can/will be done as a hardening measure (in anticipation of KVM supporting dirty logging on guest_memfd at some point), but fixing the use-after-free would only address the immediate symptom. ================================================================== BUG: KASAN: slab-use-after-free in kvm_gmem_release\u002B0x362/0x400 [kvm] Write of size 8 at addr ffff8881111ae908 by task repro/745 CPU: 7 UID: 1000 PID: 745 Comm: repro Not tainted 6.18.0-rc6-115d5de2eef3-next-kasan #3 NONE Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS 0.0.0 02/06/2015 Call Trace: \u003CTASK\u003E dump_stack_lvl\u002B0x51/0x60 print_report\u002B0xcb/0x5c0 kasan_report\u002B0xb4/0xe0 kvm_gmem_release\u002B0x362/0x400 [kvm] __fput\u002B0x2fa/0x9d0 task_work_run\u002B0x12c/0x200 do_exit\u002B0x6ae/0x2100 do_group_exit\u002B0xa8/0x230 __x64_sys_exit_group\u002B0x3a/0x50 x64_sys_call\u002B0x737/0x740 do_syscall_64\u002B0x5b/0x900 entry_SYSCALL_64_after_hwframe\u002B0x4b/0x53 RIP: 0033:0x7f581f2eac31 \u003C/TASK\u003E Allocated by task 745 on cpu 6 at 9.746971s: kasan_save_stack\u002B0x20/0x40 kasan_save_track\u002B0x13/0x50 __kasan_kmalloc\u002B0x77/0x90 kvm_set_memory_region.part.0\u002B0x652/0x1110 [kvm] kvm_vm_ioctl\u002B0x14b0/0x3290 [kvm] __x64_sys_ioctl\u002B0x129/0x1a0 do_syscall_64\u002B0x5b/0x900 entry_SYSCALL_64_after_hwframe\u002B0x4b/0x53 Freed by task 745 on cpu 6 at 9.747467s: kasan_save_stack\u002B0x20/0x40 kasan_save_track\u002B0x13/0x50 __kasan_save_free_info\u002B0x37/0x50 __kasan_slab_free\u002B0x3b/0x60 kfree\u002B0xf5/0x440 kvm_set_memslot\u002B0x3c2/0x1160 [kvm] kvm_set_memory_region.part.0\u002B0x86a/0x1110 [kvm] kvm_vm_ioctl\u002B0x14b0/0x3290 [kvm] __x64_sys_ioctl\u002B0x129/0x1a0 do_syscall_64\u002B0x5b/0x900 entry_SYSCALL_64_after_hwframe\u002B0x4b/0x53", "published": "2026-01-13T16:16:03Z", "severity": "high", "cvss": 7.8, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "epss": 0.00148, "epssPercentile": 0.04037, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "bpftool6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.64-87.122.amzn2023", "fix": "ALAS2023-2026-1423", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1423", "released": "2026-02-05T22:03:00Z" }, { "platform": "linux", "product": "bpftool6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.64-87.122.amzn2023", "fix": "ALAS2023-2026-1423", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1423", "released": "2026-02-05T22:03:00Z" }, { "platform": "linux", "product": "dtb-aarch64", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.27.1", "fix": "OPENSUSE-SU-2026:20416-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-20416-1", "released": "2026-03-25T08:49:52Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.27.1", "fix": "OPENSUSE-SU-2026:20416-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-20416-1", "released": "2026-03-25T08:49:52Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.34.1", "fix": "SUSE-SU-2026:1081-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-1081-1", "released": "2026-03-26T13:23:51Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "sles 16.0", "fixedVersion": "6.12.0-160000.27.1", "fix": "SUSE-SU-2026:20931-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-20931-1", "released": "2026-03-25T08:48:43Z" }, { "platform": "linux", "product": "kernel-azure", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.27.1", "fix": "OPENSUSE-SU-2026:20416-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-20416-1", "released": "2026-03-25T08:49:52Z" }, { 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