{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.187-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.105-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.9-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux-6.12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.107-1~deb12u1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  KVM: x86/mmu: WARN and clear role.invalid when creating a child shadow page  Explicitly clear role.invalid when deriving a child shadow page's role from its parent to harden against bugs elsewhere in KVM, as violating KVM's invariant that invalid pages are NOT on the list of active MMU pages leads to use-after-free due to __kvm_mmu_prepare_zap_page() using list_add() instead of list_move() when processing an invalid shadow page, i.e. makes a bad situation far worse.  Yell loudly if the parent is invalid, as it means KVM has missed a validity check, i.e. KVM is attempting to map memory using an invalid/obsolete root, but continue on as the child is otherwise still a valid shadow page.    ==================================================================   BUG: KASAN: slab-use-after-free in __kvm_mmu_get_shadow_page+0x1817/0x1860 [kvm]   Write of size 8 at addr ff11000153dd1368 by task repro/853    CPU: 1 UID: 1000 PID: 853 Comm: repro Not tainted 7.2.0-rc2-3aec122bdcaf-next-vm #5 PREEMPT   Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015   Call Trace:    \u003cTASK\u003e    dump_stack_lvl+0x4b/0x70    print_report+0x153/0x49c    kasan_report+0xbc/0xf0    __kvm_mmu_get_shadow_page+0x1817/0x1860 [kvm]    mmu_alloc_root+0x141/0x320 [kvm]    kvm_mmu_load+0x612/0x20f0 [kvm]    kvm_arch_vcpu_ioctl_run+0x3dd5/0x6150 [kvm]    kvm_vcpu_ioctl+0x5e4/0x10d0 [kvm]    __x64_sys_ioctl+0x131/0x1b0    do_syscall_64+0x67/0x5f0    entry_SYSCALL_64_after_hwframe+0x4b/0x53    \u003c/TASK\u003e    Allocated by task 853:    kasan_save_stack+0x20/0x40    kasan_save_track+0x14/0x30    __kasan_slab_alloc+0x5f/0x70    kmem_cache_alloc_noprof+0xfe/0x2e0    __kvm_mmu_topup_memory_cache+0x135/0x530 [kvm]    paging64_page_fault+0x318/0x1e30 [kvm]    kvm_mmu_do_page_fault+0x21d/0x630 [kvm]    kvm_mmu_page_fault+0x18c/0x17b0 [kvm]    kvm_arch_vcpu_ioctl_run+0x1f35/0x6150 [kvm]    kvm_vcpu_ioctl+0x5e4/0x10d0 [kvm]    __x64_sys_ioctl+0x131/0x1b0    do_syscall_64+0x67/0x5f0    entry_SYSCALL_64_after_hwframe+0x4b/0x53    Freed by task 853:    kasan_save_stack+0x20/0x40    kasan_save_track+0x14/0x30    kasan_save_free_info+0x3b/0x60    __kasan_slab_free+0x43/0x70    kmem_cache_free+0xe2/0x400    kvm_mmu_commit_zap_page.part.0+0x1e2/0x310 [kvm]    kvm_mmu_free_roots+0x283/0x560 [kvm]    kvm_arch_vcpu_ioctl_run+0x33c8/0x6150 [kvm]    kvm_vcpu_ioctl+0x5e4/0x10d0 [kvm]    __x64_sys_ioctl+0x131/0x1b0    do_syscall_64+0x67/0x5f0    entry_SYSCALL_64_after_hwframe+0x4b/0x53",
  "id": "DEBIAN-CVE-2026-80726",
  "modified": "2026-09-19T21:47:28.541417461Z",
  "published": "2026-09-03T13:06:11.020Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-80726"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-80726"
  ]
}