{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.19.14-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  KVM: SEV: Protect *all* of sev_mem_enc_register_region() with kvm-\u003elock  Take and hold kvm-\u003elock for before checking sev_guest() in sev_mem_enc_register_region(), as sev_guest() isn't stable unless kvm-\u003elock is held (or KVM can guarantee KVM_SEV_INIT{2} has completed and can't rollack state).  If KVM_SEV_INIT{2} fails, KVM can end up trying to add to a not-yet-initialized sev-\u003eregions_list, e.g. triggering a #GP    Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI   KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]   CPU: 110 UID: 0 PID: 72717 Comm: syz.15.11462 Tainted: G     U  W  O        6.16.0-smp-DEV #1 NONE   Tainted: [U]=USER, [W]=WARN, [O]=OOT_MODULE   Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.52.0-0 10/28/2024   RIP: 0010:sev_mem_enc_register_region+0x3f0/0x4f0 ../include/linux/list.h:83   Code: \u003c41\u003e 80 3c 04 00 74 08 4c 89 ff e8 f1 c7 a2 00 49 39 ed 0f 84 c6 00   RSP: 0018:ffff88838647fbb8 EFLAGS: 00010256   RAX: dffffc0000000000 RBX: 1ffff92015cf1e0b RCX: dffffc0000000000   RDX: 0000000000000000 RSI: 0000000000001000 RDI: ffff888367870000   RBP: ffffc900ae78f050 R08: ffffea000d9e0007 R09: 1ffffd4001b3c000   R10: dffffc0000000000 R11: fffff94001b3c001 R12: 0000000000000000   R13: ffff8982ab0bde00 R14: ffffc900ae78f058 R15: 0000000000000000   FS:  00007f34e9dc66c0(0000) GS:ffff89ee64d33000(0000) knlGS:0000000000000000   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033   CR2: 00007fe180adef98 CR3: 000000047210e000 CR4: 0000000000350ef0   Call Trace:    \u003cTASK\u003e    kvm_arch_vm_ioctl+0xa72/0x1240 ../arch/x86/kvm/x86.c:7371    kvm_vm_ioctl+0x649/0x990 ../virt/kvm/kvm_main.c:5363    __se_sys_ioctl+0x101/0x170 ../fs/ioctl.c:51    do_syscall_x64 ../arch/x86/entry/syscall_64.c:63 [inline]    do_syscall_64+0x6f/0x1f0 ../arch/x86/entry/syscall_64.c:94    entry_SYSCALL_64_after_hwframe+0x76/0x7e   RIP: 0033:0x7f34e9f7e9a9   Code: \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48   RSP: 002b:00007f34e9dc6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010   RAX: ffffffffffffffda RBX: 00007f34ea1a6080 RCX: 00007f34e9f7e9a9   RDX: 0000200000000280 RSI: 000000008010aebb RDI: 0000000000000007   RBP: 00007f34ea000d69 R08: 0000000000000000 R09: 0000000000000000   R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000   R13: 0000000000000000 R14: 00007f34ea1a6080 R15: 00007ffce77197a8    \u003c/TASK\u003e  with a syzlang reproducer that looks like:    syz_kvm_add_vcpu$x86(0x0, \u0026(0x7f0000000040)={0x0, \u0026(0x7f0000000180)=ANY=[], 0x70}) (async)   syz_kvm_add_vcpu$x86(0x0, \u0026(0x7f0000000080)={0x0, \u0026(0x7f0000000180)=ANY=[@ANYBLOB=\"...\"], 0x4f}) (async)   r0 = openat$kvm(0xffffffffffffff9c, \u0026(0x7f0000000200), 0x0, 0x0)   r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0)   r2 = openat$kvm(0xffffffffffffff9c, \u0026(0x7f0000000240), 0x0, 0x0)   r3 = ioctl$KVM_CREATE_VM(r2, 0xae01, 0x0)   ioctl$KVM_SET_CLOCK(r3, 0xc008aeba, \u0026(0x7f0000000040)={0x1, 0x8, 0x0, 0x5625e9b0}) (async)   ioctl$KVM_SET_PIT2(r3, 0x8010aebb, \u0026(0x7f0000000280)={[...], 0x5}) (async)   ioctl$KVM_SET_PIT2(r1, 0x4070aea0, 0x0) (async)   r4 = ioctl$KVM_CREATE_VM(0xffffffffffffffff, 0xae01, 0x0)   openat$kvm(0xffffffffffffff9c, 0x0, 0x0, 0x0) (async)   ioctl$KVM_SET_USER_MEMORY_REGION(r4, 0x4020ae46, \u0026(0x7f0000000400)={0x0, 0x0, 0x0, 0x2000, \u0026(0x7f0000001000/0x2000)=nil}) (async)   r5 = ioctl$KVM_CREATE_VCPU(r4, 0xae41, 0x2)   close(r0) (async)   openat$kvm(0xffffffffffffff9c, \u0026(0x7f0000000000), 0x8000, 0x0) (async)   ioctl$KVM_SET_GUEST_DEBUG(r5, 0x4048ae9b, \u0026(0x7f0000000300)={0x4376ea830d46549b, 0x0, [0x46, 0x0, 0x0, 0x0, 0x0, 0x1000]}) (async)   ioctl$KVM_RUN(r5, 0xae80, 0x0)  Opportunistically use guard() to avoid having to define a new error label and goto usage.",
  "id": "DEBIAN-CVE-2026-31592",
  "modified": "2026-09-14T16:47:38.863125160Z",
  "published": "2026-04-24T15:16:36.667Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-31592"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-31592"
  ]
}