{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31592","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.121Z","datePublished":"2026-04-24T14:42:18.921Z","dateUpdated":"2026-05-11T22:11:46.315Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:11:46.315Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Protect *all* of sev_mem_enc_register_region() with kvm->lock\n\nTake and hold kvm->lock for before checking sev_guest() in\nsev_mem_enc_register_region(), as sev_guest() isn't stable unless kvm->lock\nis held (or KVM can guarantee KVM_SEV_INIT{2} has completed and can't\nrollack state).  If KVM_SEV_INIT{2} fails, KVM can end up trying to add to\na not-yet-initialized sev->regions_list, e.g. triggering a #GP\n\n  Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  CPU: 110 UID: 0 PID: 72717 Comm: syz.15.11462 Tainted: G     U  W  O        6.16.0-smp-DEV #1 NONE\n  Tainted: [U]=USER, [W]=WARN, [O]=OOT_MODULE\n  Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.52.0-0 10/28/2024\n  RIP: 0010:sev_mem_enc_register_region+0x3f0/0x4f0 ../include/linux/list.h:83\n  Code: <41> 80 3c 04 00 74 08 4c 89 ff e8 f1 c7 a2 00 49 39 ed 0f 84 c6 00\n  RSP: 0018:ffff88838647fbb8 EFLAGS: 00010256\n  RAX: dffffc0000000000 RBX: 1ffff92015cf1e0b RCX: dffffc0000000000\n  RDX: 0000000000000000 RSI: 0000000000001000 RDI: ffff888367870000\n  RBP: ffffc900ae78f050 R08: ffffea000d9e0007 R09: 1ffffd4001b3c000\n  R10: dffffc0000000000 R11: fffff94001b3c001 R12: 0000000000000000\n  R13: ffff8982ab0bde00 R14: ffffc900ae78f058 R15: 0000000000000000\n  FS:  00007f34e9dc66c0(0000) GS:ffff89ee64d33000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007fe180adef98 CR3: 000000047210e000 CR4: 0000000000350ef0\n  Call Trace:\n   <TASK>\n   kvm_arch_vm_ioctl+0xa72/0x1240 ../arch/x86/kvm/x86.c:7371\n   kvm_vm_ioctl+0x649/0x990 ../virt/kvm/kvm_main.c:5363\n   __se_sys_ioctl+0x101/0x170 ../fs/ioctl.c:51\n   do_syscall_x64 ../arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0x6f/0x1f0 ../arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  RIP: 0033:0x7f34e9f7e9a9\n  Code: <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48\n  RSP: 002b:00007f34e9dc6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\n  RAX: ffffffffffffffda RBX: 00007f34ea1a6080 RCX: 00007f34e9f7e9a9\n  RDX: 0000200000000280 RSI: 000000008010aebb RDI: 0000000000000007\n  RBP: 00007f34ea000d69 R08: 0000000000000000 R09: 0000000000000000\n  R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\n  R13: 0000000000000000 R14: 00007f34ea1a6080 R15: 00007ffce77197a8\n   </TASK>\n\nwith a syzlang reproducer that looks like:\n\n  syz_kvm_add_vcpu$x86(0x0, &(0x7f0000000040)={0x0, &(0x7f0000000180)=ANY=[], 0x70}) (async)\n  syz_kvm_add_vcpu$x86(0x0, &(0x7f0000000080)={0x0, &(0x7f0000000180)=ANY=[@ANYBLOB=\"...\"], 0x4f}) (async)\n  r0 = openat$kvm(0xffffffffffffff9c, &(0x7f0000000200), 0x0, 0x0)\n  r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0)\n  r2 = openat$kvm(0xffffffffffffff9c, &(0x7f0000000240), 0x0, 0x0)\n  r3 = ioctl$KVM_CREATE_VM(r2, 0xae01, 0x0)\n  ioctl$KVM_SET_CLOCK(r3, 0xc008aeba, &(0x7f0000000040)={0x1, 0x8, 0x0, 0x5625e9b0}) (async)\n  ioctl$KVM_SET_PIT2(r3, 0x8010aebb, &(0x7f0000000280)={[...], 0x5}) (async)\n  ioctl$KVM_SET_PIT2(r1, 0x4070aea0, 0x0) (async)\n  r4 = ioctl$KVM_CREATE_VM(0xffffffffffffffff, 0xae01, 0x0)\n  openat$kvm(0xffffffffffffff9c, 0x0, 0x0, 0x0) (async)\n  ioctl$KVM_SET_USER_MEMORY_REGION(r4, 0x4020ae46, &(0x7f0000000400)={0x0, 0x0, 0x0, 0x2000, &(0x7f0000001000/0x2000)=nil}) (async)\n  r5 = ioctl$KVM_CREATE_VCPU(r4, 0xae41, 0x2)\n  close(r0) (async)\n  openat$kvm(0xffffffffffffff9c, &(0x7f0000000000), 0x8000, 0x0) (async)\n  ioctl$KVM_SET_GUEST_DEBUG(r5, 0x4048ae9b, &(0x7f0000000300)={0x4376ea830d46549b, 0x0, [0x46, 0x0, 0x0, 0x0, 0x0, 0x1000]}) (async)\n  ioctl$KVM_RUN(r5, 0xae80, 0x0)\n\nOpportunistically use guard() to avoid having to define a new error label\nand goto usage."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/sev.c"],"versions":[{"version":"1e80fdc09d121d8327cdf62eefbb5abadddca792","lessThan":"35a0963d361f98bba798fd15d229dcb166c04684","status":"affected","versionType":"git"},{"version":"1e80fdc09d121d8327cdf62eefbb5abadddca792","lessThan":"ab725ac3022469ecd4d7aa7d5646712e98b249d8","status":"affected","versionType":"git"},{"version":"1e80fdc09d121d8327cdf62eefbb5abadddca792","lessThan":"0ff93ff0ba82e9511770e175fa50682a1ab14fb6","status":"affected","versionType":"git"},{"version":"1e80fdc09d121d8327cdf62eefbb5abadddca792","lessThan":"b6408b6cec5df76a165575777800ef2aba12b109","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/sev.c"],"versions":[{"version":"4.16","status":"affected"},{"version":"0","lessThan":"4.16","status":"unaffected","versionType":"semver"},{"version":"6.18.24","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.14","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0.1","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1-rc1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.18.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.19.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"7.0.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"7.1-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/35a0963d361f98bba798fd15d229dcb166c04684"},{"url":"https://git.kernel.org/stable/c/ab725ac3022469ecd4d7aa7d5646712e98b249d8"},{"url":"https://git.kernel.org/stable/c/0ff93ff0ba82e9511770e175fa50682a1ab14fb6"},{"url":"https://git.kernel.org/stable/c/b6408b6cec5df76a165575777800ef2aba12b109"}],"title":"KVM: SEV: Protect *all* of sev_mem_enc_register_region() with kvm->lock","x_generator":{"engine":"bippy-1.2.0"}}}}