{"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": "2026-04-24T14:42:18.921Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-04-24T14:42:18.921Z"}, "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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "35a0963d361f98bba798fd15d229dcb166c04684", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "ab725ac3022469ecd4d7aa7d5646712e98b249d8", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "0ff93ff0ba82e9511770e175fa50682a1ab14fb6", "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": "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"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.18.24"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.19.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "7.0.1"}]}]}], "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"}], "title": "KVM: SEV: Protect *all* of sev_mem_enc_register_region() with kvm->lock", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "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."}], "id": "CVE-2026-31592", "lastModified": "2026-04-24T17:51:40.810", "metrics": {}, "published": "2026-04-24T15:16:36.667", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0ff93ff0ba82e9511770e175fa50682a1ab14fb6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/35a0963d361f98bba798fd15d229dcb166c04684"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ab725ac3022469ecd4d7aa7d5646712e98b249d8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: KVM: SEV: Protect *all* of sev_mem_enc_register_region() with kvm->lock", "id": "2461501", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461501"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-413", "details": ["A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem. A local user could exploit a concurrency issue by failing to properly protect the `sev_mem_enc_register_region()` function with the `kvm->lock`. This can lead to an unstable state if KVM initialization fails, resulting in a general protection fault and a null-pointer dereference. The most important consequence is a denial of service, causing the system to crash."], "name": "CVE-2026-31592", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31592\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31592\nhttps://lore.kernel.org/linux-cve-announce/2026042415-CVE-2026-31592-954a@gregkh/T"], "threat_severity": "Moderate"}

{}