GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-63794 (GCVE-0-2026-63794)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-08-17 04:50
VLAI
Title
KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path In sev_dbg_crypt(), the per-iteration transfer length is bounded by the source page offset (PAGE_SIZE - s_off) but not by the destination page offset (PAGE_SIZE - d_off). When d_off > s_off, the encrypt path (__sev_dbg_encrypt_user) performs a read-modify-write using a single-page intermediate buffer (dst_tpage): 1. __sev_dbg_decrypt() expands the size to round_up(len + (d_off & 15), 16) before issuing the PSP command. If len + (d_off & 15) > PAGE_SIZE, the PSP writes beyond the end of the 4096-byte dst_tpage allocation. 2. The subsequent memcpy()/copy_from_user() into page_address(dst_tpage) + (d_off & 15) of 'len' bytes overflows by up to 15 bytes under the same condition. Trigger example: s_off = 0, d_off = 1, debug.len = PAGE_SIZE - the PSP is instructed to write round_up(4097, 16) = 4112 bytes to a 4096-byte buffer. Fix by also bounding len by (PAGE_SIZE - d_off), the same check that sev_send_update_data() already performs for its single-page guest region. ================================================================== BUG: KASAN: slab-use-after-free in sev_dbg_crypt+0x993/0xd10 [kvm_amd] Write of size 4095 at addr ff110062293bb009 by task sev_dbg_test/228214 CPU: 96 UID: 0 PID: 228214 Comm: sev_dbg_test Tainted: G U W 7.0.0-smp--5ce9b0c48211-dbg #156 PREEMPTLAZY Tainted: [U]=USER, [W]=WARN Hardware name: Google Astoria/astoria, BIOS 0.20250817.1-0 08/25/2025 Call Trace: <TASK> dump_stack_lvl+0x54/0x70 print_report+0xbc/0x260 kasan_report+0xa2/0xd0 kasan_check_range+0x25f/0x2c0 __asan_memcpy+0x40/0x70 sev_dbg_crypt+0x993/0xd10 [kvm_amd] sev_mem_enc_ioctl+0x33c/0x450 [kvm_amd] kvm_vm_ioctl+0x65d/0x6d0 [kvm] __se_sys_ioctl+0xb2/0x100 do_syscall_64+0xe8/0x870 entry_SYSCALL_64_after_hwframe+0x4b/0x53 </TASK> The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x7fe72b6a0 pfn:0x62293bb memcg:ff11000112827d82 flags: 0x1400000000000000(node=1|zone=1) raw: 1400000000000000 0000000000000000 dead000000000122 0000000000000000 raw: 00000007fe72b6a0 0000000000000000 00000001ffffffff ff11000112827d82 page dumped because: kasan: bad access detected Memory state around the buggy address: ff110062293bbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff110062293bbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ff110062293bc000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ff110062293bc080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ff110062293bc100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== Disabling lock debugging due to kernel taint [sean: add sample KASAN splat, Fixes, and stable@]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < f701ae476cb92a3a3d8844bb39bb63b4512684c8 (git)
Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < 64f2449841ffc7d203183aa4c748c9c77951ecc5 (git)
Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < 9349b50f4b11f135fe73b56cb2c2c872d8bc71d7 (git)
Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < 889c2a9c59897ca912bf39df5bb92555a0a13df4 (git)
Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < e1a0fe288dee07b7da25a71e007c1ecd1080315b (git)
Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < 720949ed666f34ff28ffdfe1471a5861d1e41fdf (git)
Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < 2753a097d1fe24c4351c608048612c74108aa89f (git)
Affected: 24f41fb23a39bc2b6f190dcef35a5813a4bf183a , < 78ee2d50185a037b3d2452a97f3dad69c3f7f389 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/sev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f701ae476cb92a3a3d8844bb39bb63b4512684c8",
              "status": "affected",
              "version": "24f41fb23a39bc2b6f190dcef35a5813a4bf183a",
              "versionType": "git"
            },
            {
              "lessThan": "64f2449841ffc7d203183aa4c748c9c77951ecc5",
              "status": "affected",
              "version": "24f41fb23a39bc2b6f190dcef35a5813a4bf183a",
              "versionType": "git"
            },
            {
              "lessThan": "9349b50f4b11f135fe73b56cb2c2c872d8bc71d7",
              "status": "affected",
              "version": "24f41fb23a39bc2b6f190dcef35a5813a4bf183a",
              "versionType": "git"
            },
            {
              "lessThan": "889c2a9c59897ca912bf39df5bb92555a0a13df4",
              "status": "affected",
              "version": "24f41fb23a39bc2b6f190dcef35a5813a4bf183a",
              "versionType": "git"
            },
            {
              "lessThan": "e1a0fe288dee07b7da25a71e007c1ecd1080315b",
              "status": "affected",
              "version": "24f41fb23a39bc2b6f190dcef35a5813a4bf183a",
              "versionType": "git"
            },
            {
              "lessThan": "720949ed666f34ff28ffdfe1471a5861d1e41fdf",
              "status": "affected",
              "version": "24f41fb23a39bc2b6f190dcef35a5813a4bf183a",
              "versionType": "git"
            },
            {
              "lessThan": "2753a097d1fe24c4351c608048612c74108aa89f",
              "status": "affected",
              "version": "24f41fb23a39bc2b6f190dcef35a5813a4bf183a",
              "versionType": "git"
            },
            {
              "lessThan": "78ee2d50185a037b3d2452a97f3dad69c3f7f389",
              "status": "affected",
              "version": "24f41fb23a39bc2b6f190dcef35a5813a4bf183a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/sev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.16"
            },
            {
              "lessThan": "4.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.260",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.211",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.177",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.38",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.260",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.211",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.177",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.144",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.95",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.38",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.3",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path\n\nIn sev_dbg_crypt(), the per-iteration transfer length is bounded by\nthe source page offset (PAGE_SIZE - s_off) but not by the destination\npage offset (PAGE_SIZE - d_off).  When d_off \u003e s_off, the encrypt\npath (__sev_dbg_encrypt_user) performs a read-modify-write using a\nsingle-page intermediate buffer (dst_tpage):\n\n  1. __sev_dbg_decrypt() expands the size to round_up(len + (d_off \u0026 15), 16)\n     before issuing the PSP command.  If len + (d_off \u0026 15) \u003e PAGE_SIZE,\n     the PSP writes beyond the end of the 4096-byte dst_tpage allocation.\n\n  2. The subsequent memcpy()/copy_from_user() into\n     page_address(dst_tpage) + (d_off \u0026 15) of \u0027len\u0027 bytes overflows\n     by up to 15 bytes under the same condition.\n\nTrigger example: s_off = 0, d_off = 1, debug.len = PAGE_SIZE -\nthe PSP is instructed to write round_up(4097, 16) = 4112 bytes to\na 4096-byte buffer.\n\nFix by also bounding len by (PAGE_SIZE - d_off), the same check that\nsev_send_update_data() already performs for its single-page guest\nregion.\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in sev_dbg_crypt+0x993/0xd10 [kvm_amd]\n Write of size 4095 at addr ff110062293bb009 by task sev_dbg_test/228214\n\n CPU: 96 UID: 0 PID: 228214 Comm: sev_dbg_test Tainted: G     U  W           7.0.0-smp--5ce9b0c48211-dbg #156 PREEMPTLAZY\n Tainted: [U]=USER, [W]=WARN\n Hardware name: Google Astoria/astoria, BIOS 0.20250817.1-0 08/25/2025\n Call Trace:\n  \u003cTASK\u003e\n  dump_stack_lvl+0x54/0x70\n  print_report+0xbc/0x260\n  kasan_report+0xa2/0xd0\n  kasan_check_range+0x25f/0x2c0\n  __asan_memcpy+0x40/0x70\n  sev_dbg_crypt+0x993/0xd10 [kvm_amd]\n  sev_mem_enc_ioctl+0x33c/0x450 [kvm_amd]\n  kvm_vm_ioctl+0x65d/0x6d0 [kvm]\n  __se_sys_ioctl+0xb2/0x100\n  do_syscall_64+0xe8/0x870\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n  \u003c/TASK\u003e\n\n The buggy address belongs to the physical page:\n page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x7fe72b6a0 pfn:0x62293bb\n memcg:ff11000112827d82\n flags: 0x1400000000000000(node=1|zone=1)\n raw: 1400000000000000 0000000000000000 dead000000000122 0000000000000000\n raw: 00000007fe72b6a0 0000000000000000 00000001ffffffff ff11000112827d82\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n  ff110062293bbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ff110062293bbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n \u003eff110062293bc000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\n                    ^\n  ff110062293bc080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\n  ff110062293bc100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\n ==================================================================\n Disabling lock debugging due to kernel taint\n\n[sean: add sample KASAN splat, Fixes, and stable@]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:50:58.924Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f701ae476cb92a3a3d8844bb39bb63b4512684c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/64f2449841ffc7d203183aa4c748c9c77951ecc5"
        },
        {
          "url": "https://git.kernel.org/stable/c/9349b50f4b11f135fe73b56cb2c2c872d8bc71d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/889c2a9c59897ca912bf39df5bb92555a0a13df4"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1a0fe288dee07b7da25a71e007c1ecd1080315b"
        },
        {
          "url": "https://git.kernel.org/stable/c/720949ed666f34ff28ffdfe1471a5861d1e41fdf"
        },
        {
          "url": "https://git.kernel.org/stable/c/2753a097d1fe24c4351c608048612c74108aa89f"
        },
        {
          "url": "https://git.kernel.org/stable/c/78ee2d50185a037b3d2452a97f3dad69c3f7f389"
        }
      ],
      "title": "KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63794",
    "datePublished": "2026-07-19T12:02:03.488Z",
    "dateReserved": "2026-07-19T07:54:57.012Z",
    "dateUpdated": "2026-08-17T04:50:58.924Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63794",
      "date": "2026-09-16",
      "epss": "0.00142",
      "percentile": "0.03874"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-14T18:31:17.000Z",
      "cve": "CVE-2026-63794",
      "id": "msrc_CVE-2026-63794",
      "initial_release_date": "2026-07-20T01:05:46.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63794.json",
      "version": "8"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63794\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T12:16:51.757\",\"lastModified\":\"2026-08-17T05:17:15.500\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path\\n\\nIn sev_dbg_crypt(), the per-iteration transfer length is bounded by\\nthe source page offset (PAGE_SIZE - s_off) but not by the destination\\npage offset (PAGE_SIZE - d_off).  When d_off \u003e s_off, the encrypt\\npath (__sev_dbg_encrypt_user) performs a read-modify-write using a\\nsingle-page intermediate buffer (dst_tpage):\\n\\n  1. __sev_dbg_decrypt() expands the size to round_up(len + (d_off \u0026 15), 16)\\n     before issuing the PSP command.  If len + (d_off \u0026 15) \u003e PAGE_SIZE,\\n     the PSP writes beyond the end of the 4096-byte dst_tpage allocation.\\n\\n  2. The subsequent memcpy()/copy_from_user() into\\n     page_address(dst_tpage) + (d_off \u0026 15) of \u0027len\u0027 bytes overflows\\n     by up to 15 bytes under the same condition.\\n\\nTrigger example: s_off = 0, d_off = 1, debug.len = PAGE_SIZE -\\nthe PSP is instructed to write round_up(4097, 16) = 4112 bytes to\\na 4096-byte buffer.\\n\\nFix by also bounding len by (PAGE_SIZE - d_off), the same check that\\nsev_send_update_data() already performs for its single-page guest\\nregion.\\n\\n ==================================================================\\n BUG: KASAN: slab-use-after-free in sev_dbg_crypt+0x993/0xd10 [kvm_amd]\\n Write of size 4095 at addr ff110062293bb009 by task sev_dbg_test/228214\\n\\n CPU: 96 UID: 0 PID: 228214 Comm: sev_dbg_test Tainted: G     U  W           7.0.0-smp--5ce9b0c48211-dbg #156 PREEMPTLAZY\\n Tainted: [U]=USER, [W]=WARN\\n Hardware name: Google Astoria/astoria, BIOS 0.20250817.1-0 08/25/2025\\n Call Trace:\\n  \u003cTASK\u003e\\n  dump_stack_lvl+0x54/0x70\\n  print_report+0xbc/0x260\\n  kasan_report+0xa2/0xd0\\n  kasan_check_range+0x25f/0x2c0\\n  __asan_memcpy+0x40/0x70\\n  sev_dbg_crypt+0x993/0xd10 [kvm_amd]\\n  sev_mem_enc_ioctl+0x33c/0x450 [kvm_amd]\\n  kvm_vm_ioctl+0x65d/0x6d0 [kvm]\\n  __se_sys_ioctl+0xb2/0x100\\n  do_syscall_64+0xe8/0x870\\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\\n  \u003c/TASK\u003e\\n\\n The buggy address belongs to the physical page:\\n page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x7fe72b6a0 pfn:0x62293bb\\n memcg:ff11000112827d82\\n flags: 0x1400000000000000(node=1|zone=1)\\n raw: 1400000000000000 0000000000000000 dead000000000122 0000000000000000\\n raw: 00000007fe72b6a0 0000000000000000 00000001ffffffff ff11000112827d82\\n page dumped because: kasan: bad access detected\\n\\n Memory state around the buggy address:\\n  ff110062293bbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n  ff110062293bbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n \u003eff110062293bc000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\\n                    ^\\n  ff110062293bc080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\\n  ff110062293bc100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\\n ==================================================================\\n Disabling lock debugging due to kernel taint\\n\\n[sean: add sample KASAN splat, Fixes, and stable@]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/x86/kvm/svm/sev.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"24f41fb23a39bc2b6f190dcef35a5813a4bf183a\",\"lessThan\":\"f701ae476cb92a3a3d8844bb39bb63b4512684c8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24f41fb23a39bc2b6f190dcef35a5813a4bf183a\",\"lessThan\":\"64f2449841ffc7d203183aa4c748c9c77951ecc5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24f41fb23a39bc2b6f190dcef35a5813a4bf183a\",\"lessThan\":\"9349b50f4b11f135fe73b56cb2c2c872d8bc71d7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24f41fb23a39bc2b6f190dcef35a5813a4bf183a\",\"lessThan\":\"889c2a9c59897ca912bf39df5bb92555a0a13df4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24f41fb23a39bc2b6f190dcef35a5813a4bf183a\",\"lessThan\":\"e1a0fe288dee07b7da25a71e007c1ecd1080315b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24f41fb23a39bc2b6f190dcef35a5813a4bf183a\",\"lessThan\":\"720949ed666f34ff28ffdfe1471a5861d1e41fdf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24f41fb23a39bc2b6f190dcef35a5813a4bf183a\",\"lessThan\":\"2753a097d1fe24c4351c608048612c74108aa89f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24f41fb23a39bc2b6f190dcef35a5813a4bf183a\",\"lessThan\":\"78ee2d50185a037b3d2452a97f3dad69c3f7f389\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/x86/kvm/svm/sev.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.260\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.211\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.38\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.16\",\"versionEndExcluding\":\"5.10.260\",\"matchCriteriaId\":\"C98B7575-9FE9-4CC5-BC50-FA540CAA3E7D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.211\",\"matchCriteriaId\":\"D71C101E-388C-4A46-BD99-49049F7C5CFF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.177\",\"matchCriteriaId\":\"333C9E30-7FD4-46A2-94EF-C1AA1F3EE28B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.144\",\"matchCriteriaId\":\"C8AD3BC8-C843-423C-B9DB-CB52F67F578E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.95\",\"matchCriteriaId\":\"4E206B86-E0E3-4394-A93F-39F2D50A8AA8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.38\",\"matchCriteriaId\":\"FA591B28-5D62-449E-BDBE-3C9391BF070A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.1.3\",\"matchCriteriaId\":\"9526B150-E2B3-4C6F-8AE5-1AF92B75AD9E\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2753a097d1fe24c4351c608048612c74108aa89f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/64f2449841ffc7d203183aa4c748c9c77951ecc5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/720949ed666f34ff28ffdfe1471a5861d1e41fdf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/78ee2d50185a037b3d2452a97f3dad69c3f7f389\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/889c2a9c59897ca912bf39df5bb92555a0a13df4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9349b50f4b11f135fe73b56cb2c2c872d8bc71d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e1a0fe288dee07b7da25a71e007c1ecd1080315b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f701ae476cb92a3a3d8844bb39bb63b4512684c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T17:44:59+00:00",
      "cve": "CVE-2026-63794",
      "id": "CVE-2026-63794",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63794.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-10T16:49:56Z",
      "cve": "CVE-2026-63794",
      "id": "CVE-2026-63794",
      "initial_release_date": "2026-07-19T17:35:12Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "491",
      "product_status:known_not_affected": "48",
      "product_status:recommended": "469",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63794",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63794.json",
      "version": "22"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.