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

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-07-19 12:02
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
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
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)
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-rc1 , ≤ * (original_commit_for_fix)
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{
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      "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": "2026-07-19T12:02:03.488Z",
        "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": "2026-07-19T12:02:03.488Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63794",
      "date": "2026-07-21",
      "epss": "0.00177",
      "percentile": "0.07474"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-20T14:44:48.000Z",
      "cve": "CVE-2026-63794",
      "id": "msrc_CVE-2026-63794",
      "initial_release_date": "2026-07-20T01:05:46.000Z",
      "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": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63794\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T12:16:51.757\",\"lastModified\":\"2026-07-19T12:16:51.757\",\"vulnStatus\":\"Received\",\"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-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2753a097d1fe24c4351c608048612c74108aa89f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/64f2449841ffc7d203183aa4c748c9c77951ecc5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/720949ed666f34ff28ffdfe1471a5861d1e41fdf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78ee2d50185a037b3d2452a97f3dad69c3f7f389\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/889c2a9c59897ca912bf39df5bb92555a0a13df4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9349b50f4b11f135fe73b56cb2c2c872d8bc71d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e1a0fe288dee07b7da25a71e007c1ecd1080315b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f701ae476cb92a3a3d8844bb39bb63b4512684c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-20T15:22:14+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"
    }
  }
}



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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.