CVE-2026-64544 (GCVE-0-2026-64544)

Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-11-06 16:44
VLAI
Title
crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents pefile_digest_pe_contents() computes the trailing-data hash length as pelen - (hashed_bytes + certs_size). A crafted PE can make the addition exceed pelen, causing the unsigned subtraction to underflow to ~4 GiB. This is passed to crypto_shash_update() which reads out of bounds and panics on unmapped vmalloc guard pages. BUG: unable to handle page fault for address: ffffc900038d8000 Oops: Oops: 0000 [#1] SMP KASAN NOPTI RIP: 0010:sha256_blocks_generic (lib/crypto/sha256.c:152) Call Trace: <TASK> __sha256_update (lib/crypto/sha256.c:208) crypto_sha256_update (crypto/sha256.c:142) verify_pefile_signature (crypto/asymmetric_keys/verify_pefile.c:436) kexec_kernel_verify_pe_sig (kernel/kexec_file.c:151) __do_sys_kexec_file_load (kernel/kexec_file.c:406) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) </TASK> Kernel panic - not syncing: Fatal exception Validate that the addition does not overflow and the result does not exceed pelen before the subtraction. Return -ELIBBAD on failure.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 16:41 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: af316fc442ef23901bbfcec5af55e69ca6ce9563 , < 89efd998470a93284b7ad5a20d4e0e3c6858ae8e (git)
Affected: af316fc442ef23901bbfcec5af55e69ca6ce9563 , < 7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c (git)
Affected: af316fc442ef23901bbfcec5af55e69ca6ce9563 , < b798ada5a5d1cb4cc4cfa72074b1b463eca6c506 (git)
Affected: af316fc442ef23901bbfcec5af55e69ca6ce9563 , < 627938383761fb4334b41ebe7ef438d6b8b19d60 (git)
Affected: af316fc442ef23901bbfcec5af55e69ca6ce9563 , < e162bc386e71b5412425a38ee048e8d2185491b9 (git)
Affected: af316fc442ef23901bbfcec5af55e69ca6ce9563 , < 6acd2fbd00f9c72aebefce63fc2e73e8f3d79061 (git)
Affected: af316fc442ef23901bbfcec5af55e69ca6ce9563 , < 803591785d33cf13b6f73ce2796e8b9e6d5e6526 (git)
Affected: af316fc442ef23901bbfcec5af55e69ca6ce9563 , < f7dd32c5179d7755de18e21d5674b08f9e5cb180 (git)
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Linux Linux Affected: 3.17
Unaffected: 0 , < 3.17 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents\n\npefile_digest_pe_contents() computes the trailing-data hash length as\npelen - (hashed_bytes + certs_size). A crafted PE can make the addition\nexceed pelen, causing the unsigned subtraction to underflow to ~4 GiB.\nThis is passed to crypto_shash_update() which reads out of bounds and\npanics on unmapped vmalloc guard pages.\n\n BUG: unable to handle page fault for address: ffffc900038d8000\n Oops: Oops: 0000 [#1] SMP KASAN NOPTI\n RIP: 0010:sha256_blocks_generic (lib/crypto/sha256.c:152)\n Call Trace:\n  \u003cTASK\u003e\n  __sha256_update (lib/crypto/sha256.c:208)\n  crypto_sha256_update (crypto/sha256.c:142)\n  verify_pefile_signature (crypto/asymmetric_keys/verify_pefile.c:436)\n  kexec_kernel_verify_pe_sig (kernel/kexec_file.c:151)\n  __do_sys_kexec_file_load (kernel/kexec_file.c:406)\n  do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n  \u003c/TASK\u003e\n Kernel panic - not syncing: Fatal exception\n\nValidate that the addition does not overflow and the result does not\nexceed pelen before the subtraction. Return -ELIBBAD on failure."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: asymmetric_keys - corrige lectura fuera de l\u00edmites en pefile_digest_pe_contents\n\npefile_digest_pe_contents() calcula la longitud del hash de los datos finales como pelen - (hashed_bytes + certs_size). Un PE manipulado puede hacer que la suma exceda pelen, causando que la resta sin signo desborde negativamente a ~4 GiB. Esto se pasa a crypto_shash_update() que lee fuera de l\u00edmites y entra en p\u00e1nico en p\u00e1ginas de guardia vmalloc no mapeadas.\n\n BUG: unable to handle page fault for address: ffffc900038d8000\n Oops: Oops: 0000 [#1] SMP KASAN NOPTI\n RIP: 0010:sha256_blocks_generic (lib/crypto/sha256.c:152)\n Call Trace:\n  [TASK]\n  __sha256_update (lib/crypto/sha256.c:208)\n  crypto_sha256_update (crypto/sha256.c:142)\n  verify_pefile_signature (crypto/asymmetric_keys/verify_pefile.c:436)\n  kexec_kernel_verify_pe_sig (kernel/kexec_file.c:151)\n  __do_sys_kexec_file_load (kernel/kexec_file.c:406)\n  do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n  [/TASK]\n Kernel panic - not syncing: Fatal exception\n\nValidar que la suma no desborde y el resultado no exceda pelen antes de la resta. Devolver -ELIBBAD en caso de fallo."
          }
        ],
        "id": "CVE-2026-64544",
        "lastModified": "2026-11-06T17:19:01.240",
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            "url": "https://git.kernel.org/stable/c/7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c"
          },
          {
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            "url": "https://git.kernel.org/stable/c/803591785d33cf13b6f73ce2796e8b9e6d5e6526"
          },
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e162bc386e71b5412425a38ee048e8d2185491b9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f7dd32c5179d7755de18e21d5674b08f9e5cb180"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-11-07T04:43:53+00:00",
      "cve": "CVE-2026-64544",
      "id": "CVE-2026-64544",
      "initial_release_date": "2026-07-27T00:00:00+00:00",
      "product_status:known_affected": "186",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64544.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-64544",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-11-06T16:41:15.630067Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-11-06T16:41:16.927Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "crypto/asymmetric_keys/verify_pefile.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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              "vendor": "Linux",
              "versions": [
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                },
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                  "version": "0",
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                },
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                  "status": "unaffected",
                  "version": "5.15.212",
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                  "status": "unaffected",
                  "version": "6.1.178",
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                {
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                  "status": "unaffected",
                  "version": "6.6.145",
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                  "version": "7.1.5",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.2",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
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                      "versionStartIncluding": "3.17",
                      "vulnerable": true
                    },
                    {
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                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents\n\npefile_digest_pe_contents() computes the trailing-data hash length as\npelen - (hashed_bytes + certs_size). A crafted PE can make the addition\nexceed pelen, causing the unsigned subtraction to underflow to ~4 GiB.\nThis is passed to crypto_shash_update() which reads out of bounds and\npanics on unmapped vmalloc guard pages.\n\n BUG: unable to handle page fault for address: ffffc900038d8000\n Oops: Oops: 0000 [#1] SMP KASAN NOPTI\n RIP: 0010:sha256_blocks_generic (lib/crypto/sha256.c:152)\n Call Trace:\n  \u003cTASK\u003e\n  __sha256_update (lib/crypto/sha256.c:208)\n  crypto_sha256_update (crypto/sha256.c:142)\n  verify_pefile_signature (crypto/asymmetric_keys/verify_pefile.c:436)\n  kexec_kernel_verify_pe_sig (kernel/kexec_file.c:151)\n  __do_sys_kexec_file_load (kernel/kexec_file.c:406)\n  do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n  \u003c/TASK\u003e\n Kernel panic - not syncing: Fatal exception\n\nValidate that the addition does not overflow and the result does not\nexceed pelen before the subtraction. Return -ELIBBAD on failure."
            }
          ],
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            "dateUpdated": "2026-08-17T04:57:21.054Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            },
            {
              "url": "https://git.kernel.org/stable/c/f7dd32c5179d7755de18e21d5674b08f9e5cb180"
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          ],
          "title": "crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
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      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-64544",
        "datePublished": "2026-07-27T20:10:36.101Z",
        "dateReserved": "2026-07-19T15:36:31.795Z",
        "dateUpdated": "2026-11-06T16:44:56.835Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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