FKIE_CVE-2026-64544

Vulnerability from fkie_nvd - Published: 2026-07-27 21:17 - Updated: 2026-07-27 21:17
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/627938383761fb4334b41ebe7ef438d6b8b19d60
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6acd2fbd00f9c72aebefce63fc2e73e8f3d79061
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/803591785d33cf13b6f73ce2796e8b9e6d5e6526
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/89efd998470a93284b7ad5a20d4e0e3c6858ae8e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b798ada5a5d1cb4cc4cfa72074b1b463eca6c506
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e162bc386e71b5412425a38ee048e8d2185491b9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7dd32c5179d7755de18e21d5674b08f9e5cb180
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "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": [
            {
              "lessThan": "89efd998470a93284b7ad5a20d4e0e3c6858ae8e",
              "status": "affected",
              "version": "af316fc442ef23901bbfcec5af55e69ca6ce9563",
              "versionType": "git"
            },
            {
              "lessThan": "7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c",
              "status": "affected",
              "version": "af316fc442ef23901bbfcec5af55e69ca6ce9563",
              "versionType": "git"
            },
            {
              "lessThan": "b798ada5a5d1cb4cc4cfa72074b1b463eca6c506",
              "status": "affected",
              "version": "af316fc442ef23901bbfcec5af55e69ca6ce9563",
              "versionType": "git"
            },
            {
              "lessThan": "627938383761fb4334b41ebe7ef438d6b8b19d60",
              "status": "affected",
              "version": "af316fc442ef23901bbfcec5af55e69ca6ce9563",
              "versionType": "git"
            },
            {
              "lessThan": "e162bc386e71b5412425a38ee048e8d2185491b9",
              "status": "affected",
              "version": "af316fc442ef23901bbfcec5af55e69ca6ce9563",
              "versionType": "git"
            },
            {
              "lessThan": "6acd2fbd00f9c72aebefce63fc2e73e8f3d79061",
              "status": "affected",
              "version": "af316fc442ef23901bbfcec5af55e69ca6ce9563",
              "versionType": "git"
            },
            {
              "lessThan": "803591785d33cf13b6f73ce2796e8b9e6d5e6526",
              "status": "affected",
              "version": "af316fc442ef23901bbfcec5af55e69ca6ce9563",
              "versionType": "git"
            },
            {
              "lessThan": "f7dd32c5179d7755de18e21d5674b08f9e5cb180",
              "status": "affected",
              "version": "af316fc442ef23901bbfcec5af55e69ca6ce9563",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "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": [
            {
              "status": "affected",
              "version": "3.17"
            },
            {
              "lessThan": "3.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-64544",
  "lastModified": "2026-07-27T21:17:06.980",
  "metrics": {},
  "published": "2026-07-27T21:17:06.980",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/627938383761fb4334b41ebe7ef438d6b8b19d60"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6acd2fbd00f9c72aebefce63fc2e73e8f3d79061"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/803591785d33cf13b6f73ce2796e8b9e6d5e6526"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/89efd998470a93284b7ad5a20d4e0e3c6858ae8e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b798ada5a5d1cb4cc4cfa72074b1b463eca6c506"
    },
    {
      "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": "Received"
}



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