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

Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-08-17 04:57
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.
Assigner
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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          "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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    "cveId": "CVE-2026-64544",
    "datePublished": "2026-07-27T20:10:36.101Z",
    "dateReserved": "2026-07-19T15:36:31.795Z",
    "dateUpdated": "2026-08-17T04:57:21.054Z",
    "state": "PUBLISHED"
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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. 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-05T12:42:12+00:00",
      "cve": "CVE-2026-64544",
      "id": "CVE-2026-64544",
      "initial_release_date": "2026-07-27T00:00:00+00:00",
      "product_status:known_affected": "260",
      "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:46:16Z",
      "cve": "CVE-2026-64544",
      "id": "CVE-2026-64544",
      "initial_release_date": "2026-07-28T17:08:02Z",
      "product_status:first_fixed": "88",
      "product_status:known_affected": "671",
      "product_status:known_not_affected": "78",
      "product_status:recommended": "46",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64544",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64544.json",
      "version": "9"
    }
  }
}



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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

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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.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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Detection rules are retrieved from Rulezet.