{"id":"CVE-2026-64544","title":"crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents","summary":"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…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 89efd998470a93284b7ad5a20d4e0e3c6858ae8e","Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c","Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < b798ada5a5d1cb4cc4cfa72074b1b463eca6c506","Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 627938383761fb4334b41ebe7ef438d6b8b19d60","Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < e162bc386e71b5412425a38ee048e8d2185491b9","Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 6acd2fbd00f9c72aebefce63fc2e73e8f3d79061","Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 803591785d33cf13b6f73ce2796e8b9e6d5e6526","Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < f7dd32c5179d7755de18e21d5674b08f9e5cb180","Linux 3.17"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:41:15.630067Z"},"published":"2026-07-27","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:44:56.835Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64544","references":[{"url":"https://git.kernel.org/stable/c/89efd998470a93284b7ad5a20d4e0e3c6858ae8e"},{"url":"https://git.kernel.org/stable/c/7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c"},{"url":"https://git.kernel.org/stable/c/b798ada5a5d1cb4cc4cfa72074b1b463eca6c506"},{"url":"https://git.kernel.org/stable/c/627938383761fb4334b41ebe7ef438d6b8b19d60"},{"url":"https://git.kernel.org/stable/c/e162bc386e71b5412425a38ee048e8d2185491b9"},{"url":"https://git.kernel.org/stable/c/6acd2fbd00f9c72aebefce63fc2e73e8f3d79061"},{"url":"https://git.kernel.org/stable/c/803591785d33cf13b6f73ce2796e8b9e6d5e6526"},{"url":"https://git.kernel.org/stable/c/f7dd32c5179d7755de18e21d5674b08f9e5cb180"}],"tags":["cve.org"],"epss":0.00177,"epssPercentile":0.07249,"ingestedAt":"2026-11-06T16:57:43.155Z","slug":"CVE-2026-64544","body":"## Overview\n\nIn 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  <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\nValidate that the addition does not overflow and the result does not\nexceed pelen before the subtraction. Return -ELIBBAD on failure.\n\n## Affected\n\n- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 89efd998470a93284b7ad5a20d4e0e3c6858ae8e`\n- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c`\n- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < b798ada5a5d1cb4cc4cfa72074b1b463eca6c506`\n- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 627938383761fb4334b41ebe7ef438d6b8b19d60`\n- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < e162bc386e71b5412425a38ee048e8d2185491b9`\n- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 6acd2fbd00f9c72aebefce63fc2e73e8f3d79061`\n- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 803591785d33cf13b6f73ce2796e8b9e6d5e6526`\n- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < f7dd32c5179d7755de18e21d5674b08f9e5cb180`\n- `Linux 3.17`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}