{"cve":"CVE-2026-64544","nvd":{"published":"2026-07-27T21:17:06.980","modified":"2026-10-24T13:10:00.147","status":"Received","description":"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  <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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/627938383761fb4334b41ebe7ef438d6b8b19d60","https://git.kernel.org/stable/c/6acd2fbd00f9c72aebefce63fc2e73e8f3d79061","https://git.kernel.org/stable/c/7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c","https://git.kernel.org/stable/c/803591785d33cf13b6f73ce2796e8b9e6d5e6526","https://git.kernel.org/stable/c/89efd998470a93284b7ad5a20d4e0e3c6858ae8e"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:27.712498749+00:00"},"epss":{"cve":"CVE-2026-64544","score":0.00177,"percentile":0.07168,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}