{"id":"CVE-2026-64544","summary":"crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents","details":"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.","modified":"2026-08-18T03:30:57.849090027Z","published":"2026-07-27T20:10:36.101Z","related":["openSUSE-SU-2026:11476-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64544.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/627938383761fb4334b41ebe7ef438d6b8b19d60"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6acd2fbd00f9c72aebefce63fc2e73e8f3d79061"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/803591785d33cf13b6f73ce2796e8b9e6d5e6526"},{"type":"WEB","url":"https://git.kernel.org/stable/c/89efd998470a93284b7ad5a20d4e0e3c6858ae8e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b798ada5a5d1cb4cc4cfa72074b1b463eca6c506"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e162bc386e71b5412425a38ee048e8d2185491b9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f7dd32c5179d7755de18e21d5674b08f9e5cb180"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64544.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64544"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"af316fc442ef23901bbfcec5af55e69ca6ce9563"},{"fixed":"89efd998470a93284b7ad5a20d4e0e3c6858ae8e"},{"fixed":"7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c"},{"fixed":"b798ada5a5d1cb4cc4cfa72074b1b463eca6c506"},{"fixed":"627938383761fb4334b41ebe7ef438d6b8b19d60"},{"fixed":"e162bc386e71b5412425a38ee048e8d2185491b9"},{"fixed":"6acd2fbd00f9c72aebefce63fc2e73e8f3d79061"},{"fixed":"803591785d33cf13b6f73ce2796e8b9e6d5e6526"},{"fixed":"f7dd32c5179d7755de18e21d5674b08f9e5cb180"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64544.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.17.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64544.json"}}],"schema_version":"1.9.0"}