CVE-2026-64544
Full vulnerability record from the local CVENow database.
Description
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
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-07-27 21:17:06.980000
Last modified
2026-10-24 13:10:00.147000
View original CVE JSON
{
"id": "CVE-2026-64544",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-07-27T21:17:06.980",
"lastModified": "2026-10-24T13:10:00.147",
"vulnStatus": "Received",
"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 <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."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: asymmetric_keys - corrige lectura fuera de límites en pefile_digest_pe_contents\n\npefile_digest_pe_contents() calcula la longitud del hash de los datos finales como pelen - (hashed_bytes + certs_size). Un PE manipulado puede hacer que la suma exceda pelen, causando que la resta sin signo desborde negativamente a ~4 GiB. Esto se pasa a crypto_shash_update() que lee fuera de límites y entra en pánico en páginas de guardia vmalloc no mapeadas.\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\nValidar que la suma no desborde y el resultado no exceda pelen antes de la resta. Devolver -ELIBBAD en caso de fallo."
}
],
"affected": [
{
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"affectedData": [
{
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"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
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{
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{
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},
{
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},
{
"version": "6.12.97",
"lessThanOrEqual": "6.12.*",
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},
{
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},
{
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},
{
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}
]
}
]
}
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"metrics": {},
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