CVE-2026-64544 (GCVE-0-2026-64544)
Vulnerability from cvelistv5
Published
2026-07-27 20:10
Modified
2026-08-17 04:57
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: af316fc442ef23901bbfcec5af55e69ca6ce9563 Version: af316fc442ef23901bbfcec5af55e69ca6ce9563 Version: af316fc442ef23901bbfcec5af55e69ca6ce9563 Version: af316fc442ef23901bbfcec5af55e69ca6ce9563 Version: af316fc442ef23901bbfcec5af55e69ca6ce9563 Version: af316fc442ef23901bbfcec5af55e69ca6ce9563 Version: af316fc442ef23901bbfcec5af55e69ca6ce9563 Version: af316fc442ef23901bbfcec5af55e69ca6ce9563 |
||
{
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"negate": false,
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"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 \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."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:57:21.054Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
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},
{
"url": "https://git.kernel.org/stable/c/7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c"
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{
"url": "https://git.kernel.org/stable/c/b798ada5a5d1cb4cc4cfa72074b1b463eca6c506"
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{
"url": "https://git.kernel.org/stable/c/627938383761fb4334b41ebe7ef438d6b8b19d60"
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{
"url": "https://git.kernel.org/stable/c/e162bc386e71b5412425a38ee048e8d2185491b9"
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"url": "https://git.kernel.org/stable/c/6acd2fbd00f9c72aebefce63fc2e73e8f3d79061"
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{
"url": "https://git.kernel.org/stable/c/803591785d33cf13b6f73ce2796e8b9e6d5e6526"
},
{
"url": "https://git.kernel.org/stable/c/f7dd32c5179d7755de18e21d5674b08f9e5cb180"
}
],
"title": "crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents",
"x_generator": {
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}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"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"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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