CVE-2026-64544
crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents
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.
INFO
Published Date :
July 27, 2026, 9:17 p.m.
Last Modified :
July 27, 2026, 9:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64544
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Validate addition does not overflow before subtraction.
- Ensure result does not exceed pelen before subtraction.
- Return -ELIBBAD on calculation failure.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64544.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64544 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64544
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64544 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64544 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 27, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'af316fc442ef23901bbfcec5af55e69ca6ce9563', 'lessThan': '89efd998470a93284b7ad5a20d4e0e3c6858ae8e', 'versionType': 'git'}, {'status': 'affected', 'version': 'af316fc442ef23901bbfcec5af55e69ca6ce9563', 'lessThan': '7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c', 'versionType': 'git'}, {'status': 'affected', 'version': 'af316fc442ef23901bbfcec5af55e69ca6ce9563', 'lessThan': 'b798ada5a5d1cb4cc4cfa72074b1b463eca6c506', 'versionType': 'git'}, {'status': 'affected', 'version': 'af316fc442ef23901bbfcec5af55e69ca6ce9563', 'lessThan': '627938383761fb4334b41ebe7ef438d6b8b19d60', 'versionType': 'git'}, {'status': 'affected', 'version': 'af316fc442ef23901bbfcec5af55e69ca6ce9563', 'lessThan': 'e162bc386e71b5412425a38ee048e8d2185491b9', 'versionType': 'git'}, {'status': 'affected', 'version': 'af316fc442ef23901bbfcec5af55e69ca6ce9563', 'lessThan': '6acd2fbd00f9c72aebefce63fc2e73e8f3d79061', 'versionType': 'git'}, {'status': 'affected', 'version': 'af316fc442ef23901bbfcec5af55e69ca6ce9563', 'lessThan': '803591785d33cf13b6f73ce2796e8b9e6d5e6526', 'versionType': 'git'}, {'status': 'affected', 'version': 'af316fc442ef23901bbfcec5af55e69ca6ce9563', 'lessThan': 'f7dd32c5179d7755de18e21d5674b08f9e5cb180', 'versionType': 'git'}], 'programFiles': ['crypto/asymmetric_keys/verify_pefile.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.17'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.17', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['crypto/asymmetric_keys/verify_pefile.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/627938383761fb4334b41ebe7ef438d6b8b19d60 Added Reference https://git.kernel.org/stable/c/6acd2fbd00f9c72aebefce63fc2e73e8f3d79061 Added Reference https://git.kernel.org/stable/c/7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c Added Reference https://git.kernel.org/stable/c/803591785d33cf13b6f73ce2796e8b9e6d5e6526 Added Reference https://git.kernel.org/stable/c/89efd998470a93284b7ad5a20d4e0e3c6858ae8e Added Reference https://git.kernel.org/stable/c/b798ada5a5d1cb4cc4cfa72074b1b463eca6c506 Added Reference https://git.kernel.org/stable/c/e162bc386e71b5412425a38ee048e8d2185491b9 Added Reference https://git.kernel.org/stable/c/f7dd32c5179d7755de18e21d5674b08f9e5cb180