CVE-2026-64544 is a vulnerability in Linux Kernel
Published on July 27, 2026
crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents
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.
Products Associated with CVE-2026-64544
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Affected Versions
Linux:- Version af316fc442ef23901bbfcec5af55e69ca6ce9563 and below 89efd998470a93284b7ad5a20d4e0e3c6858ae8e is affected.
- Version af316fc442ef23901bbfcec5af55e69ca6ce9563 and below 7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c is affected.
- Version af316fc442ef23901bbfcec5af55e69ca6ce9563 and below b798ada5a5d1cb4cc4cfa72074b1b463eca6c506 is affected.
- Version af316fc442ef23901bbfcec5af55e69ca6ce9563 and below 627938383761fb4334b41ebe7ef438d6b8b19d60 is affected.
- Version af316fc442ef23901bbfcec5af55e69ca6ce9563 and below e162bc386e71b5412425a38ee048e8d2185491b9 is affected.
- Version af316fc442ef23901bbfcec5af55e69ca6ce9563 and below 6acd2fbd00f9c72aebefce63fc2e73e8f3d79061 is affected.
- Version af316fc442ef23901bbfcec5af55e69ca6ce9563 and below 803591785d33cf13b6f73ce2796e8b9e6d5e6526 is affected.
- Version af316fc442ef23901bbfcec5af55e69ca6ce9563 and below f7dd32c5179d7755de18e21d5674b08f9e5cb180 is affected.
- Version 3.17 is affected.
- Before 3.17 is unaffected.
- Version 5.10.261, <= 5.10.* is unaffected.
- Version 5.15.212, <= 5.15.* is unaffected.
- Version 6.1.178, <= 6.1.* is unaffected.
- Version 6.6.145, <= 6.6.* is unaffected.
- Version 6.12.97, <= 6.12.* is unaffected.
- Version 6.18.40, <= 6.18.* is unaffected.
- Version 7.1.5, <= 7.1.* is unaffected.
- Version 7.2-rc1, <= * is unaffected.