CVE-2026-64544

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/89efd998470a93284b7ad5a20d4e0e3c6858ae8e
• https://git.kernel.org/stable/c/7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c
• https://git.kernel.org/stable/c/b798ada5a5d1cb4cc4cfa72074b1b463eca6c506
• https://git.kernel.org/stable/c/627938383761fb4334b41ebe7ef438d6b8b19d60
• https://git.kernel.org/stable/c/e162bc386e71b5412425a38ee048e8d2185491b9
• https://git.kernel.org/stable/c/6acd2fbd00f9c72aebefce63fc2e73e8f3d79061
• https://git.kernel.org/stable/c/803591785d33cf13b6f73ce2796e8b9e6d5e6526
• https://git.kernel.org/stable/c/f7dd32c5179d7755de18e21d5674b08f9e5cb180

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