---
id: CVE-2026-64544
title: 'crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents'
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…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 <
    89efd998470a93284b7ad5a20d4e0e3c6858ae8e
  - >-
    Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 <
    7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c
  - >-
    Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 <
    b798ada5a5d1cb4cc4cfa72074b1b463eca6c506
  - >-
    Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 <
    627938383761fb4334b41ebe7ef438d6b8b19d60
  - >-
    Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 <
    e162bc386e71b5412425a38ee048e8d2185491b9
  - >-
    Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 <
    6acd2fbd00f9c72aebefce63fc2e73e8f3d79061
  - >-
    Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 <
    803591785d33cf13b6f73ce2796e8b9e6d5e6526
  - >-
    Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 <
    f7dd32c5179d7755de18e21d5674b08f9e5cb180
  - Linux 3.17
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:41:15.630067Z'
published: '2026-07-27'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:44:56.835Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-64544'
references:
  - url: 'https://git.kernel.org/stable/c/89efd998470a93284b7ad5a20d4e0e3c6858ae8e'
  - url: 'https://git.kernel.org/stable/c/7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c'
  - url: 'https://git.kernel.org/stable/c/b798ada5a5d1cb4cc4cfa72074b1b463eca6c506'
  - url: 'https://git.kernel.org/stable/c/627938383761fb4334b41ebe7ef438d6b8b19d60'
  - url: 'https://git.kernel.org/stable/c/e162bc386e71b5412425a38ee048e8d2185491b9'
  - url: 'https://git.kernel.org/stable/c/6acd2fbd00f9c72aebefce63fc2e73e8f3d79061'
  - url: 'https://git.kernel.org/stable/c/803591785d33cf13b6f73ce2796e8b9e6d5e6526'
  - url: 'https://git.kernel.org/stable/c/f7dd32c5179d7755de18e21d5674b08f9e5cb180'
tags:
  - cve.org
epss: 0.00177
epssPercentile: 0.07249
ingestedAt: '2026-11-06T16:57:43.155Z'
---

## Overview

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

- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 89efd998470a93284b7ad5a20d4e0e3c6858ae8e`
- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c`
- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < b798ada5a5d1cb4cc4cfa72074b1b463eca6c506`
- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 627938383761fb4334b41ebe7ef438d6b8b19d60`
- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < e162bc386e71b5412425a38ee048e8d2185491b9`
- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 6acd2fbd00f9c72aebefce63fc2e73e8f3d79061`
- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < 803591785d33cf13b6f73ce2796e8b9e6d5e6526`
- `Linux >= af316fc442ef23901bbfcec5af55e69ca6ce9563 < f7dd32c5179d7755de18e21d5674b08f9e5cb180`
- `Linux 3.17`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.