---
id: CVE-2026-64312
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  crypto: pcrypt - restore callback for non-parallel fallback

  pcrypt installs pcrypt_aead_done() on the child AEAD request before
  trying to submit it through padata
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  crypto: pcrypt - restore callback for non-parallel fallback

  pcrypt installs pcrypt_aead_done() on the child AEAD request before
  trying to submit it through padata.  If…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
published: '2026-07-25'
updated: '2026-07-27'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64312'
references:
  - url: 'https://git.kernel.org/stable/c/3920c5f6edc341729d20d0507e466c6d3b11f372'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4711ca06bd169a2cbc9cc59a6de2ed512c41a880'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/81ce16d938db9b88cdc231522c0358395ae8c6b5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/82789a44415e3e31168229421b138278dfb16412'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/83fa1397d5853de1e27dd52ec44b068ff358ca18'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ae93c5b3e2a2968b56d772ca1d06615927b7cc36'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c4bd2f4c35b0e15b6040c2f7e7e7986780c066cf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ed459fe319376e876de433d12b6c6772e612ca36'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64312.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-64312'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2507144'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-64312'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64312'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026072509-CVE-2026-64312-2566@gregkh/T
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00501
epssPercentile: 0.42711
ingestedAt: '2026-07-27T06:16:50.347Z'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a92ccd3618e42333ac6f150ecdac14dca298bc7a <
    81ce16d938db9b88cdc231522c0358395ae8c6b5
  - >-
    Linux >= 96001f52ae8c70e2c736d3e1e5dc53d5b521e5ca <
    3920c5f6edc341729d20d0507e466c6d3b11f372
  - >-
    Linux >= 92834692a539b5b7f409e467a14667d64713b732 <
    ae93c5b3e2a2968b56d772ca1d06615927b7cc36
  - >-
    Linux >= 5edae7a9a35606017ee6e05911c290acee9fee5a <
    82789a44415e3e31168229421b138278dfb16412
  - >-
    Linux >= 7ddab756f2de5b7b43c122ebebdf37f400fb2b6f <
    4711ca06bd169a2cbc9cc59a6de2ed512c41a880
  - >-
    Linux >= 662f2f13e66d3883b9238b0b96b17886179e60e2 <
    c4bd2f4c35b0e15b6040c2f7e7e7986780c066cf
  - >-
    Linux >= 662f2f13e66d3883b9238b0b96b17886179e60e2 <
    83fa1397d5853de1e27dd52ec44b068ff358ca18
  - >-
    Linux >= 662f2f13e66d3883b9238b0b96b17886179e60e2 <
    ed459fe319376e876de433d12b6c6772e612ca36
  - Linux dd8bf8eb5beba1e7c3b11a9a5a58ccbf345a69e6
  - Linux fca8aed12218f96b38e374ff264d78ea1fbd23cc
  - Linux a8e0074ffb38c9a5964a221bb998034d016c93a2
  - Linux >= 5.10.231 < 5.10.261
  - Linux >= 5.15.174 < 5.15.212
  - Linux >= 6.1.120 < 6.1.178
  - Linux >= 6.6.64 < 6.6.145
  - Linux >= 6.12.2 < 6.12.96
  - Linux >= 4.19.325 < 4.20
  - Linux >= 5.4.287 < 5.5
  - Linux >= 6.11.11 < 6.12
  - Linux 6.13
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T15:38:50.962318Z'
cwe:
  - CWE-430
scores:
  nvd: 7.5
  vendor: 7
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

crypto: pcrypt - restore callback for non-parallel fallback

pcrypt installs pcrypt_aead_done() on the child AEAD request before
trying to submit it through padata.  If padata_do_parallel() returns
-EBUSY, pcrypt falls back to calling the child AEAD directly.

That fallback must not keep the padata completion callback.  Otherwise
an asynchronous completion runs pcrypt_aead_done() even though the
request was never enrolled in padata.

Restore the original request callback and callback data before calling
the child AEAD directly.  This keeps the fallback path aligned with a
direct AEAD request while leaving the parallel path unchanged.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64312.json)