---
id: CVE-2026-80832
title: 'crypto: qce - fix CCM AAD buffer underallocation'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  crypto: qce - fix CCM AAD buffer underallocation

  The AAD buffer allocated in qce_aead_ccm_prepare_buf_assoclen()
  can be smaller than the length later programmed into t…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 <
    11775b35ce9f27e73d62188d7d38aa0dc0a219aa
  - >-
    Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 <
    c9e0f06a023107694698a7930616aeb460d91816
  - >-
    Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 <
    cc56d2b0d77cfeea061e98114992ee687d5eb4dd
  - >-
    Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 <
    002f1f99aef7ea631cb687fc17bce64e4963f6aa
  - >-
    Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 <
    2f65718b9c1095eef1ae9b374aa0384b1b083f3c
  - >-
    Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 <
    46a84efe2dbaddde89073a3c00c694486937c34b
  - >-
    Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 <
    4839f4c21f9c577eedef2919ced878a3057c7fc3
  - >-
    Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 <
    7f2345f47dd189625f657cd72437179ab4170ee1
  - Linux 5.14
published: '2026-09-04'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:44:24.636Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80832'
references:
  - url: 'https://git.kernel.org/stable/c/11775b35ce9f27e73d62188d7d38aa0dc0a219aa'
  - url: 'https://git.kernel.org/stable/c/c9e0f06a023107694698a7930616aeb460d91816'
  - url: 'https://git.kernel.org/stable/c/cc56d2b0d77cfeea061e98114992ee687d5eb4dd'
  - url: 'https://git.kernel.org/stable/c/002f1f99aef7ea631cb687fc17bce64e4963f6aa'
  - url: 'https://git.kernel.org/stable/c/2f65718b9c1095eef1ae9b374aa0384b1b083f3c'
  - url: 'https://git.kernel.org/stable/c/46a84efe2dbaddde89073a3c00c694486937c34b'
  - url: 'https://git.kernel.org/stable/c/4839f4c21f9c577eedef2919ced878a3057c7fc3'
  - url: 'https://git.kernel.org/stable/c/7f2345f47dd189625f657cd72437179ab4170ee1'
tags:
  - cve.org
epss: 0.00178
epssPercentile: 0.06888
ingestedAt: '2026-10-19T09:16:01.500Z'
---

## Overview

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

crypto: qce - fix CCM AAD buffer underallocation

The AAD buffer allocated in qce_aead_ccm_prepare_buf_assoclen()
can be smaller than the length later programmed into the DMA
scatterlist.

The allocation size is currently calculated as:

  ALIGN(assoclen, 16) + MAX_CCM_ADATA_HEADER_LEN

while the DMA length is set to:

  ALIGN(assoclen + adata_header_len, 16)

Since ALIGN() does not distribute over addition, the allocation
can be smaller than the DMA length. For example, when
assoclen = 32 and adata_header_len = 2:

  allocation = ALIGN(32, 16) + 6 = 38
  DMA length = ALIGN(32 + 2, 16) = 48

As a result, the QCE hardware can read beyond the allocated
buffer while computing the CBC-MAC over the associated data.
The extra bytes are folded into the authentication tag,
resulting in an incorrect tag and causing CCM self-test
failures such as:

  alg: aead: ccm-aes-qce encryption test failed (wrong result)
  on test vector 8

Fix the allocation by adding the maximum possible AAD header
length before alignment:

  ALIGN(assoclen + MAX_CCM_ADATA_HEADER_LEN, 16)

This guarantees that the allocated buffer is large enough
for the fully padded AAD data for all supported header sizes.

## Affected

- `Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 < 11775b35ce9f27e73d62188d7d38aa0dc0a219aa`
- `Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 < c9e0f06a023107694698a7930616aeb460d91816`
- `Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 < cc56d2b0d77cfeea061e98114992ee687d5eb4dd`
- `Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 < 002f1f99aef7ea631cb687fc17bce64e4963f6aa`
- `Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 < 2f65718b9c1095eef1ae9b374aa0384b1b083f3c`
- `Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 < 46a84efe2dbaddde89073a3c00c694486937c34b`
- `Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 < 4839f4c21f9c577eedef2919ced878a3057c7fc3`
- `Linux >= 9363efb4181c5e0fbf86bdfa759262aa29f0eb50 < 7f2345f47dd189625f657cd72437179ab4170ee1`
- `Linux 5.14`

## Remediation

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