CVE-2026-80832

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 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 Software

Weaknesses

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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