CVE-2026-80832: Linux kernel · crypto: qce – fix CCM AAD buffer underallocation
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 4 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix has been implemented to correct the buffer allocation calculation in the Linux kernel crypto qce driver. Users should apply the official kernel updates that include this fix. Since this is a kernel-level vulnerability, updating to a patched kernel version is the recommended remediation. Patch status is not explicitly stated in the provided data; therefore, check the vendor or Linux kernel advisory for the exact patched versions and update accordingly.
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.
References
- nvd.nist.gov/vuln/detail/CVE-2026-80832 (opens in a new tab)
- git.kernel.org/stable/c/002f1f99aef7ea631cb687fc17bce64e4963f6aa (opens in a new tab)
- git.kernel.org/stable/c/11775b35ce9f27e73d62188d7d38aa0dc0a219aa (opens in a new tab)
- git.kernel.org/stable/c/2f65718b9c1095eef1ae9b374aa0384b1b083f3c (opens in a new tab)
- git.kernel.org/stable/c/46a84efe2dbaddde89073a3c00c694486937c34b (opens in a new tab)
- git.kernel.org/stable/c/4839f4c21f9c577eedef2919ced878a3057c7fc3 (opens in a new tab)
- git.kernel.org/stable/c/7f2345f47dd189625f657cd72437179ab4170ee1 (opens in a new tab)
- git.kernel.org/stable/c/c9e0f06a023107694698a7930616aeb460d91816 (opens in a new tab)
- git.kernel.org/stable/c/cc56d2b0d77cfeea061e98114992ee687d5eb4dd (opens in a new tab)
- ubuntu.com/security/CVE-2026-80832 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-80832 (opens in a new tab)
- git.kernel.org/linus/7f2345f47dd189625f657cd72437179ab4170ee1 (opens in a new tab)