Snapdragon: Reusing a Nonce, Key Pair in Encryption
CVE-2026-21383 is a high-severity reusing a nonce, key pair in encryption vulnerability in Snapdragon from Qualcomm, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. Affected Snapdragon versions: FastConnect 6900; FastConnect 7800; LeMans_AU_LGIT, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.1% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Snapdragon you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on docs.qualcomm.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Qualcomm | Snapdragon | FastConnect 6900; FastConnect 7800; LeMans_AU_LGIT; LeMansAU; Pandeiro; QAM8255P; QAM8397P; QAM8797P; and 32 more ranges | Not stated |
| Qualcomm | Fastconnect 6900 Firmware | Not specified in the record | Not stated |
| Qualcomm | Fastconnect 7800 Firmware | Not specified in the record | Not stated |
| Qualcomm | Lemans Au Lgit Firmware | Not specified in the record | Not stated |
| Qualcomm | Lemansau Firmware | Not specified in the record | Not stated |
| Qualcomm | Pandeiro Firmware | Not specified in the record | Not stated |
| Qualcomm | Qam8255p Firmware | Not specified in the record | Not stated |
| Qualcomm | Qam8397p Firmware | Not specified in the record | Not stated |
| Qualcomm | Qam8797p Firmware | Not specified in the record | Not stated |
| Qualcomm | Qamsrv1h Firmware | Not specified in the record | Not stated |
| Qualcomm | Qamsrv1m Firmware | Not specified in the record | Not stated |
| Qualcomm | Qca6595au Firmware | Not specified in the record | Not stated |
| Qualcomm | Qca6696 Firmware | Not specified in the record | Not stated |
| Qualcomm | Qca6698aq Firmware | Not specified in the record | Not stated |
| Qualcomm | Qca6797aq Firmware | Not specified in the record | Not stated |
| Qualcomm | Qca8695au Firmware | Not specified in the record | Not stated |
| Qualcomm | Qdu1000 Firmware | Not specified in the record | Not stated |
| Qualcomm | Qdu1110 Firmware | Not specified in the record | Not stated |
| Qualcomm | Qdu1210 Firmware | Not specified in the record | Not stated |
| Qualcomm | Qdx1010 Firmware | Not specified in the record | Not stated |
| Qualcomm | Qdx1011 Firmware | Not specified in the record | Not stated |
| Qualcomm | Qln1083bd Firmware | Not specified in the record | Not stated |
| Qualcomm | Qln1086bd Firmware | Not specified in the record | Not stated |
| Qualcomm | Qpa1083bd Firmware | Not specified in the record | Not stated |
| Qualcomm | Qpa1086bd Firmware | Not specified in the record | Not stated |
Version data comes from the organisation that assigned the CVE; 28 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. Scored by CNA (qualcomm.com).
Official description
Cryptographic Issue when using a static initialization vector for AES-GCM key wrapping, which requires a unique value for each call to ensure security.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Reusing a Nonce, Key Pair in Encryption
Nonces should be used for the present occasion and only once.
How developers prevent this class of flaw
- Use techniques such as requiring incrementing, time based and/or challenge response to assure uniqueness of nonces.
More Reusing a Nonce, Key Pair in Encryption vulnerabilities (CWE-323)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in Snapdragon
- 7.1 High severity
- 7.0 High severity
Recent Reusing a Nonce, Key Pair in Encryption vulnerabilities
- 9.1 Critical severity
- 7.5 High severity
- 9.1 Critical severity
- 9.1 Critical severity
- 7.1 High severity
- 8.1 High severity
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