Google Android: Out-of-bounds write in NFC stack allows local privilege escalation
Summary
An out-of-bounds write in the stpropnci_process function of the ST NFC hardware abstraction layer is caused by an incorrect bounds check. A local attacker with low privileges and no user interaction can use it to escalate privileges on an affected Android device. Exploitation requires a foothold on the device first, such as a malicious app or a compromised process, so the issue is not directly reachable from the internet.
Affected
- Android 17 (per the Android Security Bulletin, October 2026; the CVE record lists earlier versions as unaffected)
Fixed in
- Devices with security patch level 2026-10-01 or later
- Upstream fix: Google Git commit bbb2d21 in platform/hardware/st/nfc
- Check the update for your device model with the device vendor, as device-specific build numbers are unknown.
Workaround
Unknown.
Exploitation
- Not known to be exploited in the wild.
- Not listed in the CISA KEV catalog.
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
- No public proof of concept found.
Our recommendation
- Use MDM to enforce security patch level 2026-10-01 or later on company phones and tablets.
- Prioritise devices that install apps from outside the managed app store.
- Track the OEM update for each device model and install it promptly.
- Monitor managed devices for unusual privilege changes or suspicious apps.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Android Security Bulletin, October 2026 source.android.com
- Google Git commit bbb2d21 (ST NFC HAL fix) android.googlesource.com
- HOL Guard / CISA ADP Vulnrichment hol.org
- HKCERT Android security bulletin www.hkcert.org
- GrapheneOS PR #3 (same fix) github.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 2 Nov 2026, 06:25.
Original description (NVD)
In stpropnci_process of stpropnci.cc, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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