CVE-2026-21068
HIGH 8.4Stack-based buffer overflow in libril_sem.so prior to SMR Aug-2026 Release 1 allows privileged local attackers to execute arbitrary code.
ELEVATED IMPACT
Severe if exploited (CVSS 8.4), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.1%chance of exploitation in 30 days · 3rd percentile
○ In CISA KEV
○ Public exploit / PoC
Impact if exploited
8.4CVSS 4.0 · HIGH
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ⚠Access: Requires local access to the host
- ⚠Privileges: Requires an admin / high-privilege account
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
- ✓Requirements: No special attack requirements
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept & exploit code
- github-search Search GitHub for public PoC repos
Test against your own equipment
curl -s https://vulnpedia.com/cve/CVE-2026-21068/poc.jsonMachine-readable PoC index for this CVE (for automation).Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-21068/poc.json
Weakness (CWE)
- CWE-121: Stack-based Buffer Overflow
CVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 14.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 15.0 |
| Samsung | Android | 16.0 |
| Samsung | Android | 16.0 |
| Samsung | Android | 16.0 |
| Samsung | Android | 16.0 |
| Samsung | Android | 16.0 |
| Samsung | Android | 16.0 |
| Samsung | Android | 16.0 |
| Samsung | Android | 16.0 |
| Samsung | Android | 16.0 |
| Samsung | Android | 16.0 |
| Samsung | Android | 16.0 |
| Samsung | Android | 16.0 |
| Samsung | Android | 16.0 |
All CVSS metrics
- HIGH 8.4 v4.0 · CNA Primary
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - HIGH 8.4 v4.0 · NVD Secondary
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - HIGH 7.8 v3.1 · NVD Primary
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H