In FreeBSD 12.1-STABLE before r364644, 11.4-STABLE before r364651, 12.1-RELEASE before p9, 11.4-RELEASE before p3, and 11.3-RELEASE before p13, improper handling in the kernel causes a use-after-free bug by sending large user messages from multiple threads on the same SCTP socket. The use-after-free situation may result in unintended kernel behaviour including a kernel panic.
CVSS v4.0 Metrics
Exploitability
Attack VectorLocal
ComplexityLow
RequirementsPresent
PrivilegesLow
User InteractionNone
Threat
Exploit MaturityPoC
Vulnerable System
ConfidentialityNone
IntegrityNone
AvailabilityHigh
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Change Log
| Date | Source | Changes | Score |
|---|
| 2026-07-21 | PoC | E: U→P | 1.9 → 4.7 |
| 2026-07-21 | nvd | AV: P→L, AC: H→L, PR: H→L, UI: A→N, VA: N→H | 0.0 → 1.9 |
| 2026-07-21 | cve.org | initial, patch: Unavailable | 0.0 |
Affected Software
| Vendor | Product | Version |
|---|
| apple | icloud | < 12.3 |
| apple | ipados | < 14.5 |
| apple | iphone_os | < 14.5 |
| apple | itunes | < 12.11.3 |
| apple | macos | ≥ 11.0, < 11.3 |
| apple | safari | < 14.1 |
| apple | tvos | < 14.5 |
| apple | watchos | < 7.4 |
| freebsd | freebsd | 11.3 |
| freebsd | freebsd | 11.4 |
| freebsd | freebsd | 12.1 |
| freebsd | freebsd | 12.2 |
| n/a | FreeBSD | < p13 |
Published: 2021-03-26
