CVE-2026-49422
HIGH
MEDIUM
Priority: 0.01
BB Relevance:
52/100
Published: 2026-08-19
Modified: 2026-11-09
First seen: 2026-11-09
Status: active
Attack Surface
Low Complexity
No Auth
No Interaction
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
None
UI:
None
S:
Unchanged
C:
High
I:
High
A:
High
Description
The RACK setsockopt(2) handler drops the connection lock in order to copy option data from userspace, then reacquires the lock. After reacquiring, it verifies that the TCP stack had not been switched away, but did not reload its pointer to the stack's per-connection control block. If userspace switches stacks twice during this window, the check will succeed but the saved pointer will refer to freed memory. The bug may be exploitable by an unprivileged local user to escalate privileges.
Weakness Classification (1)
Affected Software (38)
| Vendor | Product | Version |
|---|---|---|
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.3 |
| freebsd | freebsd | 14.4 |
| freebsd | freebsd | 14.4 |
| freebsd | freebsd | 14.4 |
| freebsd | freebsd | 14.4 |
| freebsd | freebsd | 14.4 |
| freebsd | freebsd | 14.4 |
| freebsd | freebsd | 14.4 |
| freebsd | freebsd | 14.4 |
| freebsd | freebsd | 15.0 |
| freebsd | freebsd | 15.0 |
| freebsd | freebsd | 15.0 |
| freebsd | freebsd | 15.0 |
| freebsd | freebsd | 15.0 |
| freebsd | freebsd | 15.0 |
Showing 30 of 38 entries
References & Advisories (1)
Vendor Advisory