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CVE-2026-49422 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:8.4 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://security.freebsd.org/advisories/FreeBSD-SA-26:43.tcp.asc [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-416Use After Free[email protected]

Affected Products

ProductVersions
freebsd freebsd
14.3 -
14.3 p1
14.3 p10
14.3 p11
14.3 p12

CPE

  • cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p1:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p10:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p11:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p12:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p13:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p14:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p15:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p2:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p3:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p4:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p5:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p6:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p7:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p8:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.3:p9:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.4:-:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.4:p1:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.4:p2:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.4:p3:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.4:p4:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.4:p5:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.4:p6:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:14.4:rc1:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.0:-:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.0:p10:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.0:p5:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.0:p6:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.0:p7:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.0:p8:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.0:p9:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.1:-:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.1:rc2:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:15.1:rc3-p1:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-49422
NVD Published Date:
Aug 19, 2026
NVD Last Modified:
Sep 1, 2026
Source:
[email protected]
CVE-2026-49422 Details - Not Deferred