CVE-2026-7270
Published: 30 April 2026
Summary
CVE-2026-7270 is a high-severity Operator Precedence Logic Error (CWE-783) vulnerability in Freebsd Freebsd. Its CVSS base score is 7.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 0.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-7270 is an operator precedence bug (CWE-783) in the FreeBSD kernel that triggers a buffer overflow, enabling attacker-controlled data to overwrite adjacent execve(2) argument buffers. This vulnerability affects FreeBSD systems, with the issue published on 2026-04-30 and assigned a CVSS v3.1 base score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
The vulnerability is exploitable by an unprivileged local user requiring low privileges (PR:L) and low attack complexity (AC:L), with no user interaction needed. Successful exploitation allows the attacker to achieve superuser privileges, granting high impacts on confidentiality, integrity, and availability.
The FreeBSD security advisory SA-26:13.exec, available at https://security.freebsd.org/advisories/FreeBSD-SA-26:13.exec.asc, provides details on mitigation measures and patches.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-26353
Vulnerability details
An operator precedence bug in the kernel results in a scenario where a buffer overflow causes attacker-controlled data to overwrite adjacent execve(2) argument buffers. The bug may be exploitable by an unprivileged user to obtain superuser privileges.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Local kernel buffer overflow in execve(2) argument handling directly enables privilege escalation from unprivileged user to root on FreeBSD.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly remediates the kernel operator precedence bug causing buffer overflow by requiring timely installation of patches from FreeBSD-SA-26:13.exec.
Deploys memory protection mechanisms like ASLR, stack canaries, and NX bits to block exploitation of the buffer overflow for privilege escalation.
Mandates validation of execve argument buffer inputs to restrict attacker-controlled data from triggering the overflow in kernel processing.