Security readout for executives and security teams
Plain-English summary
This FreeBSD kernel issue weakens a hardware protection during some system calls. By itself, the source says it needs another kernel bug to become an exploit, but it can make an exploit chain more viable on affected FreeBSD systems.
Executive priority
Treat this as a targeted hardening and patching priority, not an emergency based on the provided evidence. Patch affected FreeBSD systems during the next appropriate security maintenance window, faster for multi-user or high-value systems.
Technical view
A system call that triggers a fault could leave SMAP disabled for the rest of that system call. SMAP normally limits kernel access to user memory, so this reduces a kernel hardening boundary and may assist exploitation when paired with another kernel vulnerability.
Likely exposure
Exposure is likely limited to systems running the named FreeBSD builds: 13.0-STABLE before n245764-876ffe28796c, 12.2-STABLE before r369857, 13.0-RELEASE before p1, or 12.2-RELEASE before p7.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not marked KEV. The described risk is exploit chaining: this weakness could help craft an exploit when combined with other kernel bugs.
Researcher notes
Severity, CVSS, and CWE details are absent in the provided bundle. The key technical condition is SMAP being disabled after a syscall fault, with practical impact dependent on a second kernel bug or exploit chain.
Mitigation direction
- Update affected FreeBSD systems to the fixed release or STABLE revision named by FreeBSD.
- Check the FreeBSD security advisory for vendor-specific update instructions.
- Review the NetApp advisory for applicability to any NetApp-managed environments.
- Prioritize systems with local users, shared hosting, or exposed administrative access.
Validation and detection
- Inventory FreeBSD hosts and confirm release, patch level, and STABLE revision.
- Compare each system against the fixed versions listed in the CVE and FreeBSD advisory.
- Review kernel update records to confirm the security advisory fix was applied.
- Check NetApp advisory status before assuming any NetApp product is affected.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-29628 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://security.freebsd.org/advisories/FreeBSD-SA-21:11.smap.ascCVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210713-0002/CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.