Security readout for executives and security teams
Plain-English summary
CVE-2022-3775 is a GRUB2 bootloader flaw in font rendering. A local attacker with some privileges could trigger heap memory corruption using crafted Unicode-related input. The main business risk is boot integrity or availability disruption; arbitrary code execution is described as complex but not ruled out.
Executive priority
Treat as a high-priority infrastructure patching item, not an emergency internet-exposed issue. Prioritize shared servers, sensitive workstations, and systems where local users or delegated administrators exist.
Technical view
GRUB2 font code does not properly validate glyph width and height against bitmap size when rendering certain Unicode sequences. This can cause an out-of-bounds heap write, mapped to CWE-787. The CVSS 3.1 score is 7.1 with local attack vector, low privileges required, and high integrity and availability impact.
Likely exposure
Systems using GRUB2 versions up to 2.06 may be exposed, especially Linux distributions that had not backported a fix. This is not described as remotely exploitable; CVSS indicates local access and low privileges are required.
Exploitation context
The source bundle does not show CISA KEV listing or public active exploitation evidence. Sources describe potential memory corruption and availability issues, with arbitrary code execution possible but not confirmed.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, affected range, CWE mapping, and vendor references. Do not assume exploitability beyond local low-privilege triggering and potential memory corruption unless vendor or KEV evidence changes.
Mitigation direction
- Inventory systems using GRUB2 and identify versions up to 2.06.
- Apply GRUB2 security updates from the operating system vendor.
- Review Red Hat and Gentoo advisories for affected package status.
- Follow distro-specific bootloader update procedures after package installation.
- Restrict unnecessary local access on systems pending remediation.
Validation and detection
- Check installed GRUB2 package versions against vendor fixed-version guidance.
- Confirm vendor changelogs or advisories reference CVE-2022-3775.
- Verify bootloader update steps completed successfully on representative systems.
- Reboot test systems during maintenance to confirm normal startup.
- Track exceptions where vendor fix status is unclear.
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.
CWE-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2022-3775 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
- High
- CVSS
- 7.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
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.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H1.85.2CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://access.redhat.com/security/cve/cve-2022-3775CVE reference, redhat
- GLSA-202311-14CVE reference, redhat · vendor-advisory
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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.