Security readout for executives and security teams
Plain-English summary
CVE-2023-53220 is a Linux kernel crash bug in the az6007 media driver. A local user could trigger a null pointer dereference through malformed I2C message data, causing denial of service. The provided sources do not indicate data theft, privilege escalation, remote exploitation, or active exploitation.
Executive priority
Treat as a routine but real availability risk. It is not evidenced as remotely exploitable or actively exploited, but kernel denial-of-service flaws can disrupt shared or operational Linux systems. Patch through normal kernel maintenance, faster where untrusted local users can access affected hosts.
Technical view
The flaw is CWE-476 in az6007_i2c_xfer(). A user-controlled message with a null buffer and zero length could pass earlier buffer checks, then be dereferenced at msg[i].buf[0]. The kernel fix adds a length check to prevent the crash. CVSS 3.1 is 5.5, local attack vector, low privileges, availability impact high.
Likely exposure
Exposure is likely limited to Linux systems running affected kernel versions where the az6007 media driver path is present and reachable by a local low-privileged user. Confirm through distribution kernel packages and backports, because the CVE record lists upstream stable commits rather than product-specific vendor advisories.
Exploitation context
The CVE record marks this as local, low-complexity, and requiring low privileges with no user interaction. The source bundle says KEV is false, and no provided source states active exploitation. Impact is availability only: a kernel crash or denial of service.
Researcher notes
Evidence is strongest for root cause and upstream remediation, because the CVE description includes the faulty condition and stable commit references. Evidence is incomplete for distribution-specific affected packages, exploit availability, and operational mitigations beyond applying fixed kernels or vendor backports.
Mitigation direction
- Apply Linux vendor or distribution kernel updates containing the referenced stable fixes.
- Confirm whether your running kernel includes the az6007_i2c_xfer() length-check fix.
- Use vendor guidance for backports if upstream version numbers do not match.
- Prioritize shared workstations, appliances, or media systems where local users exist.
Validation and detection
- Inventory Linux kernel versions against the affected ranges in the CVE record.
- Check whether the az6007 media driver is built, packaged, or loaded on relevant systems.
- Verify installed vendor kernel changelogs reference the stable fix commits or CVE-2023-53220.
- Confirm no exposed operational dependency would prevent timely kernel patching.
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-476: 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 lookupCVE-2023-53220 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
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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:N/A:H1.83.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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://git.kernel.org/stable/c/c6763fefa267f6e62595a6ac1f57815d99fc90b7CVE reference, Linux
- https://git.kernel.org/stable/c/adcb73f8ce9aec48b1f85223f401c1574015d8d2CVE reference, Linux
- https://git.kernel.org/stable/c/991c77fe18c6f374bbf83376f8c42550aa565662CVE reference, Linux
- https://git.kernel.org/stable/c/a9def3e9718a4dc756f48db147d42ec41a966240CVE reference, Linux
- https://git.kernel.org/stable/c/5b1ea100ad3695025969dc4693f307877fb688d6CVE reference, Linux
- https://git.kernel.org/stable/c/6ab7ea4e17d6a605d05308adf8f3408924770cbaCVE reference, Linux
- https://git.kernel.org/stable/c/a1110f19d4940e4185251d072cbb0ff51486a1e7CVE reference, Linux
- https://git.kernel.org/stable/c/1047f9343011f2cedc73c64829686206a7e9fc3fCVE reference, Linux
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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.