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CVE Record

CVE-2023-54314: media: af9005: Fix null-ptr-deref in af9005_i2c_xfer

In the Linux kernel, the following vulnerability has been resolved: media: af9005: Fix null-ptr-deref in af9005_i2c_xfer In af9005_i2c_xfer, msg is controlled by user. When msg[i].buf is null and msg[i].len is zero, former checks on msg[i].buf would be passed. Malicious data finally reach af9005_i2c_xfer. If accessing msg[i].buf[0] without sanity check, null ptr deref would happen. We add check on msg[i].len to prevent crash. Similar commit: commit 0ed554fd769a ("media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()")

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel crash bug in the af9005 media driver. Malformed user-controlled message data can reach driver code that dereferences a null buffer. The documented impact is denial of service through a kernel crash, not data theft or code execution.

Executive priority

Treat as a routine-to-moderate kernel availability issue. Patch through normal kernel maintenance, with higher priority for shared, multi-user, or device-accessible Linux systems where crashes could disrupt operations.

Technical view

CVE-2023-54314 fixes a null pointer dereference in af9005_i2c_xfer. When msg[i].buf is null and msg[i].len is zero, earlier checks can be bypassed and later code may access msg[i].buf[0]. The kernel fix adds a length check before access.

Likely exposure

Exposure is most likely on Linux systems with affected kernel builds where the af9005 DVB USB media driver is present and reachable. Exact exposure depends on kernel version, distribution backports, driver configuration, and relevant hardware or device access.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The described outcome is a null pointer dereference causing a crash. The bundle does not support claims of remote exploitation or privilege escalation.

Researcher notes

Evidence is limited to the CVE description and Linux stable commit references. No CVSS, CWE, exploit status, or detailed vendor-specific affected matrix is provided. Avoid expanding impact beyond denial of service unless new vendor evidence appears.

Mitigation direction

  • Apply Linux vendor or distribution kernel updates containing the referenced stable fixes.
  • Prioritize systems exposing DVB USB/media driver functionality to untrusted local users.
  • If patching is delayed, check vendor guidance for supported temporary controls.
  • Track all affected kernel branches through distribution advisories and package changelogs.

Validation and detection

  • Inventory Linux kernel versions and distribution patch levels across affected assets.
  • Check whether af9005 or related DVB USB media driver support is built or loadable.
  • Confirm installed kernel changelogs reference CVE-2023-54314 or the stable fix commits.
  • Validate remediation in staging before production kernel rollout where uptime is critical.
Prepared
Confidence
medium
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2023-54314 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
3Timeline events
0ADP providers
9Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxaf4e067e1dcf926d9523dff11e46c45fd9fa9da2, af4e067e1dcf926d9523dff11e46c45fd9fa9da2, af4e067e1dcf926d9523dff11e46c45fd9fa9da2, af4e067e1dcf926d9523dff11e46c45fd9fa9da2, af4e067e1dcf926d9523dff11e46c45fd9fa9da2, af4e067e1dcf926d9523dff11e46c45fd9fa9da2, af4e067e1dcf926d9523dff11e46c45fd9fa9da2, af4e067e1dcf926d9523dff11e46c45fd9fa9da2unaffected
LinuxLinux2.6.23, 0, 4.14.326, 4.19.295, 5.4.257, 5.10.197, 5.15.133, 6.1.55, 6.5.5, 6.6affected
Weakness

CWE details

No CWE listed

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