Security readout for executives and security teams
Plain-English summary
This Linux kernel issue is a defensive fix for a possible NULL pointer dereference in x86 ACPI serial-device enumeration logic. If reachable, it could crash the kernel and cause a local denial of service. The source notes the vulnerable call path is not currently expected to receive a NULL ACPI companion.
Executive priority
Treat this as a routine but real availability risk for Linux systems, not an emergency internet-facing compromise. Patch through normal kernel maintenance, faster for multi-user or shared workload hosts where local denial of service has higher business impact.
Technical view
CVE-2024-56782 is CWE-476 in Linux ACPI x86 code. acpi_quirk_skip_serdev_enumeration() could call acpi_dev_hid_match() with adev == NULL, which dereferences unconditionally. The fix adds a NULL check before that call. CVSS is 5.5, local attack vector, low complexity, low privileges, availability impact high.
Likely exposure
Exposure appears limited to Linux systems running affected kernel versions identified in the CVE record, including 6.9, 6.12.5, and 6.13. The record also contains version/status details that require distribution-level confirmation, so vulnerability managers should map their installed kernels against vendor advisories and backports.
Exploitation context
The bundle provides no evidence of active exploitation, and KEV status is false. The CVSS vector requires local access with low privileges and affects availability only. The kernel note says the function is not currently called with the problematic NULL state, which lowers practical urgency but does not remove risk.
Researcher notes
The key uncertainty is reachability. The upstream description says the vulnerable helper is not currently called with a parent lacking an ACPI companion. Analysis should focus on whether any platform, driver path, or downstream change can make controller_parent lack an ACPI companion without inventing unsupported exploitability claims.
Mitigation direction
- Upgrade to a kernel package containing the referenced stable fix.
- Check Linux distribution advisories for backported fixes and exact package versions.
- Prioritize shared systems where untrusted local users can run workloads.
- Apply normal kernel rollout testing before production deployment.
- Track vendor guidance if fixed packages are not yet available.
Validation and detection
- Inventory Linux kernel versions across affected fleets.
- Compare installed kernels with the CVE record and distribution advisories.
- Confirm the stable fix is present through vendor package changelogs.
- Review recent kernel crash reports for ACPI or serdev-related traces.
- Validate post-update systems boot and enumerate hardware normally.
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-2024-56782 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/e173bce05f7032a8b4964cfef82a4b7668f5f3afCVE reference, Linux
- https://git.kernel.org/stable/c/4a49194f587a62d972b602e3e1a2c3cfe6567966CVE 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.