Security readout for executives and security teams
Plain-English summary
This is a Linux kernel availability bug in Renesas RZN1 pin control handling. If triggered locally by a low-privileged user, the kernel could crash. The source bundle does not indicate data theft, privilege escalation, remote exploitation, or active exploitation.
Executive priority
Handle through standard kernel patch management, with higher priority for embedded or operational systems using Renesas RZN1 hardware. Business risk is primarily outage or reboot, not confirmed compromise.
Technical view
CVE-2022-49449 is a CWE-476 NULL pointer dereference in sh_pfc_map_resources(). platform_get_resource() can return NULL, and the vulnerable code could use that pointer before safe resource mapping. Stable kernel fixes reorder the logic and use devm_platform_get_and_ioremap_resource().
Likely exposure
Exposure appears limited to affected Linux kernel builds where Renesas RZN1 pinctrl code is present and reachable. The provided affected data names Linux versions including 4.20, 5.10.121, 5.15.46, 5.17.14, 5.18.3, and 5.19, but distro backport status is not provided.
Exploitation context
The CVSS vector is local, low complexity, low privileges, no user interaction, with high availability impact only. The bundle says KEV is false and provides no cited evidence of active exploitation or public weaponization.
Researcher notes
The source bundle identifies the root cause and fix direction but does not include distro-specific advisories, exploit reports, or full affected hardware scope. Validate exposure against actual kernel configuration, hardware, and vendor backports.
Mitigation direction
- Update affected Linux kernels to versions containing the referenced stable fixes.
- Check Linux distribution or device vendor guidance for backported kernel packages.
- Prioritize systems using Renesas RZN1 platforms or custom kernels with this driver.
- Avoid deploying affected kernel builds on relevant platforms until patched.
Validation and detection
- Inventory deployed kernel versions and compare them with vendor fixed releases.
- Confirm whether Renesas RZN1 pinctrl support is present in affected builds.
- Review kernel package changelogs for the referenced stable commit IDs.
- Monitor relevant systems for kernel crash reports tied to pinctrl initialization.
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-2022-49449 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/b646e0cfeb38bf5f1944fd548f1dfa9b129fa00cCVE reference, Linux
- https://git.kernel.org/stable/c/c16b59d445135c8026a04e388d8b2762feaa3b3bCVE reference, Linux
- https://git.kernel.org/stable/c/34c719b8fdfbd0c7c54cae56e6b0f16e9f8bf03eCVE reference, Linux
- https://git.kernel.org/stable/c/01f9e02e0f13df3fd291676dc80054e977be1601CVE reference, Linux
- https://git.kernel.org/stable/c/2f661477c2bb8068194dbba9738d05219f111c6eCVE 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.