Security readout for executives and security teams
Plain-English summary
This is a Linux kernel crash vulnerability in the Huawei HNS RoCE RDMA driver. A local user with access to the RDMA userspace interface could trigger a NULL pointer dereference, causing system instability or a denial of service. It does not indicate data theft or remote compromise in the provided sources.
Executive priority
Treat as a targeted availability risk for RDMA-capable Linux infrastructure, not a broad internet-facing emergency. Patch during the next appropriate maintenance window, sooner for critical workloads on affected HNS RoCE systems.
Technical view
CVE-2022-49930 is a CWE-476 NULL pointer dereference in RDMA/hns free_mr_init(). In a concurrent path, a mutex could be used before initialization during memory-region deregistration, leading to a kernel fault. CVSS 3.1 is 5.5: local attack vector, low privileges, no user interaction, high availability impact.
Likely exposure
Exposure is likely limited to Linux systems using the HNS RoCE RDMA driver, typically on compatible Huawei RDMA hardware. The source record references Linux kernel versions around 5.18 through stable fixes associated with 6.0.8 and 6.1; downstream distribution backports must be checked.
Exploitation context
The provided sources do not show active exploitation, and this CVE is not listed as KEV. Exploitation requires local access and privileges sufficient to use the RDMA uverbs path. The main business impact is host crash or service disruption, not confidentiality or integrity loss.
Researcher notes
The record ties the fault to mutex initialization ordering in free_mr_init() and shows a crash trace through uverbs memory-region deregistration. Public evidence provided is limited to the CVE record and Linux stable commits; no public exploit or broader impact claims are cited.
Mitigation direction
- Check your Linux distribution advisory for CVE-2022-49930 coverage.
- Update to a kernel containing the referenced stable fixes.
- Prioritize systems using HNS RoCE RDMA hardware or drivers.
- If patches are unavailable, ask the vendor for supported mitigations.
Validation and detection
- Inventory Linux hosts with RDMA enabled and hns_roce modules present.
- Map running kernel builds to vendor advisories or backport notes.
- Confirm whether the stable fix commits are included in deployed kernels.
- Review kernel logs for NULL pointer dereference traces in hns_roce paths.
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-2022-49930 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/0e23e85d86b78e734dd6654f1b69fbaeb5534c81CVE reference, Linux
- https://git.kernel.org/stable/c/12bcaf87d8b66d8cd812479c8a6349dcb245375cCVE 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.