Security readout for executives and security teams
Plain-English summary
CVE-2022-49928 is a Linux kernel SUNRPC flaw that can crash the kernel under a failed sysfs allocation path. The likely business impact is availability loss, not data theft. Exploitation requires local access with low privileges according to CVSS, so prioritize affected Linux servers where untrusted users or workloads can run code.
Executive priority
Treat as a moderate availability risk. Patch during normal kernel maintenance, faster for shared Linux infrastructure where local users or workloads are not fully trusted.
Technical view
The bug is a CWE-476 null pointer dereference in SUNRPC xprt_switch sysfs handling. If xps sysfs allocation fails, later link creation or teardown can dereference NULL and oops the kernel. The CVE record lists CVSS 5.5: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Likely exposure
Linux systems running affected kernel versions in the CVE record, especially hosts using SUNRPC-related paths such as NFS or gssproxy. Exposure is local, not network-direct, based on the CVSS vector.
Exploitation context
No source provided indicates active exploitation, and KEV is false. The reported trigger involves a local write path through gssproxy/SUNRPC and a memory allocation failure condition, producing kernel oops or denial of service.
Researcher notes
The public description is kernel-resolution focused and does not provide a full affected-version range narrative. Avoid assuming remote exploitability. Validate through kernel source history, distribution backports, and presence of the SUNRPC fix commits.
Mitigation direction
- Update to a vendor kernel containing the referenced stable Linux fixes.
- Check Linux distribution advisories for backported fixes for CVE-2022-49928.
- Prioritize multi-user systems and shared workload hosts before single-purpose appliances.
- If patching is delayed, reduce local shell and workload access where practical.
Validation and detection
- Inventory Linux kernel versions across servers and container hosts.
- Compare installed kernels against vendor advisories for CVE-2022-49928.
- Confirm whether the referenced stable commits are present or backported.
- Review crash logs for SUNRPC, gssproxy, sysfs, or null pointer dereference oops messages.
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-2022-49928 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/d59722d088a9d86ce6d9d39979e5d1d669d249f7CVE reference, Linux
- https://git.kernel.org/stable/c/7b189b0aa8dab14b49c31c65af8a982e96e25b62CVE reference, Linux
- https://git.kernel.org/stable/c/cbdeaee94a415800c65a8c3fa04d9664a8b8fb3aCVE 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.