Security readout for executives and security teams
Plain-English summary
Linux systems controlling certain multi-chip network switches may crash when a port leaves a software bridge. A VLAN-setting change can be sent to another switch chip where that port does not exist, causing an out-of-bounds memory access. Exposure appears limited to specialized DSA switch configurations. The supplied sources show no active exploitation.
Executive priority
Treat as high priority for network appliances or embedded systems matching the described DSA topology because crashes could interrupt connectivity. First identify applicable hardware, then obtain the vendor-supported kernel update. Systems without DSA multi-chip switching can be deprioritized after verification.
Technical view
Linux DSA incorrectly propagated VLAN-filtering changes through cross-chip notifications. In switch trees with differing port counts, the originating port index could reference a nonexistent port on another chip, causing an array out-of-bounds access and crashes on mv88e6xxx. The cited kernel changes prevent cross-chip synchronization for these notifications.
Likely exposure
Risk is concentrated in Linux systems using DSA multi-chip switch trees, particularly mv88e6xxx, with bridge and VLAN-filtering changes. Systems without this switching hardware and topology are unlikely to encounter the described flaw. The supplied version data is ambiguous, so kernel package and backport status require vendor confirmation.
Exploitation context
The CVSS vector indicates local access, low privileges, low complexity, and no user interaction. However, the sources establish only out-of-bounds access and crashes, not code execution. The CVE is not listed as KEV, and the supplied sources provide no evidence of active exploitation.
Researcher notes
The supplied affected-version record is difficult to interpret and includes 5.2, 0, 5.17.2, and 5.18 alongside commit identifiers. Do not rely on version strings alone; inspect vendor backports. The documented outcome is an array out-of-bounds access and crashes on mv88e6xxx. Remote exploitation and code execution are not established.
Mitigation direction
- Apply a vendor or distribution kernel update containing the applicable cited stable fix.
- Confirm the correct fixed package or backport with the system or appliance vendor.
- Restrict local access and permissions capable of changing bridge or switch configuration.
- If patching is delayed, avoid unnecessary topology changes on confirmed affected systems.
Validation and detection
- Inventory running kernels on appliances and hosts using Linux DSA switching.
- Identify multi-chip DSA topologies and systems using the mv88e6xxx driver.
- Verify packages contain either cited fix or a vendor-confirmed equivalent backport.
- Review kernel logs for out-of-bounds reports, panics, or crashes during bridge changes.
- Use vendor-approved regression testing in a non-production environment after updating.
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.
CVE-2022-49234 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.
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:H/I:H/A:H1.85.9LinuxVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/e1f2a4dd8d433eec393d09273a78a3d3551339cfCVE reference, Linux
- https://git.kernel.org/stable/c/108dc8741c203e9d6ce4e973367f1bac20c7192bCVE 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.