Security readout for executives and security teams
Plain-English summary
This is a Linux kernel memory leak in the mISDN device registration path. A local user with low privileges may be able to trigger availability impact, but the sources do not show remote exploitation or data theft. Treat it as a stability and patch hygiene issue for systems using affected Linux kernels.
Executive priority
Patch through normal kernel maintenance, with higher priority on multi-user Linux hosts and shared environments. This is not presented as remotely exploitable or actively exploited, but it can affect availability and should not remain untracked.
Technical view
CVE-2022-49915 fixes a missing device reference release in mISDN_register_device(). After dynamic device-name allocation, put_device() was needed so kobject cleanup can free memory when the refcount reaches zero. The CVSS vector is local, low complexity, low privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely on Linux systems running affected kernel versions from 2.6.30 through listed fixed stable ranges, especially where mISDN code is built or loadable. The source bundle does not provide distribution package mappings, default configuration status, or evidence that internet-facing services are directly exposed.
Exploitation context
The provided data marks KEV as false and gives no cited evidence of active exploitation. The CVSS vector requires local access with low privileges. The described impact is availability through memory leakage, not confidentiality or integrity compromise.
Researcher notes
Focus validation on kernel lineage and the mISDN_register_device() fix. The key remediation signal is the added put_device() handling and class assignment before release. The bundle lacks distro-specific fixed package versions, runtime prerequisites, and exploit evidence.
Mitigation direction
- Apply a vendor Linux kernel update containing the referenced stable fixes.
- Prioritize systems where untrusted local users can execute code.
- Check distribution advisories for package names and backport status.
- Where unused, review vendor guidance for disabling mISDN support.
- Reboot or otherwise activate the fixed kernel after updating.
Validation and detection
- Inventory running kernel versions against the affected version list.
- Confirm vendor packages include a backport for CVE-2022-49915.
- Check whether mISDN support is built, available, or loaded.
- Verify the active kernel changed after patching.
- Record exceptions where vendor mapping is unavailable.
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-401: Exact CWE lookup
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Open ATT&CK lookupCVE-2022-49915 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/d1d1aede313eb2b9a84afd60ff6cfb7c33631e0eCVE reference, Linux
- https://git.kernel.org/stable/c/080aabfb29b2ee9cbb8894a1d039651943d3773eCVE reference, Linux
- https://git.kernel.org/stable/c/a636fc5a7cabd05699b5692ad838c2c7a3abec7bCVE reference, Linux
- https://git.kernel.org/stable/c/2ff6b669523d3b3d253a044fa9636a67d0694995CVE reference, Linux
- https://git.kernel.org/stable/c/e77d213843e67b4373285712699b692f9c743f61CVE reference, Linux
- https://git.kernel.org/stable/c/029d5b7688a2f3a86f2a3be5a6ba9cc968c80e41CVE reference, Linux
- https://git.kernel.org/stable/c/0d4e91efcaee081e919b3c50e875ecbb84290e41CVE reference, Linux
- https://git.kernel.org/stable/c/e7d1d4d9ac0dfa40be4c2c8abd0731659869b297CVE 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.
Missing Release of Memory after Effective Lifetime
Missing Release of Memory after Effective Lifetime represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.