Security readout for executives and security teams
Plain-English summary
CVE-2022-48919 is a Linux kernel bug in the CIFS/SMB3 filesystem mount path. If a CIFS mount fails in a specific way, the kernel can free the same context twice, causing a use-after-free. Business risk is mainly to Linux systems that allow CIFS mounts. No active exploitation is reported in the provided sources.
Executive priority
Treat as a scheduled kernel remediation item, prioritized for servers or workstations that use CIFS mounts. Escalate if untrusted users can trigger mounts. Current sources do not justify emergency response absent exploit evidence, but kernel memory-safety bugs should not remain unpatched.
Technical view
The flaw is in cifs_smb3_do_mount() when cifs_get_root() fails. deactivate_locked_super() can lead to delayed_free() freeing the context, but the error path could then free related resources again. The source includes a KASAN use-after-free trace involving rcu_cblist_dequeue after a mount syscall path.
Likely exposure
Exposure is most relevant on Linux systems using or permitting CIFS/SMB3 mounts. The provided metadata lists Linux kernel versions around 5.11, 5.15.27, 5.16.13, and 5.17, but the exact affected/fixed range should be confirmed against vendor kernel advisories and the referenced stable commits.
Exploitation context
The trace shows the issue triggered through the mount syscall path during a failed CIFS/SMB3 mount. Practical exploitation would likely require local ability to initiate CIFS mounts or equivalent privileges. The sources do not provide evidence of remote exploitation, public weaponization, or inclusion in CISA KEV.
Researcher notes
Severity, CVSS, CWE, and exploit status are not provided in the source bundle. The strongest evidence is the upstream Linux resolution text and stable commit references. Version metadata appears incomplete or ambiguous, so rely on distro advisories and commit inclusion checks for precise exposure decisions.
Mitigation direction
- Update Linux kernels using vendor packages that include the referenced CIFS stable fixes.
- Confirm distribution advisories before assuming upstream version numbers map directly to packaged kernels.
- Restrict CIFS mount capability to trusted administrators and controlled automation.
- Disable or avoid loading CIFS where it is not operationally required.
- Monitor vendor security channels for backported fixes and affected-version clarification.
Validation and detection
- Inventory Linux hosts and kernel versions that use CIFS or SMB3 mounts.
- Check whether installed kernels include the referenced stable commits or vendor backports.
- Review mount policies for who can initiate CIFS mounts.
- Look for kernel logs mentioning CIFS mount failures or KASAN use-after-free traces.
- Track remediation status through configuration management or vulnerability scanning records.
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
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CVE-2022-48919 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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
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/546d60859ecf13380fcabcbeace53a5971493a2bCVE reference, Linux
- https://git.kernel.org/stable/c/563431c1f3c8f2230e4a9c445fa23758742bc4f0CVE reference, Linux
- https://git.kernel.org/stable/c/3d6cc9898efdfb062efb74dc18cfc700e082f5d5CVE 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.