Security readout for executives and security teams
Plain-English summary
CVE-2022-49464 is a Linux kernel memory-safety flaw in EROFS, a read-only filesystem. A local, low-privileged actor could potentially trigger serious confidentiality, integrity, and availability impacts if an affected kernel processes the vulnerable EROFS ztailpacking path.
Executive priority
Treat as high priority for Linux fleets using affected kernels, especially multi-user or workload-hosting systems. Prioritize normal kernel patch cycles unless vendor guidance or local exposure indicates emergency handling.
Technical view
The issue is a use-after-free/buffer copy overflow in z_erofs_shifted_transform during EROFS decompression for ztailpacking. The CVE cites a KASAN report showing memcpy reading freed memory. CVSS 3.1 is 7.8 with local attack vector, low complexity, low privileges, no user interaction, and high CIA impact.
Likely exposure
Exposure is likely limited to Linux systems running affected kernel versions or backports with the vulnerable EROFS ztailpacking implementation. The source bundle does not prove exposure for every distribution kernel; vendor backport status must be checked.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not report active exploitation. The CVSS vector indicates local, low-privileged exploitation conditions without user interaction, but the sources do not provide validated exploit details.
Researcher notes
Evidence supports a kernel memory safety issue in EROFS ztailpacking with severe local impact. The provided data is incomplete on distribution-specific affected ranges, exploitability in default configurations, and operational mitigations beyond applying kernel fixes.
Mitigation direction
- Update affected Linux kernels using vendor or stable kernel guidance.
- Confirm the referenced stable fixes are present or backported.
- Restrict local users or workloads that can trigger EROFS processing where feasible.
- Avoid relying on version strings alone; verify vendor patch status.
Validation and detection
- Inventory Linux kernel versions across servers, endpoints, containers, and appliances.
- Check whether EROFS support is enabled or used in relevant environments.
- Map installed kernels against vendor advisories and stable fix commits.
- Review kernel crash, KASAN, or filesystem error logs for related EROFS failures.
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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CWE-416: Exact CWE lookup
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Open ATT&CK lookupCVE-2022-49464 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.
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:H/I:H/A:H1.85.9CISA-ADPVulnerability 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.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/4d53a625f29074e7b8236c2c0e0922edb7608df9CVE reference, Linux
- https://git.kernel.org/stable/c/6b59e1907f58cf877c563dcf013159eb9f994b64CVE reference, Linux
- https://git.kernel.org/stable/c/dcbe6803fffd387f72b48c2373b5f5ed12a5804bCVE 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.