Security readout for executives and security teams
Plain-English summary
CVE-2023-45898 is a Linux kernel memory-safety flaw in ext4 handling. A local, low-privileged user may be able to cause serious confidentiality, integrity, and availability impact on affected kernels. The source bundle identifies Linux kernel versions before 6.5.4 as affected, but product-specific exposure is incomplete.
Executive priority
Treat as a high-priority kernel maintenance issue, not an internet-facing emergency based on current evidence. Patch exposed multi-user Linux systems promptly, validate vendor backports, and track Siemens or distribution advisories for product-specific applicability.
Technical view
The issue is a CWE-416 use-after-free in fs/ext4/extents_status.c, related to ext4_es_insert_extent. CVSS 3.1 is 7.8 with local attack vector, low complexity, low privileges, no user interaction, unchanged scope, and high CIA impact. Upstream references include a Linux commit and the 6.5.4 changelog.
Likely exposure
Likely exposure is Linux systems running kernels before 6.5.4, especially where local users or services can interact with ext4-backed filesystems. The affected vendor/product fields are listed as n/a, so distribution, appliance, and Siemens product impact must be confirmed from vendor advisories.
Exploitation context
The bundle does not identify active exploitation, and KEV is false. The CVSS vector indicates local exploitation requiring low privileges and no user interaction. No exploit maturity, public weaponization, or practical exploitation detail is provided in the supplied sources.
Researcher notes
Evidence supports a local Linux kernel ext4 use-after-free fixed upstream around 6.5.4. The bundle lacks detailed affected product matrices, exploit proof, and exploitation-in-the-wild confirmation. Avoid assuming all vendor kernels before 6.5.4 are vulnerable because backports may change exposure.
Mitigation direction
- Upgrade to Linux kernel 6.5.4 or a vendor kernel containing the upstream fix.
- Check Linux distribution advisories for backported fixes before assuming version numbers alone are vulnerable.
- Review Siemens advisories if Siemens products are in scope.
- Prioritize multi-user Linux hosts and systems exposing local service accounts.
- Apply standard least-privilege controls for local accounts while patching is scheduled.
Validation and detection
- Inventory Linux kernel versions across servers, appliances, and images.
- Confirm whether ext4-backed filesystems are used on potentially affected systems.
- Verify vendor kernel packages include the fix for CVE-2023-45898.
- Check vulnerability scanner results against actual vendor backport status.
- Review local account exposure on systems that cannot be patched quickly.
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-416: 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-2023-45898 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 publishedCVE Program
The CVE record was published.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- 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://lore.kernel.org/lkml/aa03f191-445c-0d2e-d6d7-0a3208d7df7a%40huawei.com/T/CVE reference, mitre
- https://www.spinics.net/lists/stable-commits/msg317086.htmlCVE reference, mitre
- https://lkml.org/lkml/2023/8/13/477CVE reference, mitre
- https://github.com/torvalds/linux/commit/768d612f79822d30a1e7d132a4d4b05337ce42ecCVE reference, mitre
- https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5.4CVE reference, mitre
- https://cert-portal.siemens.com/productcert/html/ssa-398330.htmlCVE reference, siemens-SADP
- https://cert-portal.siemens.com/productcert/html/ssa-265688.htmlCVE reference, siemens-SADP
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.