Security readout for executives and security teams
This is a denial-of-service issue in lwext4, a library for handling EXT4 filesystems. A malformed EXT4 image can make vulnerable 1.0.0-era code crash while reading directory entries. The business impact is service or device instability where untrusted filesystem images are processed. Exposure appears limited to software, firmware, or services embedding lwext4 1.0.0 or equivalent 2016-era code and processing untrusted EXT4 filesystem images. The bundle does not identify specific downstream products or CPEs. Prioritize remediation where EXT4 images come from outside the organization or cross trust boundaries. For purely internal, trusted-image use, urgency is lower but still worth tracking because the disclosed condition is simple availability loss. Mitigation focus: Inventory SBOMs and source trees for lwext4 1.0.0 or derived 2016-era code.; Avoid processing untrusted EXT4 images with affected builds until vendor guidance is confirmed.; Run vulnerable parsing in a constrained sandbox where crashes cannot affect core services..
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
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ATT&CK lookup starting points
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CWE-476: Exact CWE lookup
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Open ATT&CK lookupCVE-2025-70099 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/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://github.com/gkostka/lwext4/issues/89CVE reference, mitre
- https://github.com/sigdevel/pocs/blob/main/res/lwext4/1/sig11_2_1_lwext4_ext4_dir_h_126CVE reference, mitre
- https://infosec.exchange/@sigdevel/116668939725424227CVE reference, mitre
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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.