Security readout for executives and security teams
Plain-English summary
A Linux ext4 filesystem function could fail while processing encrypted, case-insensitive filenames, but its callers did not consistently handle that failure. This could cause unsafe filesystem behavior affecting confidentiality, integrity, or availability. Exploitation requires local, low-privileged access according to the supplied CVSS assessment.
Executive priority
Prioritize remediation on multi-user or otherwise untrusted Linux systems using ext4, especially where encryption and casefolding are enabled. Treat this as high priority but below remotely exploitable critical flaws because exploitation requires existing local access. Require vendor-confirmed package mapping before declaring systems remediated.
Technical view
Callers of ext4_dirhash() failed to propagate errors that became realistically possible after support for encrypted, casefolded filenames. The referenced Linux stable commits correct this error handling. The CVSS 3.1 score is 7.8 with local access, low complexity, low privileges, no user interaction, and potentially high impact.
Likely exposure
Exposure is limited to Linux systems using ext4 without the applicable stable fix. Encrypted and casefolded filename handling is particularly relevant. The supplied version data does not provide clear range semantics, so administrators should verify distribution backports rather than relying only on kernel version strings.
Exploitation context
The source bundle marks this CVE as absent from KEV and provides no evidence of active exploitation or public weaponization. The CVSS vector indicates that an attacker would need local, low-privileged access. Evidence is insufficient to determine practical exploit reliability or whether specific configurations are independently required.
Researcher notes
The core defect is missing error propagation around ext4_dirhash(), not a documented standalone memory-corruption primitive. The supplied CVE data contains ambiguous version entries and no CWE classification. Analysis should focus on the affected call paths, feature prerequisites, and distribution backports without inferring exploitation mechanics absent from the sources.
Mitigation direction
- Install a vendor-supported kernel containing the applicable referenced stable fix.
- Check distribution security advisories for backported fixes and exact package versions.
- Reboot into the updated kernel after installation.
- Restrict unnecessary local accounts while remediation is pending.
Validation and detection
- Record the running kernel version and installed kernel package.
- Confirm whether affected systems use ext4 filesystems.
- Identify use of ext4 encryption and casefolding features.
- Verify the vendor package includes an applicable referenced commit or backport.
- Confirm the updated kernel is running after reboot.
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.
CVE-2023-53473 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.
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:H1.85.9LinuxVulnerability 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.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/b2531936118deb3f479c4fa1bcd787b74b8faa6aCVE reference, Linux
- https://git.kernel.org/stable/c/f68876aeef96ef8b708ab10b9cb47ce0a5adb424CVE reference, Linux
- https://git.kernel.org/stable/c/70d579aefa652a06af97e013e3fbbabbe5a43553CVE reference, Linux
- https://git.kernel.org/stable/c/c1fae027da61fe8e7eb99f7244297e81bc0f1e43CVE reference, Linux
- https://git.kernel.org/stable/c/4b3cb1d108bfc2aebb0d7c8a52261a53cf7f5786CVE 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.