LiveActive security incident?Get immediate response
CVE Record

CVE-2023-53766: FS: JFS: Check for read-only mounted filesystem in txBegin

In the Linux kernel, the following vulnerability has been resolved: FS: JFS: Check for read-only mounted filesystem in txBegin This patch adds a check for read-only mounted filesystem in txBegin before starting a transaction potentially saving from NULL pointer deref.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2023-53766 is a Linux kernel JFS filesystem flaw. The kernel fix adds a read-only mount check before starting a JFS transaction, avoiding a possible NULL pointer dereference. The public record does not provide CVSS scoring or evidence of active exploitation.

Executive priority

Treat as a routine kernel maintenance item unless JFS is used in sensitive or multi-user systems. No source-provided evidence supports emergency response or active exploitation.

Technical view

The issue is in JFS txBegin handling. On a read-only mounted filesystem, transaction startup could proceed into a path that may dereference NULL. Upstream stable commits add a read-only filesystem check before starting the transaction.

Likely exposure

Exposure is most relevant to Linux systems with JFS support and read-only JFS mounts. Exact exposure depends on kernel version, distribution backports, and whether JFS is enabled or used.

Exploitation context

The provided sources do not indicate active exploitation, public weaponization, or CISA KEV listing. Impact evidence is limited to NULL pointer dereference risk in kernel JFS handling.

Researcher notes

The record lacks CVSS, CWE, detailed trigger conditions, and exploitability analysis. Assessment should focus on JFS txBegin behavior, read-only mount paths, and whether downstream kernels incorporated the listed stable commits.

Mitigation direction

  • Apply vendor kernel updates that include the referenced stable JFS fixes.
  • Check Linux distribution advisories for backported fixes and supported kernel packages.
  • Prioritize systems that use or permit JFS mounts.
  • Avoid relying on upstream version strings alone; confirm distribution patch status.

Validation and detection

  • Inventory Linux hosts for JFS kernel support and mounted JFS filesystems.
  • Compare running kernels against vendor advisories or referenced stable commits.
  • Review crash logs for JFS-related NULL pointer dereference indicators.
  • Confirm patched kernels are running after reboot, not only installed.
Prepared
Confidence
medium
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

CVE-2023-53766 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
3Timeline events
0ADP providers
9Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2unaffected
LinuxLinux2.6.12, 0, 4.14.324, 4.19.293, 5.4.255, 5.10.192, 5.15.123, 6.1.42, 6.4.7, 6.5affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.