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CVE Record

CVE-2023-53457: FS: JFS: Fix null-ptr-deref Read in txBegin

In the Linux kernel, the following vulnerability has been resolved: FS: JFS: Fix null-ptr-deref Read in txBegin Syzkaller reported an issue where txBegin may be called on a superblock in a read-only mounted filesystem which leads to NULL pointer deref. This could be solved by checking if the filesystem is read-only before calling txBegin, and returning with appropiate error code.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue can crash an affected system when JFS filesystem code incorrectly starts a transaction on a read-only mounted filesystem. The public record describes a NULL pointer dereference, which is primarily a reliability and availability risk. No source in the bundle reports active exploitation.

Executive priority

Handle through normal kernel patch governance, with higher priority for systems using JFS. There is no cited evidence of active exploitation, but kernel crashes can affect service availability and recovery obligations.

Technical view

CVE-2023-53457 is a NULL pointer dereference in Linux JFS txBegin handling. Syzkaller found txBegin could be called against a read-only mounted filesystem superblock. The resolved fix checks whether the filesystem is read-only before calling txBegin and returns an appropriate error.

Likely exposure

Exposure is most likely on Linux systems running affected kernel versions with JFS filesystem support and read-only JFS mount scenarios. Exact exposure depends on distribution kernel backports and whether the referenced stable fixes are present.

Exploitation context

The bundle does not show KEV listing, public exploitation, CVSS scoring, or weaponized details. The described impact is a kernel NULL pointer dereference, so treat it as a possible local denial-of-service condition unless vendor advisories state otherwise.

Researcher notes

Evidence is limited to the CVE record and Linux stable commit references. The root condition is read-only mount state not being checked before txBegin. Avoid assuming remote reachability, privilege escalation, or broad exploitability without additional vendor or kernel analysis.

Mitigation direction

  • Update affected Linux kernels to versions containing the referenced stable fixes.
  • Confirm distribution advisories include CVE-2023-53457 or equivalent JFS txBegin fix.
  • Prioritize systems using JFS or mounting JFS filesystems read-only.
  • Use vendor-supported kernels rather than manually cherry-picking unless operationally required.

Validation and detection

  • Inventory Linux kernel versions across servers and appliances.
  • Identify systems with JFS support enabled or JFS filesystems mounted.
  • Check kernel changelogs for the referenced stable commit identifiers.
  • Confirm no affected kernels remain after patch deployment.
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

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CVE-2023-53457 mapping review

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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

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