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CVE Record

CVE-2021-47426: bpf, s390: Fix potential memory leak about jit_data

In the Linux kernel, the following vulnerability has been resolved: bpf, s390: Fix potential memory leak about jit_data Make sure to free jit_data through kfree() in the error path.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel memory leak in the BPF JIT code for s390 systems. In an error path, allocated jit_data was not freed. The likely business impact is resource exhaustion or instability on affected Linux systems, but the public bundle provides no CVSS score, no confirmed exploitation, and limited impact detail.

Executive priority

Prioritize this in normal kernel patch management for any Linux s390 estate. Escalate only if critical s390 workloads run affected kernels or vendor advisories assign higher severity. Current public evidence does not support emergency treatment.

Technical view

CVE-2021-47426 fixes a potential memory leak in Linux kernel bpf/s390 JIT handling. The source says jit_data must be freed with kfree() in the error path. The affected data identifies Linux kernel versions including 5.4, 5.4.153, 5.10.73, 5.14.12, and 5.15, with stable kernel commits referenced as fixes.

Likely exposure

Exposure appears limited to Linux systems using the s390 BPF JIT code path on affected kernel versions. Organizations without IBM s390 or s390x Linux workloads are less likely to be exposed. The provided affected-version data is incomplete, so distribution-specific advisories should drive final scoping.

Exploitation context

The bundle does not cite active exploitation, and KEV is false. No public exploit status, attack prerequisites, or exploitability details are provided. Treat this as a kernel reliability and resource-management issue until vendor advisories provide clearer severity or exploitation information.

Researcher notes

The key evidence is narrow: a kernel stable fix freeing jit_data in the bpf/s390 JIT error path. The bundle lacks CVSS, CWE, exploitability analysis, and precise distribution package mapping. Avoid broad Linux exposure claims beyond affected s390 BPF JIT code.

Mitigation direction

  • Apply vendor kernel updates containing the referenced stable Linux fixes.
  • Prioritize Linux s390 systems running affected kernel branches.
  • Check distribution advisories for exact fixed package versions.
  • Reboot systems if required for the patched kernel to run.
  • If patching is delayed, follow vendor guidance for temporary risk reduction.

Validation and detection

  • Inventory Linux s390 or s390x systems and running kernel versions.
  • Confirm installed kernel packages include the referenced stable fix commits.
  • Verify the active kernel after reboot is the patched version.
  • Review vendor advisories for affected and fixed version mapping.
  • Monitor affected systems for unusual memory pressure until patched.
Prepared
Confidence
medium
Sources
6

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-2021-47426 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
2ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

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.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1c8f9b91c456f5b47a377a0c8c5d4130fc39433a, 1c8f9b91c456f5b47a377a0c8c5d4130fc39433a, 1c8f9b91c456f5b47a377a0c8c5d4130fc39433a, 1c8f9b91c456f5b47a377a0c8c5d4130fc39433aunaffected
LinuxLinux5.4, 0, 5.4.153, 5.10.73, 5.14.12, 5.15affected
Weakness

CWE details

No CWE listed

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