LiveActive security incident?Get immediate response
CVE Record

CVE-2021-47002: SUNRPC: Fix null pointer dereference in svc_rqst_free()

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Fix null pointer dereference in svc_rqst_free() When alloc_pages_node() returns null in svc_rqst_alloc(), the null rq_scratch_page pointer will be dereferenced when calling put_page() in svc_rqst_free(). Fix it by adding a null check. Addresses-Coverity: ("Dereference after null check")

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

Security readout for executives and security teams

Plain-English summary

CVE-2021-47002 is a Linux kernel reliability flaw in SUNRPC. Under a failed memory allocation, cleanup code could dereference a null pointer and crash kernel handling. The provided sources do not give CVSS, exploitation evidence, or business-impact specifics beyond the kernel fix.

Executive priority

Track this as a patch-management item until vendor impact is confirmed. With no CVSS or exploitation evidence in the bundle, urgency is unclear, but kernel crash risk still matters for availability-sensitive systems.

Technical view

The issue is in svc_rqst_alloc()/svc_rqst_free(). If alloc_pages_node() returns null, rq_scratch_page remains null and svc_rqst_free() can pass it to put_page(). The upstream resolution adds a null check. The bundle lists Linux kernel versions and stable commits, but not distro package mappings.

Likely exposure

Exposure is limited to systems running affected Linux kernel builds identified by the source bundle. SUNRPC-relevant systems deserve review first, but the bundle does not prove a remote trigger, name affected distributions, or specify exact Siemens product exposure.

Exploitation context

The CVE is not marked KEV, and the provided sources do not state active exploitation or provide exploit maturity. The evidence describes a Coverity-detected null pointer dereference fixed in upstream stable commits.

Researcher notes

The available record is narrow: root cause and fix are clear, but triggerability, privilege boundary, reachable attack surface, and distro impact are not established in the provided evidence. Avoid overstating exploitability without vendor or kernel maintainer detail.

Mitigation direction

  • Upgrade to a kernel containing the referenced stable fixes.
  • Check Linux distribution advisories for backported fixed kernel packages.
  • Review Siemens SSA-265688 if operating Siemens-managed affected environments.
  • If patching is delayed, follow vendor guidance for temporary mitigations.

Validation and detection

  • Inventory Linux kernel versions across servers and appliances.
  • Map running kernels to vendor-fixed package versions or referenced commits.
  • Identify systems using SUNRPC-related kernel services for prioritization.
  • Confirm patched systems no longer run affected kernel builds.
Prepared
Confidence
medium
Sources
7

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-2021-47002 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
3ADP providers
6Source 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
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux79e4e0d489c8e72b9efa388e504a036eec1550c6, 5191955d6fc65e6d4efe8f4f10a6028298f57281, 5191955d6fc65e6d4efe8f4f10a6028298f57281, 5191955d6fc65e6d4efe8f4f10a6028298f57281unaffected
LinuxLinux5.11, 0, 5.10.221, 5.11.22, 5.12.5, 5.13affected
Weakness

CWE details

No CWE listed

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