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CVE Record

CVE-2024-35882: SUNRPC: Fix a slow server-side memory leak with RPC-over-TCP

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Fix a slow server-side memory leak with RPC-over-TCP Jan Schunk reports that his small NFS servers suffer from memory exhaustion after just a few days. A bisect shows that commit e18e157bb5c8 ("SUNRPC: Send RPC message on TCP with a single sock_sendmsg() call") is the first bad commit. That commit assumed that sock_sendmsg() releases all the pages in the underlying bio_vec array, but the reality is that it doesn't. svc_xprt_release() releases the rqst's response pages, but the record marker page fragment isn't one of those, so it is never released. This is a narrow fix that can be applied to stable kernels. A more extensive fix is in the works.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Affected Linux NFS servers using RPC over TCP can slowly lose memory because the kernel fails to release a page fragment after sending responses. Memory may become exhausted after days, disrupting service. The issue affects availability, not data confidentiality or integrity.

Executive priority

Prioritize remediation for exposed or critical NFS servers because prolonged operation can exhaust memory and interrupt service. Treat internal, monitored systems as scheduled high-priority patching rather than an emergency, absent evidence of active exploitation.

Technical view

A regression introduced by Linux commit e18e157bb5c8 incorrectly assumed sock_sendmsg() released every page in a bio_vec. svc_xprt_release() frees response pages but not the RPC record-marker fragment, causing a gradual server-side leak. The cited stable-kernel commits implement a narrow correction.

Likely exposure

Exposure is concentrated on Linux systems running affected kernel versions and serving SUNRPC workloads, especially NFS over TCP. The supplied affected-version data includes 6.6, 6.6.26, 6.8.5, and 6.9, but its range representation is ambiguous; verify distribution-specific kernel status.

Exploitation context

The CVSS 3.1 assessment is 7.5: network-accessible, low complexity, no privileges or user interaction, with high availability impact. The record is not in KEV, and the supplied sources provide no evidence of active exploitation or a public exploit.

Researcher notes

The failure is a reference-release mismatch involving the RPC-over-TCP record-marker page fragment. The report attributes the regression to e18e157bb5c8 and describes the published change as a narrow stable-kernel fix. Exact affected ranges cannot be reconstructed confidently from the supplied normalized version list.

Mitigation direction

  • Update to a vendor-supported kernel containing the applicable cited stable fix.
  • Check distribution advisories because packaged kernel versions may not map directly to upstream numbering.
  • Prioritize internet-reachable or business-critical NFS servers using RPC over TCP.
  • Monitor memory until patched and restart affected services or systems if operationally necessary.

Validation and detection

  • Inventory kernel versions on systems providing NFS or other SUNRPC services over TCP.
  • Compare kernel builds against vendor advisories and the cited upstream stable commits.
  • Review memory trends and exhaustion events on relevant servers.
  • Confirm memory remains stable under representative RPC-over-TCP workloads after updating.
Prepared
Confidence
medium
Sources
5

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

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CVE-2024-35882 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

1CVSS vectors
3Timeline events
2ADP providers
4Source links

SSVC decision data

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

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2024-35882Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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
LinuxLinuxe18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4, e18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4, e18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4unaffected
LinuxLinux6.6, 0, 6.6.26, 6.8.5, 6.9affected
Weakness

CWE details

No CWE listed

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