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CVE Record

CVE-2024-56688: sunrpc: clear XPRT_SOCK_UPD_TIMEOUT when reset transport

In the Linux kernel, the following vulnerability has been resolved: sunrpc: clear XPRT_SOCK_UPD_TIMEOUT when reset transport Since transport->sock has been set to NULL during reset transport, XPRT_SOCK_UPD_TIMEOUT also needs to be cleared. Otherwise, the xs_tcp_set_socket_timeouts() may be triggered in xs_tcp_send_request() to dereference the transport->sock that has been set to NULL.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux kernel SUNRPC transport-reset flaw can cause the kernel to access a socket after it has been cleared. A successful trigger could crash or disrupt an affected system, creating a denial of service. The supplied CVSS 3.1 score is 7.5, with availability impact only.

Executive priority

Schedule prompt remediation for affected, availability-critical Linux systems. The primary business risk is service interruption rather than data theft or modification. Raise urgency where SUNRPC is network-reachable, but do not describe this as actively exploited based on the supplied evidence.

Technical view

During transport reset, transport->sock becomes NULL, but XPRT_SOCK_UPD_TIMEOUT was not cleared. A later request can invoke xs_tcp_set_socket_timeouts() from xs_tcp_send_request() and dereference the NULL socket. This is CWE-476. The referenced stable-kernel fixes clear the stale timeout-update state.

Likely exposure

Exposure requires a Linux kernel build identified as affected and use of the relevant SUNRPC TCP reset-and-send path. The bundle lists affected releases from 4.11 through several later stable-series versions, including 6.12.2 and 6.13. Confirm exact exposure against the deployed distribution's build and backport status.

Exploitation context

The CVSS vector rates the issue network-accessible, low complexity, unauthenticated, and requiring no user interaction. However, the source bundle provides no proof of practical exploitation or public weaponization, and the CVE is not listed as KEV. Treat remote triggerability as a scoring assessment, not confirmed active exploitation.

Researcher notes

The vulnerable state transition leaves XPRT_SOCK_UPD_TIMEOUT set after transport->sock is nulled. The supplied record identifies eight stable-kernel fix commits. Version data contains duplicated commit identifiers and an ambiguous entry of "0," so build-level vendor verification is more reliable than interpreting the raw version list alone.

Mitigation direction

  • Install the vendor or distribution kernel update containing the applicable stable-kernel fix.
  • Review the referenced Debian advisories when operating affected Debian LTS systems.
  • Prioritize internet-facing or availability-critical systems using the relevant SUNRPC TCP functionality.
  • If updates are delayed, consult vendor guidance for supported temporary risk-reduction measures.

Validation and detection

  • Record each system's running kernel version and distribution build identifier.
  • Compare builds with vendor advisories, including backport status rather than version numbers alone.
  • Confirm the applicable fix commit or vendor-equivalent patch is present.
  • Review kernel logs for NULL-pointer faults involving xs_tcp_send_request or xs_tcp_set_socket_timeouts.
  • Regression-test SUNRPC transport reset and request handling after updating.
Prepared
Confidence
high
Sources
12

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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cwe · low confidence lookup

CWE-476: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2024-56688 mapping review

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

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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.

2CVSS vectors
3Timeline events
2ADP providers
11Source links

SSVC decision data

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

CVSS vector scores

2 official scores

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
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2024-56688Attack 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
cvssV3_1other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux7196dbb02ea05835b9ee56910ee82cb55422c7f1, 7196dbb02ea05835b9ee56910ee82cb55422c7f1, 7196dbb02ea05835b9ee56910ee82cb55422c7f1, 7196dbb02ea05835b9ee56910ee82cb55422c7f1, 7196dbb02ea05835b9ee56910ee82cb55422c7f1, 7196dbb02ea05835b9ee56910ee82cb55422c7f1, 7196dbb02ea05835b9ee56910ee82cb55422c7f1, 7196dbb02ea05835b9ee56910ee82cb55422c7f1unaffected
LinuxLinux4.11, 0, 5.4.287, 5.10.231, 5.15.174, 6.1.120, 6.6.64, 6.11.11, 6.12.2, 6.13affected
Weakness

CWE details

CWE-476

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

CWE-476 · source CWE mapping

NULL Pointer Dereference

NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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