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CVE Record

CVE-2024-35866: smb: client: fix potential UAF in cifs_dump_full_key()

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF in cifs_dump_full_key() Skip sessions that are being teared down (status == SES_EXITING) to avoid UAF.

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 SMB client memory-safety flaw. During SMB session teardown, kernel code could reference session data after it should no longer be used. The public sources do not provide CVSS, proven impact, or active exploitation evidence, so urgency depends on SMB client use and kernel patch status.

Executive priority

Handle through normal kernel patch management, with higher priority for systems that mount SMB shares or depend on SMB file access. Because public severity and exploitation evidence are incomplete, avoid emergency assumptions, but do not leave exposed kernels untracked.

Technical view

CVE-2024-35866 fixes a potential use-after-free in cifs_dump_full_key() by skipping SMB client sessions with status SES_EXITING. The issue is in the Linux kernel SMB/CIFS client path. The bundle lists affected kernel lines including 5.13 through fixed stable versions, with multiple upstream stable commits resolving it.

Likely exposure

Linux systems running affected kernels with SMB/CIFS client functionality are the likely exposure area, especially hosts that mount SMB shares. Exposure depends on kernel build, distribution backports, and whether the SMB client path is used. The sources do not identify affected applications beyond Linux kernel SMB client code.

Exploitation context

No active exploitation is cited in the supplied sources, and the CVE is not marked KEV. The bundle describes a potential use-after-free but does not provide exploitability detail, attacker prerequisites, or observed attacks. Treat exploit status as unconfirmed unless vendor or threat-intelligence sources add evidence.

Researcher notes

The key technical signal is a race around SMB session teardown: sessions in SES_EXITING are now skipped to avoid use-after-free. Public data does not establish privilege boundary, crashability, or remote trigger conditions. Validate against exact kernel source or vendor backport status before scoring exposure.

Mitigation direction

  • Apply the relevant Linux stable kernel update or distribution backport.
  • Review Debian LTS guidance if running affected Debian kernel packages.
  • Prioritize systems using SMB/CIFS client mounts or file-share integrations.
  • Check vendor advisories for fixed package versions and reboot requirements.

Validation and detection

  • Inventory Linux kernel versions across servers, workstations, appliances, and containers with host kernel exposure.
  • Identify systems using SMB/CIFS client mounts or related kernel modules.
  • Confirm installed kernel packages include the referenced stable fix or vendor backport.
  • Verify Debian hosts against the Debian LTS advisory package guidance.
  • Document exceptions where SMB/CIFS client functionality is disabled or unused.
Prepared
Confidence
medium
Sources
8

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-2024-35866 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
7Source 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
LinuxLinux1bb56810677f26b78d57a3038054943efd334a1c, 1bb56810677f26b78d57a3038054943efd334a1c, 1bb56810677f26b78d57a3038054943efd334a1c, 1bb56810677f26b78d57a3038054943efd334a1c, 1bb56810677f26b78d57a3038054943efd334a1cunaffected
LinuxLinux5.13, 0, 5.15.181, 6.1.132, 6.6.26, 6.8.5, 6.9affected
Weakness

CWE details

No CWE listed

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