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CVE Record

CVE-2024-35862: smb: client: fix potential UAF in smb2_is_network_name_deleted()

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF in smb2_is_network_name_deleted() Skip sessions that are being teared down (status == SES_EXITING) to avoid UAF.

CriticalCVSS 9.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

A flaw in Linux’s SMB client can access a session after it has begun shutting down, creating a use-after-free memory-safety risk. The supplied CVSS score is 9.8, indicating potentially severe confidentiality, integrity, and availability impact, but the sources do not document a demonstrated attack outcome.

Executive priority

Treat as an urgent patching and exposure-verification issue for SMB-using Linux systems. Critical scoring warrants prompt action, but the absence of documented exploitation means priority should remain risk-based rather than emergency incident response unless local evidence suggests abuse.

Technical view

smb2_is_network_name_deleted() could examine a session being torn down, potentially using freed memory. The kernel fix skips sessions whose status is SES_EXITING. The supplied sources identify the flaw and corrective commits but do not establish exploitability details or reliable fixed-version boundaries across distributions.

Likely exposure

Exposure applies to Linux systems using the kernel SMB client, especially those connecting to SMB shares. The bundle lists 5.12, 6.1.85, 6.6.26, 6.8.5, and 6.9 as affected, plus an ambiguous “0” entry. Distribution backports may change actual status.

Exploitation context

The bundle marks this CVE as absent from CISA KEV and provides no evidence of active exploitation or a public exploit. Although the supplied CVSS vector rates it network-accessible without privileges or user interaction, the sources do not explain the conditions needed to trigger the teardown race.

Researcher notes

The narrow documented defect is session-lifetime handling: SES_EXITING sessions must be ignored to prevent a potential use-after-free. The source bundle does not provide trigger mechanics, crash signatures, proof of code execution, affected distribution packages, or complete version-range semantics. Avoid extending conclusions beyond the SMB client teardown path.

Mitigation direction

  • Apply a supported vendor kernel update containing the referenced SMB client fix.
  • Prioritize systems that mount or regularly access SMB shares.
  • Check distribution advisories because patched kernels may retain older version numbers.
  • If patching is delayed, reduce unnecessary SMB client connectivity and monitor vendor guidance.

Validation and detection

  • Inventory kernel versions on systems using SMB client functionality.
  • Identify active and configured SMB mounts, including automated mounts.
  • Confirm vendor packages backport one of the referenced corrective commits.
  • After updating, verify the patched kernel is running following any required reboot.
Prepared
Confidence
high
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-2024-35862 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
Critical
CVSS
9.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
5Source 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
9.8CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

9.8Critical
CVSS 3.1 vector shape for CVE-2024-35862Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux9e550b085206544bd03a8b1dd58a5414e9508351, 9e550b085206544bd03a8b1dd58a5414e9508351, 9e550b085206544bd03a8b1dd58a5414e9508351, 9e550b085206544bd03a8b1dd58a5414e9508351unaffected
LinuxLinux5.12, 0, 6.1.85, 6.6.26, 6.8.5, 6.9affected
Weakness

CWE details

No CWE listed

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