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CVE Record

CVE-2023-52442: ksmbd: validate session id and tree id in compound request

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate session id and tree id in compound request `smb2_get_msg()` in smb2_get_ksmbd_tcon() and smb2_check_user_session() will always return the first request smb2 header in a compound request. if `SMB2_TREE_CONNECT_HE` is the first command in compound request, will return 0, i.e. The tree id check is skipped. This patch use ksmbd_req_buf_next() to get current command in compound.

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue affects ksmbd, the in-kernel SMB server. A crafted compound SMB2 request could bypass session or tree checks and cause a high availability impact. The supplied scoring requires local access with low privileges, and no active exploitation evidence is provided.

Executive priority

Treat as a moderate operational risk. It is not presented as remotely exploited or KEV-listed, but ksmbd-backed file services should be patched on normal maintenance timelines, sooner for critical file-sharing infrastructure.

Technical view

ksmbd used smb2_get_msg() in paths validating tree connections and user sessions, which returned the first SMB2 header in a compound request. When TREE_CONNECT was first, later command validation could be skipped. The fix uses ksmbd_req_buf_next() to validate the current command.

Likely exposure

Exposure is most likely on Linux systems running affected kernels with ksmbd enabled. Downstream distribution impact depends on vendor backports, so kernel package version alone may not prove vulnerability.

Exploitation context

The CVSS vector is local, low-complexity, low-privilege, no user interaction, with high availability impact. The bundle marks CISA KEV as false and provides no cited evidence of active exploitation.

Researcher notes

Evidence is limited to the CVE description, CVSS vector, affected Linux entries, and kernel stable commits. The exact crash path and downstream fixed package versions are not included in the supplied bundle.

Mitigation direction

  • Apply Linux kernel updates containing the referenced stable ksmbd fixes.
  • Check distribution advisories for backported fixed kernel package versions.
  • Prioritize systems where ksmbd is enabled or SMB service availability is critical.
  • If patching is delayed, follow vendor ksmbd hardening or workaround guidance.

Validation and detection

  • Inventory systems running kernels in the affected ranges from the CVE record.
  • Confirm whether ksmbd is enabled on each potentially affected host.
  • Verify installed kernel packages include the referenced stable fixes or vendor backports.
  • Review monitoring for kernel crashes or SMB service availability anomalies.
Prepared
Confidence
medium
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-2023-52442 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
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/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
0Timeline events
0ADP providers
5Source links

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
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2023-52442Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux0626e6641f6b467447c81dd7678a69c66f7746cf, 0626e6641f6b467447c81dd7678a69c66f7746cf, 0626e6641f6b467447c81dd7678a69c66f7746cf, 0626e6641f6b467447c81dd7678a69c66f7746cfunaffected
LinuxLinux5.15, 0, 5.15.145, 6.1.53, 6.4.16, 6.5affected
Weakness

CWE details

No CWE listed

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