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CVE Record

CVE-2024-26980: ksmbd: fix slab-out-of-bounds in smb2_allocate_rsp_buf

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slab-out-of-bounds in smb2_allocate_rsp_buf If ->ProtocolId is SMB2_TRANSFORM_PROTO_NUM, smb2 request size validation could be skipped. if request size is smaller than sizeof(struct smb2_query_info_req), slab-out-of-bounds read can happen in smb2_allocate_rsp_buf(). This patch allocate response buffer after decrypting transform request. smb3_decrypt_req() will validate transform request size and avoid slab-out-of-bound in smb2_allocate_rsp_buf().

HighCVSS 8.2Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A malformed, unauthenticated network request to Linux's ksmbd SMB server can trigger an out-of-bounds kernel memory read. The documented impact includes limited information exposure and potentially serious service or system disruption. Risk is concentrated on systems running ksmbd and exposing SMB to untrusted networks.

Executive priority

Prioritize exposed ksmbd servers for prompt assessment and patching because malformed unauthenticated traffic may disrupt availability. Internet-facing or broadly reachable SMB services deserve accelerated handling. Systems not using ksmbd have materially lower direct exposure, but asset and configuration verification is still required.

Technical view

SMB2 transform requests could bypass request-size validation before smb2_allocate_rsp_buf() accessed the request as a larger structure, causing a slab out-of-bounds read. The kernel fix moves response-buffer allocation until after smb3_decrypt_req() validates the transformed request. CVSS 3.1 is 8.2: network-accessible, low complexity, unauthenticated, with low confidentiality and high availability impact.

Likely exposure

Likely exposure is limited to Linux systems using the in-kernel ksmbd server, especially where SMB is network-reachable. The bundle identifies affected 5.15 and later kernel branches with several version boundaries, but its version data is insufficient to determine every distribution-specific affected package reliably.

Exploitation context

The supplied record describes remote, unauthenticated exploitation conditions with no user interaction. It does not establish code execution. CISA KEV status is false, and the supplied sources provide no evidence of active exploitation; absence from KEV does not prove exploitation has never occurred.

Researcher notes

The vulnerable ordering permits size validation to be skipped for SMB2 transform protocol requests. The correction validates and decrypts the transform request before response allocation. The bundle provides multiple stable-tree commits, suggesting branch-specific backports; confirm ancestry or distribution package status instead of relying solely on displayed version numbers.

Mitigation direction

  • Install a vendor-supported kernel containing the applicable upstream stable fix.
  • Follow distribution advisories to map fixed kernels to packaged version numbers.
  • Disable ksmbd where kernel-hosted SMB service is unnecessary.
  • Restrict SMB access to trusted networks until updates are confirmed.

Validation and detection

  • Inventory Linux kernel and distribution package versions across SMB-serving hosts.
  • Confirm whether ksmbd is enabled, loaded, or configured to start.
  • Identify whether SMB ports are reachable from untrusted networks.
  • Verify the installed kernel includes the applicable referenced stable fix.
  • Review kernel logs for unexplained ksmbd faults or memory-access failures.
Prepared
Confidence
medium
Sources
7

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.

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CVE-2024-26980 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.2 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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
9Source 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
8.2CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H3.94.2Linux
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

8.2High
CVSS 3.1 vector shape for CVE-2024-26980Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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
LinuxLinux0626e6641f6b467447c81dd7678a69c66f7746cf, 0626e6641f6b467447c81dd7678a69c66f7746cf, 0626e6641f6b467447c81dd7678a69c66f7746cf, 0626e6641f6b467447c81dd7678a69c66f7746cf, 0626e6641f6b467447c81dd7678a69c66f7746cfunaffected
LinuxLinux5.15, 0, 5.15.159, 6.1.88, 6.6.29, 6.8.8, 6.9affected
Weakness

CWE details

No CWE listed

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