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CVE Record

CVE-2024-35880: io_uring/kbuf: hold io_buffer_list reference over mmap

In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: hold io_buffer_list reference over mmap If we look up the kbuf, ensure that it doesn't get unregistered until after we're done with it. Since we're inside mmap, we cannot safely use the io_uring lock. Rely on the fact that we can lookup the buffer list under RCU now and grab a reference to it, preventing it from being unregistered until we're done with it. The lookup returns the io_buffer_list directly with it referenced.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in Linux io_uring buffer handling could let a low-privileged local user trigger unsafe memory access during a buffer-backed mmap operation. Successful exploitation could compromise confidentiality, integrity, or availability. It is not remotely exploitable according to the supplied CVSS vector.

Executive priority

Prioritize remediation during the next urgent kernel maintenance cycle, accelerating systems with untrusted local users or sensitive workloads. This is a high-impact local privilege boundary risk, but the supplied evidence does not support emergency treatment based on active exploitation.

Technical view

The io_uring kbuf mmap path could use an io_buffer_list while another operation unregisters it. The fix performs the RCU lookup with a retained reference, preventing the list from being released before mmap finishes. The supplied CVSS 3.1 score is 7.8 with local access, low complexity, low privileges, and no user interaction.

Likely exposure

Exposure requires Linux systems running an affected kernel where an untrusted local account can exercise the vulnerable io_uring buffer-mapping path. The supplied version list identifies affected releases or boundaries including 6.6.26, 6.7, 6.8.5, and 6.9, but its flattened version data is ambiguous. Confirm distribution-specific package status.

Exploitation context

The supplied record does not identify CISA KEV listing, active exploitation, or a public proof of concept. Exploitation requires local access and low privileges. Treat the impact assessment as serious, but do not characterize this vulnerability as exploited in the wild without additional evidence.

Researcher notes

The core issue is lifetime management around io_buffer_list lookup during mmap: RCU lookup alone was insufficient without retaining a reference. The stable commits are authoritative fix references. Exact introduction and fixed-version ranges cannot be reconstructed confidently from the flattened version entries supplied, so downstream advisory mapping is essential.

Mitigation direction

  • Apply a vendor-supported kernel update containing the referenced io_uring kbuf fix.
  • Check distribution advisories because packaged kernel versions may not match upstream numbering.
  • Prioritize multi-user systems where untrusted local users can access io_uring.
  • If patching is delayed, consult vendor guidance for supported exposure-reduction options.

Validation and detection

  • Inventory running kernel versions, not only installed kernel packages.
  • Map each kernel package to its distribution advisory for CVE-2024-35880.
  • Confirm the running kernel includes the relevant stable fix or vendor backport.
  • Reboot after updating, then verify the active kernel version.
  • Review local account exposure and access to affected io_uring functionality.
Prepared
Confidence
medium
Sources
5

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-2024-35880 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/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
4Source links

SSVC decision data

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

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
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-35880Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux09f7520048eaaee9709091cd2787966f807da7c5, 5cf4f52e6d8aa2d3b7728f568abbf9d42a3af252, 5cf4f52e6d8aa2d3b7728f568abbf9d42a3af252, 6.6.5unaffected
LinuxLinux6.7, 0, 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.