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CVE Record

CVE-2024-46713: perf/aux: Fix AUX buffer serialization

In the Linux kernel, the following vulnerability has been resolved: perf/aux: Fix AUX buffer serialization Ole reported that event->mmap_mutex is strictly insufficient to serialize the AUX buffer, add a per RB mutex to fully serialize it. Note that in the lock order comment the perf_event::mmap_mutex order was already wrong, that is, it nesting under mmap_lock is not new with this patch.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux kernel locking flaw can allow a local, low-privileged user to trigger unsafe concurrent handling of performance-monitoring AUX buffers. The supplied CVSS assessment indicates potentially serious confidentiality, integrity, and availability impact. Exploitation requires local access; this is not described as a remotely reachable flaw.

Executive priority

Treat this as a high-priority kernel maintenance issue, especially on shared Linux hosts. It is locally exploitable rather than remotely exposed, but the assessed impact is broad. Expedite supported updates where untrusted users or workloads have local access, then address remaining affected systems through the normal emergency-patching process.

Technical view

The existing perf event mmap mutex did not fully serialize AUX buffer operations. The kernel fix adds a mutex per ring buffer to prevent unsafe concurrency. The supplied CVSS v3.1 score is 7.8 with local access, low complexity, low privileges, no user interaction, and potentially high confidentiality, integrity, and availability impact.

Likely exposure

Exposure is limited to Linux systems running an affected kernel where a low-privileged local user can reach the vulnerable perf AUX-buffer behavior. Multi-user systems and hosts running untrusted workloads deserve priority. The supplied version data is ambiguous, so determine exposure using distribution advisories and whether the applicable stable fix is incorporated.

Exploitation context

The supplied sources do not establish active exploitation, and the CVE is not identified as being in KEV. The CVSS vector describes local, low-privileged exploitation with low attack complexity and no user interaction. No public exploit evidence is included in the source bundle.

Researcher notes

The defect concerns incomplete synchronization rather than an explicitly documented memory-safety primitive: event->mmap_mutex was insufficient to serialize AUX buffers. The remediation introduces per-ring-buffer locking. The bundle does not provide a CWE, demonstrated trigger, proof of concept, or confirmed exploitation, and its affected-version representation requires vendor-specific interpretation.

Mitigation direction

  • Install a distribution-supported kernel update incorporating the applicable upstream stable fix.
  • Review the cited Debian advisories when managing affected Debian releases.
  • Reboot systems into the updated kernel after installation.
  • Prioritize multi-user and untrusted-workload hosts while completing broader kernel maintenance.

Validation and detection

  • Inventory running kernel versions across Linux systems.
  • Compare each kernel package against vendor advisories and the cited stable fixes.
  • Confirm the updated kernel is active after reboot.
  • Recheck vulnerable hosts after patching to detect incomplete rollouts or rollback.
Prepared
Confidence
medium
Sources
10

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-2024-46713 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
9Source 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
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-2024-46713Attack 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
LinuxLinux45bfb2e50471abbbfd83d40d28c986078b0d24ff, 45bfb2e50471abbbfd83d40d28c986078b0d24ff, 45bfb2e50471abbbfd83d40d28c986078b0d24ff, 45bfb2e50471abbbfd83d40d28c986078b0d24ff, 45bfb2e50471abbbfd83d40d28c986078b0d24ff, 45bfb2e50471abbbfd83d40d28c986078b0d24ffunaffected
LinuxLinux4.1, 0, 5.10.226, 5.15.167, 6.1.110, 6.6.51, 6.10.10, 6.11affected
Weakness

CWE details

No CWE listed

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