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CVE Record

CVE-2022-49641: sysctl: Fix data races in proc_douintvec().

In the Linux kernel, the following vulnerability has been resolved: sysctl: Fix data races in proc_douintvec(). A sysctl variable is accessed concurrently, and there is always a chance of data-race. So, all readers and writers need some basic protection to avoid load/store-tearing. This patch changes proc_douintvec() to use READ_ONCE() and WRITE_ONCE() internally to fix data-races on the sysctl side. For now, proc_douintvec() itself is tolerant to a data-race, but we still need to add annotations on the other subsystem's side.

MediumCVSS 4.7Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-49641 is a Linux kernel data-race issue in sysctl handling. A local, low-privileged user could potentially trigger an availability impact under difficult conditions. There is no source-provided evidence of active exploitation or remote attack exposure.

Executive priority

Treat as routine-to-moderate Linux kernel maintenance. Prioritize environments with local untrusted users or dense shared workloads. It does not currently justify emergency action absent vendor escalation or exploitation evidence.

Technical view

The issue is a CWE-362 race in proc_douintvec(), where concurrent sysctl variable access lacked READ_ONCE()/WRITE_ONCE() protection, risking load/store tearing. CVSS 3.1 is 4.7: local attack vector, high complexity, low privileges, no user interaction, availability impact only.

Likely exposure

Exposure is limited to systems running affected Linux kernel versions or downstream builds containing the vulnerable sysctl code. Network-only attackers are not indicated by the CVSS vector. Confirm exposure through kernel version, vendor backport status, and referenced stable commits.

Exploitation context

The provided sources do not report public exploitation or CISA KEV listing. Exploitation requires local access, low privileges, and high-complexity timing conditions. Impact is modeled as availability loss, not confidentiality or integrity compromise.

Researcher notes

The record describes a resolved kernel race, not a detailed exploit path. The affected-version data in the supplied bundle is limited and should be reconciled with distro advisories because vendors often backport kernel fixes without changing major version numbers.

Mitigation direction

  • Check your Linux distribution’s advisory for CVE-2022-49641.
  • Update to a vendor kernel containing the referenced stable fixes.
  • Prioritize shared multi-user systems and container hosts for review.
  • If updates are delayed, monitor for unexplained kernel instability.

Validation and detection

  • Inventory Linux kernel versions across servers and endpoints.
  • Compare installed kernels with vendor fixed versions or backport notes.
  • Review whether referenced stable commits are included in your kernel source package.
  • Confirm no affected custom kernels remain in production.
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-362: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2022-49641 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.7 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:H/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
3Timeline events
1ADP 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
4.7CVSS 3.1MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H13.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

4.7Medium
CVSS 3.1 vector shape for CVE-2022-49641Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxe7d316a02f683864a12389f8808570e37fb90aa3, e7d316a02f683864a12389f8808570e37fb90aa3, e7d316a02f683864a12389f8808570e37fb90aa3, e7d316a02f683864a12389f8808570e37fb90aa3, 70cd763eb1574cac07138be91f474a661e02d694, f4cea51e9a3d536e2ca2b74a958f7c0b4ea733c3unaffected
LinuxLinux4.8, 0, 5.10.132, 5.15.56, 5.18.13, 5.19affected
Weakness

CWE details

CWE-362

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

CWE-362 · source CWE mapping

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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