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CVE Record

CVE-2022-49748: perf/x86/amd: fix potential integer overflow on shift of a int

In the Linux kernel, the following vulnerability has been resolved: perf/x86/amd: fix potential integer overflow on shift of a int The left shift of int 32 bit integer constant 1 is evaluated using 32 bit arithmetic and then passed as a 64 bit function argument. In the case where i is 32 or more this can lead to an overflow. Avoid this by shifting using the BIT_ULL macro instead.

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-49748 is a Linux kernel bug in AMD x86 perf handling. A local low-privileged user could potentially trigger a denial of service. The sourced CVSS score is medium, with availability impact only and no confidentiality or integrity impact stated.

Executive priority

Treat as a moderate operational availability risk. It is most urgent for shared Linux environments where local users or workloads are less trusted. Patch through normal kernel maintenance unless local denial-of-service risk is business-critical.

Technical view

The issue is an integer overflow from shifting a 32-bit int constant before passing it as a 64-bit argument. When the shift index is 32 or higher, overflow can occur. The kernel fix uses BIT_ULL for 64-bit-safe shifting in perf/x86/amd code.

Likely exposure

Exposure is local, not network-facing. Linux systems running affected kernel versions in the AMD x86 perf code path are the relevant population, especially multi-user hosts, shared compute, and systems allowing low-privileged local code execution.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation evidence. CVSS indicates local access, low complexity, low privileges, no user interaction, and high availability impact.

Researcher notes

The affected data lists Linux kernel versions and commit identifiers, but distribution backport status is not included. Validate impact against downstream vendor kernels rather than relying only on upstream version numbers.

Mitigation direction

  • Apply Linux kernel updates containing the referenced stable fixes.
  • Prioritize shared or multi-user Linux systems for remediation.
  • Check your Linux distribution advisories for backported kernel fixes.
  • Avoid assuming product impact beyond the Linux kernel data provided.

Validation and detection

  • Inventory Linux kernel versions across affected fleets.
  • Compare running kernels against vendor advisories and referenced stable commits.
  • Confirm whether systems use AMD x86 perf-related kernel code paths.
  • Track remediation through package version or kernel build evidence.
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.

ATT&CK lookup starting points

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cwe · low confidence lookup

CWE-190: Exact CWE lookup

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cve · low confidence lookup

CVE-2022-49748 mapping review

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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
3Timeline events
1ADP providers
6Source 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
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

5.5Medium
CVSS 3.1 vector shape for CVE-2022-49748Attack 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

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
LinuxLinuxd8a6a443ff0aea5893f0a7f2726973b496b76420, 471af006a747f1c535c8a8c6c0973c320fe01b22, 471af006a747f1c535c8a8c6c0973c320fe01b22, 471af006a747f1c535c8a8c6c0973c320fe01b22, 471af006a747f1c535c8a8c6c0973c320fe01b22, 3512462036dbe44d88e93e75ee8a993781183ddbunaffected
LinuxLinux5.6, 0, 5.4.231, 5.10.166, 5.15.91, 6.1.9, 6.2affected
Weakness

CWE details

CWE-190

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

CWE-190 · source CWE mapping

Integer Overflow or Wraparound

Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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