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CVE Record

CVE-2022-49497: net: remove two BUG() from skb_checksum_help()

In the Linux kernel, the following vulnerability has been resolved: net: remove two BUG() from skb_checksum_help() I have a syzbot report that managed to get a crash in skb_checksum_help() If syzbot can trigger these BUG(), it makes sense to replace them with more friendly WARN_ON_ONCE() since skb_checksum_help() can instead return an error code. Note that syzbot will still crash there, until real bug is fixed.

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue can turn a malformed local networking condition into a kernel crash, causing denial of service. It does not indicate data theft or privilege escalation in the provided sources. The main business risk is availability on systems where lower-privileged local users can exercise the vulnerable path.

Executive priority

Medium priority. Patch through the normal kernel maintenance process, with accelerated handling for systems where local users are not fully trusted or downtime would materially affect operations.

Technical view

CVE-2022-49497 concerns BUG() calls in skb_checksum_help(). A syzbot report showed these paths could be triggered and crash the kernel. The fix replaces the BUG() crashes with WARN_ON_ONCE() behavior and error handling. CVSS indicates local access, low complexity, low privileges, no user interaction, and high availability impact.

Likely exposure

Exposure is limited to affected Linux kernel versions listed by the CVE data. Systems with untrusted local users or local code execution paths have the clearest risk. The provided sources do not establish remote exploitability or affected downstream distributions.

Exploitation context

The source bundle cites syzbot-triggered crashes, not public exploitation. KEV status is false, and no cited source claims active exploitation. Treat this as a local denial-of-service risk until vendor-specific evidence says otherwise.

Researcher notes

The record’s affected-version data is broad and partially commit-based, so downstream distribution status needs vendor confirmation. The description notes syzbot may still crash until the underlying bug is fixed, making backport verification important.

Mitigation direction

  • Update affected Linux kernels using vendor-supported packages or stable kernel fixes.
  • Check vendor advisories for backported fixes before relying on version strings alone.
  • Prioritize shared, multi-user, and availability-critical Linux systems.
  • Limit local shell or workload access to trusted users where patching is delayed.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and images.
  • Confirm whether vendor kernels include the referenced stable commits or equivalent backports.
  • Review kernel logs for crashes or warnings around skb_checksum_help().
  • Verify monitoring detects unexpected reboots or kernel panic events.
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-2022-49497 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-2022-49497Attack 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
LinuxLinuxa030847e9f0eed2a080f6114381c649a7aa43d25, a030847e9f0eed2a080f6114381c649a7aa43d25, a030847e9f0eed2a080f6114381c649a7aa43d25, a030847e9f0eed2a080f6114381c649a7aa43d25, a030847e9f0eed2a080f6114381c649a7aa43d25unaffected
LinuxLinux2.6.24, 0, 5.10.121, 5.15.46, 5.17.14, 5.18.3, 5.19affected
Weakness

CWE details

No CWE listed

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