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CVE Record

CVE-2022-48641: netfilter: ebtables: fix memory leak when blob is malformed

In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: fix memory leak when blob is malformed The bug fix was incomplete, it "replaced" crash with a memory leak. The old code had an assignment to "ret" embedded into the conditional, restore this.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue is a memory leak in netfilter ebtables handling when a malformed rules blob is processed. The public record says an earlier bug fix avoided a crash but left a leak. The sources do not provide CVSS, attacker prerequisites, or evidence of exploitation.

Executive priority

Handle through normal kernel patch management unless vendor guidance raises severity for your environment. There is no cited active exploitation or CVSS score, but kernel memory leaks can affect availability on shared or high-trust infrastructure.

Technical view

CVE-2022-48641 concerns Linux kernel netfilter ebtables code. The resolved change restores an assignment to ret inside a conditional after an incomplete prior fix changed crash behavior into a memory leak on malformed blob input. Multiple stable kernel commit references are provided, but the bundle does not define exploitability details.

Likely exposure

Exposure is limited to Linux kernels containing the vulnerable ebtables/netfilter code path before the referenced stable fixes or equivalent vendor backports. The bundle lists Linux as the affected product but does not clarify distributions, configurations, privileges, or whether ebtables must be actively used.

Exploitation context

The source bundle does not cite active exploitation, and KEV is false. It also does not state whether the malformed blob can be supplied remotely or requires local administrative capabilities. Treat this as a kernel resource-exhaustion risk pending vendor-specific assessment.

Researcher notes

The record is sparse: no CVSS, CWE, exploit prerequisites, or configuration guidance are provided. Analysis should focus on the referenced netfilter ebtables stable commits and downstream vendor backports. Avoid assuming remote exploitability from the CVE text alone.

Mitigation direction

  • Check your Linux vendor advisory for CVE-2022-48641 coverage and backported fixes.
  • Update affected kernels to a release containing the referenced stable fix or vendor equivalent.
  • Prioritize systems that permit ebtables or netfilter rule management by untrusted operators.
  • Review kernel package changelogs rather than relying only on upstream version strings.

Validation and detection

  • Inventory Linux kernel versions and vendor package build numbers across servers and appliances.
  • Confirm whether vendor advisories map installed kernels to CVE-2022-48641 remediation.
  • Review whether ebtables/netfilter administration is exposed to containers, tenants, or delegated operators.
  • Check vulnerability scanner results against vendor backport status to avoid false positives.
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-2022-48641 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
3Timeline events
2ADP providers
8Source links

SSVC decision data

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

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

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxafd01382594d643e1adeb16826423b418cdf8b8b, 358765beb836f5fc2ed26b5df4140d5d3548ac11, 160c4eb47db03b96c0c425358e7595ebefe8094d, 624c30521233e110cf50ba01980a591e045036ae, 1b2c5428f773d60c116c7b1e390432e0cfb63cd6, e53cfa017bf4575d0b948a8f45313ef66d897136, 7997eff82828304b780dc0a39707e1946d6f1ebfunaffected
LinuxLinux4.14.292, 4.19.257, 5.4.212, 5.10.140, 5.15.64, 5.19.6unaffected
Weakness

CWE details

No CWE listed

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