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CVE Record

CVE-2025-22004: net: atm: fix use after free in lec_send()

In the Linux kernel, the following vulnerability has been resolved: net: atm: fix use after free in lec_send() The ->send() operation frees skb so save the length before calling ->send() to avoid a use after free.

HighCVSS 8.6Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in the Linux kernel’s ATM LAN Emulation networking code can access packet memory after it has been freed. This may crash or disrupt affected systems and could affect limited data confidentiality or integrity. Risk depends on whether the vulnerable ATM functionality is present and exercised.

Executive priority

Treat this as a high-priority patch-management issue, not a confirmed emergency. Promptly identify systems using the affected ATM path, then apply supported kernel updates. Accelerate remediation where vulnerable functionality supports critical availability; use normal expedited maintenance for systems where exposure remains uncertain.

Technical view

In lec_send(), the downstream send operation frees the socket buffer, but the function subsequently uses its length, causing a CWE-416 use-after-free. The upstream correction stores the length before calling send. The supplied CVSS 3.1 score is 8.6, with network reachability, low complexity, no privileges, and no user interaction.

Likely exposure

Potential exposure is limited to Linux systems containing the affected kernel code and using the ATM LAN Emulation send path. The bundle lists multiple affected kernel lines, but its flattened version data does not clearly preserve exact affected and fixed boundaries. Confirm status through distribution advisories and fix backports.

Exploitation context

The bundle provides no evidence of public or active exploitation, and the CVE is not identified as CISA KEV. The CVSS vector describes network reachability and high availability impact, but practical exploitability depends on reaching the relevant ATM LAN Emulation path. Absence from KEV does not prove exploitation is impossible.

Researcher notes

The authoritative description establishes a post-send socket-buffer use-after-free and a minimal lifetime fix. The source bundle does not establish attacker-controlled code execution, a public proof of concept, active exploitation, or precise configuration prerequisites. Its version representation is ambiguous, so commit ancestry and distribution backport status are stronger validation signals than version strings alone.

Mitigation direction

  • Update to a vendor-supported kernel containing the applicable upstream fix or distribution backport.
  • Review Linux distribution advisories to identify the corrected package for each deployed kernel line.
  • Prioritize confirmed ATM LAN Emulation users and systems supporting business-critical services.
  • If immediate updating is impossible, consult vendor guidance for supported feature-reduction measures.

Validation and detection

  • Inventory running kernel versions and distribution package revisions across Linux systems.
  • Determine whether ATM LAN Emulation functionality is present and used on each candidate system.
  • Verify the installed kernel includes the applicable listed fix commit or vendor backport.
  • After updating, confirm systems boot successfully and report the expected corrected kernel package.
Prepared
Confidence
medium
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-416: 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.

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cve · low confidence lookup

CVE-2025-22004 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.6 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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.

2CVSS vectors
3Timeline events
2ADP providers
11Source links

SSVC decision data

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

CVSS vector scores

2 official scores

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
8.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H3.94.7Linux
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

8.6High
CVSS 3.1 vector shape for CVE-2025-22004Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2unaffected
LinuxLinux2.6.12, 0, 5.4.292, 5.10.236, 5.15.180, 6.1.132, 6.6.85, 6.12.21, 6.13.9, 6.14affected
Weakness

CWE details

CWE-416

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

CWE-416 · source CWE mapping

Use After Free

Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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