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CVE Record

CVE-2025-68724: crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id

In the Linux kernel, the following vulnerability has been resolved: crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id Use check_add_overflow() to guard against potential integer overflows when adding the binary blob lengths and the size of an asymmetric_key_id structure and return ERR_PTR(-EOVERFLOW) accordingly. This prevents a possible buffer overflow when copying data from potentially malicious X.509 certificate fields that can be arbitrarily large, such as ASN.1 INTEGER serial numbers, issuer names, etc.

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 flaw can turn unusually large, potentially malicious X.509 certificate fields into an integer overflow, which may then lead to a buffer overflow. The public record does not provide a severity score, confirmed impact, or active exploitation evidence.

Executive priority

Patch through the normal kernel update program, with acceleration for systems processing untrusted certificates or covered by Siemens guidance. Current business urgency is constrained by missing severity and no active exploitation evidence.

Technical view

The issue is in asymmetric_key_generate_id. The fix adds check_add_overflow() when combining binary blob lengths and asymmetric_key_id size, returning -EOVERFLOW on overflow. Inputs named in the record include large ASN.1 INTEGER serial numbers and issuer names from X.509 certificates.

Likely exposure

Systems running affected Linux kernel versions or vendor products incorporating those kernels may be exposed. Highest concern is for systems that import, validate, or otherwise process untrusted X.509 certificate material. Siemens has a related advisory, but product-specific exposure is not detailed in the supplied bundle.

Exploitation context

The bundle describes malicious certificate fields as the input vector, but gives no exploit chain, no proof of exploitation, and no CISA KEV listing. Treat exploitability and impact as incomplete until vendor advisories add severity and product context.

Researcher notes

Focus analysis on integer overflow handling around asymmetric_key_generate_id and oversized X.509 field parsing. The CVE record identifies the defensive change, but does not establish reachable attack surfaces, privileges required, crash versus code execution impact, or affected downstream product matrices.

Mitigation direction

  • Apply Linux or distribution kernel updates containing the referenced stable fixes.
  • Check Siemens SSA-019113 for product-specific remediation guidance.
  • Prioritize internet-facing or certificate-processing systems for earlier patching.
  • Limit ingestion of untrusted X.509 material where operationally feasible.
  • Monitor vendor advisories for CVSS, impact, and affected product updates.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and embedded products.
  • Confirm whether deployed kernels include the listed stable commits.
  • Review systems that process external X.509 certificates or certificate chains.
  • Check Siemens advisory applicability for any Siemens-managed assets.
  • Track whether vendors publish severity, exploitability, or backport details.
Prepared
Confidence
medium
Sources
11

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-2025-68724 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
10Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical 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

CISA-ADPCISA ADP Vulnrichment
other:ssvc
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux7901c1a8effbe5f89673bfc09d6e37b8f334f1a7, 7901c1a8effbe5f89673bfc09d6e37b8f334f1a7, 7901c1a8effbe5f89673bfc09d6e37b8f334f1a7, 7901c1a8effbe5f89673bfc09d6e37b8f334f1a7, 7901c1a8effbe5f89673bfc09d6e37b8f334f1a7, 7901c1a8effbe5f89673bfc09d6e37b8f334f1a7, 7901c1a8effbe5f89673bfc09d6e37b8f334f1a7, 7901c1a8effbe5f89673bfc09d6e37b8f334f1a7unaffected
LinuxLinux3.18, 0, 5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.63, 6.17.13, 6.18.2, 6.19affected
Weakness

CWE details

No CWE listed

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