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CVE Record

CVE-2023-53705: ipv6: Fix out-of-bounds access in ipv6_find_tlv()

In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix out-of-bounds access in ipv6_find_tlv() optlen is fetched without checking whether there is more than one byte to parse. It can lead to out-of-bounds access. Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with SVACE.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2023-53705 is a Linux kernel IPv6 parsing flaw. The kernel may read past valid data while handling IPv6 TLV options. The public record does not provide CVSS, impact, or exploit evidence, so urgency depends on whether affected Linux kernels are present in important IPv6-enabled systems.

Executive priority

Treat as a kernel hygiene and exposure-management item until severity is clarified. Do not defer indefinitely, but prioritize based on asset criticality, IPv6 exposure, and whether vendor-supported kernel fixes are available.

Technical view

The issue is an out-of-bounds access in ipv6_find_tlv(). The kernel fetches optlen without first confirming enough bytes remain to parse. Linux stable commits are referenced as fixes. The source bundle does not define exploitability, crash behavior, privilege impact, or confidentiality impact.

Likely exposure

Exposure is likely limited to systems running Linux kernel versions identified as affected by the CVE record. IPv6-capable hosts, appliances, containers using host kernels, and managed Linux fleets should be checked against their distribution kernel packages.

Exploitation context

The bundle says this is not in KEV and provides no evidence of active exploitation. It also does not include public exploit details, proof-of-concept status, attack prerequisites, or confirmed real-world abuse.

Researcher notes

Evidence is sparse: no CVSS, CWE, exploit status, or impact detail is provided. The strongest technical signal is the upstream Linux description and stable fix references. Avoid assigning impact beyond out-of-bounds access without vendor or maintainer confirmation.

Mitigation direction

  • Inventory Linux kernel versions across servers, endpoints, appliances, and cloud images.
  • Apply vendor or distribution kernel updates that include the referenced stable fixes.
  • Prioritize internet-facing and security-sensitive IPv6-enabled Linux systems.
  • If patch timing is unclear, check distribution advisories for supported backports.
  • Reboot or live-patch as required for the kernel fix to take effect.

Validation and detection

  • Compare running kernel versions against vendor advisories for CVE-2023-53705.
  • Confirm installed kernel packages include the relevant stable fix or backport.
  • Verify systems have booted into the corrected kernel after maintenance.
  • Track unsupported or custom kernels separately for source-level fix confirmation.
Prepared
Confidence
medium
Sources
10

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-2023-53705 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
0ADP providers
9Source links

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.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxc61a404325093250b676f40ad8f4dd00f3bcab5f, c61a404325093250b676f40ad8f4dd00f3bcab5f, c61a404325093250b676f40ad8f4dd00f3bcab5f, c61a404325093250b676f40ad8f4dd00f3bcab5f, c61a404325093250b676f40ad8f4dd00f3bcab5f, c61a404325093250b676f40ad8f4dd00f3bcab5f, c61a404325093250b676f40ad8f4dd00f3bcab5f, c61a404325093250b676f40ad8f4dd00f3bcab5funaffected
LinuxLinux2.6.19, 0, 4.14.316, 4.19.284, 5.4.244, 5.10.181, 5.15.114, 6.1.31, 6.3.5, 6.4affected
Weakness

CWE details

No CWE listed

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