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CVE Record

CVE-2023-53733: net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode

In the Linux kernel, the following vulnerability has been resolved: net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode When u32_replace_hw_knode fails, we need to undo the tcf_bind_filter operation done at u32_set_parms.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

A Linux kernel networking component could leave filter-binding state inconsistent when a hardware offload update fails. Public sources only state the bug was resolved; they do not describe business impact, CVSS, exploitation, or affected distributions. Treat this as kernel maintenance exposure requiring vendor-backed patch verification, not emergency response from current evidence.

Executive priority

Set priority after vendor impact confirmation. Current public evidence lacks severity, exploit activity, and business-impact detail, so this should enter normal kernel patch governance unless your environment has delayed kernel updates or unsupported custom builds.

Technical view

In net/sched cls_u32, u32_set_parms performs tcf_bind_filter before u32_replace_hw_knode. If u32_replace_hw_knode fails, the resolved issue is that tcf_bind_filter must be undone. The stable references appear to implement rollback behavior. No CWE, CVSS vector, or impact class is provided in the source bundle.

Likely exposure

Exposure is Linux systems running affected kernel builds listed in the CVE record. Specific distributions, configurations, required privileges, or workloads are not identified. Validate exposure by matching deployed kernel packages to vendor advisories and the referenced stable commits.

Exploitation context

No active exploitation is supported by the supplied evidence. KEV is false, and the bundle provides no exploit reports, proof-of-concept status, attack preconditions, or impact details. Avoid assuming remote or local exploitability from the available text.

Researcher notes

Useful research focus is impact determination: what inconsistent tcf_bind_filter state enables, whether hardware offload paths are required, and what privileges are needed. The CVE text only identifies the failed rollback condition and stable kernel commits.

Mitigation direction

  • Check Linux distribution advisories for CVE-2023-53733 package status.
  • Update affected kernels through supported vendor channels when fixes are available.
  • Verify whether vendor kernels include the referenced stable commits.
  • Prioritize systems with custom kernels or delayed kernel patch cycles.

Validation and detection

  • Inventory Linux kernel versions across production and staging systems.
  • Compare kernel package changelogs against CVE-2023-53733 and referenced commits.
  • Confirm vendor backport status before marking patched systems safe.
  • Document systems where distro guidance is unavailable or inconclusive.
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-2023-53733 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
4Source 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
LinuxLinuxd34e3e181395192d6d1f50dd97bd7854e04e33a4, d34e3e181395192d6d1f50dd97bd7854e04e33a4, d34e3e181395192d6d1f50dd97bd7854e04e33a4unaffected
LinuxLinux4.7, 0, 6.1.42, 6.4.7, 6.5affected
Weakness

CWE details

No CWE listed

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