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CVE-2023-3609

7.8 high exploit SSVC exploitation: none Modified
NVD · CVE.org

A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation. If tcf_change_indev() fails, u32_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability. We recommend upgrading past commit 04c55383fa5689357bcdd2c8036725a55ed632bc.

Fix

Public exploits 1

Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.

Patch, vendor advisory and mitigation references on NVD 6

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 7.8 · linux, debianNVD modified 2026-10-14 21:17

Affected (CPE criteria) 9

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.4:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.4:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.4:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.4:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.4:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.4:rc6:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

References 18