Riskcovery

CVE-2023-3609

Use-after-free in Linux kernel's net/sched: cls_u32 component

State
Published
Severity
7.8 High
Published
Jul 21, 2023
Updated
Oct 14, 2026
Reserved
Jul 10, 2023

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HGoogle

Weaknesses

Affected Products

ProductVersions
KernelLinux
  • 4.14.0 to before 4.14.322Affected
  • 4.15.0 to before 4.19.291Affected
  • 4.20.0 to before 5.4.248Affected
  • 5.5.0 to before 5.10.185Affected
  • 5.11.0 to before 5.15.118Affected
  • 5.16.0 to before 6.1.35Affected
  • 6.2.0 to before 6.3.9Affected
  • 6.4.0Not affected
  • 04c55383fa5689357bcdd2c8036725a55ed632bcNot affected

References

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