CVE-2023-3609

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxKernel4.14.0 < 4.14.322affected
LinuxKernel4.15.0 < 4.19.291affected
LinuxKernel4.20.0 < 5.4.248affected
LinuxKernel5.5.0 < 5.10.185affected
LinuxKernel5.11.0 < 5.15.118affected
LinuxKernel5.16.0 < 6.1.35affected
LinuxKernel6.2.0 < 6.3.9affected
LinuxKernel6.4.0unaffected
LinuxKernel04c55383fa5689357bcdd2c8036725a55ed632bcunaffected

Weaknesses

  • CWE-416: CWE-416 Use After Free

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References