Use After Free in Linux Kernel
CVE-2023-3609
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.
Vulnerability class: Use-After-Free
EPSS: 0.004 (36.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux Kernel — versions 4.20.0, 5.16.0, 6.4.0
- Linux Linux_kernel — versions 6.4
- Debian Debian_linux — versions 10.0, 11.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve-coordination@google.com (Patch, Mailing List, patch, Vendor Advisory)
- cve-coordination@google.com (Vendor Advisory)
- cve-coordination@google.com (Third Party Advisory)
- cve-coordination@google.com (Third Party Advisory)
- cve-coordination@google.com (VDB Entry, Third Party Advisory)
- cve-coordination@google.com (Mailing List, Third Party Advisory)
- cve-coordination@google.com
- cve-coordination@google.com
Frequently asked questions
- What is CVE-2023-3609?
- CVE-2023-3609 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2023-07-21.
- How severe is CVE-2023-3609?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2023-3609 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.