CVE-2023-3609Use-after-free in Linux kernel's net/sched: cls_u32 component
Updated under an hour ago ()
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It affects Linux Kernel and 5 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-416
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Linux Kernel linux:linux_kernel | from 4.14.0 before 4.14.322; from 4.15.0 before 4.19.291; from 4.20.0 before 5.4.248; from 5.5.0 before 5.10.185; from 5.11.0 before 5.15.118; from 5.16.0 before 6.1.35; from 6.2.0 before 6.3.9; 6.4.0 not affected; and 1 more ranges | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | before V1.1 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 4.14 before 4.14.322; from 4.15 before 4.19.291; from 4.20 before 5.4.248; from 5.5 before 5.10.185; from 5.11 before 5.15.118; from 5.16 before 6.1.35; from 6.2 before 6.3.9; 6.4; and 5 more ranges | NVD |
debian debian_linux debian:debian_linux | 10.0; 11.0 | NVD |
References
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=04c55383fa5689357bcdd2c8036725a55ed632bcpatch, mailing-list, vendor-advisory
- https://kernel.dance/04c55383fa5689357bcdd2c8036725a55ed632bcvendor-advisory
- https://security.netapp.com/advisory/ntap-20230818-0005/third-party-advisory
- https://www.debian.org/security/2023/dsa-5480third-party-advisory
- http://packetstormsecurity.com/files/175072/Kernel-Live-Patch-Security-Notice-LSN-0098-1.htmlthird-party-advisory, vdb-entry
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.htmlmailing-list, third-party-advisory
- http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.htmlthird-party-advisory
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.htmlvendor-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-794697.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.