CVE-2026-43035net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak When building netlink messages, tc_chain_fill_node() never initializes the tcm_info field of struct tcmsg. Since the allocation is not zeroed, kernel heap memory is leaked to userspace through this 4-byte field. The fix simply zeroes tcm_info alongside the other fields that are already initialized.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e before 903c3405cfcc7700260e456ab66a5867586c9e69; from 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e before 71a3eda7e850ae844cb8993065f4e410c11a46ce; 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e builds before 4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3; from 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e before e35f5195cd44ff4053fbc5d71ea97681728a0099; from 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e before d6db08484c6cb3d4ad696246f9d288eceba2a078; from 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e before 906997ea3766c24fbbf9cc4bf17c047315bbd138; from 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e before 1091b3c174441a52fdbb92e2fe00338f9371a91c; from 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e before e6e3eb5ee89ac4c163d46429391c889a1bb5e404 | 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 V3.1.6 | 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 V3.1.6 | 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 V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 4.19 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; and 5 more ranges | NVD |
References
- https://git.kernel.org/stable/c/903c3405cfcc7700260e456ab66a5867586c9e69patch
- https://git.kernel.org/stable/c/71a3eda7e850ae844cb8993065f4e410c11a46cepatch
- https://git.kernel.org/stable/c/4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3patch
- https://git.kernel.org/stable/c/e35f5195cd44ff4053fbc5d71ea97681728a0099patch
- https://git.kernel.org/stable/c/d6db08484c6cb3d4ad696246f9d288eceba2a078patch
- https://git.kernel.org/stable/c/906997ea3766c24fbbf9cc4bf17c047315bbd138patch
- https://git.kernel.org/stable/c/1091b3c174441a52fdbb92e2fe00338f9371a91cpatch
- https://git.kernel.org/stable/c/e6e3eb5ee89ac4c163d46429391c889a1bb5e404patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.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.