net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak

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Summary

CVECVE-2026-43035
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:48 UTC
Updated2026-07-14 13:18:53 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000240000 probability, percentile 0.068060000 (date 2026-05-05)

Problem Types: CWE-908

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e 903c3405cfcc7700260e456ab66a5867586c9e69 git Not specified
CNA Linux Linux affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e 71a3eda7e850ae844cb8993065f4e410c11a46ce git Not specified
CNA Linux Linux affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e 4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3 git Not specified
CNA Linux Linux affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e e35f5195cd44ff4053fbc5d71ea97681728a0099 git Not specified
CNA Linux Linux affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e d6db08484c6cb3d4ad696246f9d288eceba2a078 git Not specified
CNA Linux Linux affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e 906997ea3766c24fbbf9cc4bf17c047315bbd138 git Not specified
CNA Linux Linux affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e 1091b3c174441a52fdbb92e2fe00338f9371a91c git Not specified
CNA Linux Linux affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e e6e3eb5ee89ac4c163d46429391c889a1bb5e404 git Not specified
CNA Linux Linux affected 4.19 Not specified
CNA Linux Linux unaffected 4.19 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1091b3c174441a52fdbb92e2fe00338f9371a91c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-082556.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/e6e3eb5ee89ac4c163d46429391c889a1bb5e404 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-019113.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/71a3eda7e850ae844cb8993065f4e410c11a46ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/903c3405cfcc7700260e456ab66a5867586c9e69 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d6db08484c6cb3d4ad696246f9d288eceba2a078 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/906997ea3766c24fbbf9cc4bf17c047315bbd138 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e35f5195cd44ff4053fbc5d71ea97681728a0099 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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