CVE-2026-43035

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

State: Published
Severity: Not scored
Published: May 1, 2026
Updated: Oct 15, 2026
Reserved: May 1, 2026

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before 903c3405cfcc7700260e456ab66a5867586c9e69Affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before 71a3eda7e850ae844cb8993065f4e410c11a46ceAffected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before 4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3Affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before e35f5195cd44ff4053fbc5d71ea97681728a0099Affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before d6db08484c6cb3d4ad696246f9d288eceba2a078Affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before 906997ea3766c24fbbf9cc4bf17c047315bbd138Affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before 1091b3c174441a52fdbb92e2fe00338f9371a91cAffected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before e6e3eb5ee89ac4c163d46429391c889a1bb5e404Affected
LinuxLinux	4.19Affected before 4.19Not affected 5.10.253 through 5.10.Not affected 5.15.203 through 5.15.Not affected 6.1.168 through 6.1.Not affected 6.6.134 through 6.6.Not affected 6.12.81 through 6.12.Not affected 6.18.22 through 6.18.Not affected 6.19.12 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before 903c3405cfcc7700260e456ab66a5867586c9e69Affected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before 71a3eda7e850ae844cb8993065f4e410c11a46ceAffected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before 4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3Affected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before e35f5195cd44ff4053fbc5d71ea97681728a0099Affected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before d6db08484c6cb3d4ad696246f9d288eceba2a078Affected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before 906997ea3766c24fbbf9cc4bf17c047315bbd138Affected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before 1091b3c174441a52fdbb92e2fe00338f9371a91cAffected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e to before e6e3eb5ee89ac4c163d46429391c889a1bb5e404Affected

LinuxLinux

4.19Affected
before 4.19Not affected
5.10.253 through 5.10.*Not affected
5.15.203 through 5.15.*Not affected
6.1.168 through 6.1.*Not affected
6.6.134 through 6.6.*Not affected
6.12.81 through 6.12.*Not affected
6.18.22 through 6.18.*Not affected
6.19.12 through 6.19.*Not affected
7.0 and laterNot affected

References

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