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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-43035

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-43035

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
        "lessThan": "903c3405cfcc7700260e456ab66a5867586c9e69",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
        "lessThan": "71a3eda7e850ae844cb8993065f4e410c11a46ce",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
        "lessThan": "4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
        "lessThan": "e35f5195cd44ff4053fbc5d71ea97681728a0099",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
        "lessThan": "d6db08484c6cb3d4ad696246f9d288eceba2a078",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
        "lessThan": "906997ea3766c24fbbf9cc4bf17c047315bbd138",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
        "lessThan": "1091b3c174441a52fdbb92e2fe00338f9371a91c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
        "lessThan": "e6e3eb5ee89ac4c163d46429391c889a1bb5e404",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sched/cls_api.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.168",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.134",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.81",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.22",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.12",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sched/cls_api.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-43035

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28340 · Revision 1
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Publisher date
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