Vulnerability-Lookup

GHSA-W7CV-FRW4-84FJ

Vulnerability from github – Published: 2026-05-01 15:30 – Updated: 2026-05-01 15:30

Details

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.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43035"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-01T15:16:48Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak\n\nWhen building netlink messages, tc_chain_fill_node() never initializes\nthe tcm_info field of struct tcmsg. Since the allocation is not zeroed,\nkernel heap memory is leaked to userspace through this 4-byte field.\n\nThe fix simply zeroes tcm_info alongside the other fields that are\nalready initialized.",
  "id": "GHSA-w7cv-frw4-84fj",
  "modified": "2026-05-01T15:30:37Z",
  "published": "2026-05-01T15:30:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43035"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1091b3c174441a52fdbb92e2fe00338f9371a91c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71a3eda7e850ae844cb8993065f4e410c11a46ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/903c3405cfcc7700260e456ab66a5867586c9e69"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/906997ea3766c24fbbf9cc4bf17c047315bbd138"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d6db08484c6cb3d4ad696246f9d288eceba2a078"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e35f5195cd44ff4053fbc5d71ea97681728a0099"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e6e3eb5ee89ac4c163d46429391c889a1bb5e404"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-43035 (GCVE-0-2026-43035)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-05-01 14:15

Title

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

Summary

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.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/903c3405cfcc77002…
	https://git.kernel.org/stable/c/71a3eda7e850ae844…
	https://git.kernel.org/stable/c/4ae5d23f51fb91d7d…
	https://git.kernel.org/stable/c/e35f5195cd44ff405…
	https://git.kernel.org/stable/c/d6db08484c6cb3d4a…
	https://git.kernel.org/stable/c/906997ea3766c24fb…
	https://git.kernel.org/stable/c/1091b3c174441a52f…
	https://git.kernel.org/stable/c/e6e3eb5ee89ac4c16…

Impacted products

Vendor

Product

Version

Linux

Affected: 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e , < 903c3405cfcc7700260e456ab66a5867586c9e69 (git)
Affected: 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e , < 71a3eda7e850ae844cb8993065f4e410c11a46ce (git)
Affected: 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e , < 4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3 (git)
Affected: 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e , < e35f5195cd44ff4053fbc5d71ea97681728a0099 (git)
Affected: 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e , < d6db08484c6cb3d4ad696246f9d288eceba2a078 (git)
Affected: 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e , < 906997ea3766c24fbbf9cc4bf17c047315bbd138 (git)
Affected: 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e , < 1091b3c174441a52fdbb92e2fe00338f9371a91c (git)
Affected: 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e , < e6e3eb5ee89ac4c163d46429391c889a1bb5e404 (git)

Linux

Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/cls_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.134",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.253",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak\n\nWhen building netlink messages, tc_chain_fill_node() never initializes\nthe tcm_info field of struct tcmsg. Since the allocation is not zeroed,\nkernel heap memory is leaked to userspace through this 4-byte field.\n\nThe fix simply zeroes tcm_info alongside the other fields that are\nalready initialized."
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      "providerMetadata": {
        "dateUpdated": "2026-05-01T14:15:33.922Z",
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        },
        {
          "url": "https://git.kernel.org/stable/c/e6e3eb5ee89ac4c163d46429391c889a1bb5e404"
        }
      ],
      "title": "net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43035",
    "datePublished": "2026-05-01T14:15:33.922Z",
    "dateReserved": "2026-05-01T14:12:55.977Z",
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    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-W7CV-FRW4-84FJ

CVE-2026-43035 (GCVE-0-2026-43035)

Tags

Sightings

Nomenclature