Vulnerability-Lookup

FKIE_CVE-2026-43035

Vulnerability from fkie_nvd - Published: 2026-05-01 15:16 - Updated: 2026-05-08 18:43

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1091b3c174441a52fdbb92e2fe00338f9371a91c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/71a3eda7e850ae844cb8993065f4e410c11a46ce	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/903c3405cfcc7700260e456ab66a5867586c9e69	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/906997ea3766c24fbbf9cc4bf17c047315bbd138	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d6db08484c6cb3d4ad696246f9d288eceba2a078	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e35f5195cd44ff4053fbc5d71ea97681728a0099	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e6e3eb5ee89ac4c163d46429391c889a1bb5e404	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A8DA957C-C958-43FF-BB9F-975A326709F9",
              "versionEndExcluding": "5.10.253",
              "versionStartIncluding": "4.19",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "20DDB3E9-AABF-4107-ADB0-5362AA067045",
              "versionEndExcluding": "5.15.203",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E2DDDCA1-6DAB-4018-B920-8F045DDD8D3B",
              "versionEndExcluding": "6.1.168",
              "versionStartIncluding": "5.16",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F56F925B-BAF8-4F4B-B62F-1496AF19A307",
              "versionEndExcluding": "6.6.134",
              "versionStartIncluding": "6.2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "6EF80433-B33B-43C5-8E64-0FA7B8DCE1BC",
              "versionEndExcluding": "6.12.81",
              "versionStartIncluding": "6.7",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C9DF8BCE-36D3-475D-9D21-19E4F02F9029",
              "versionEndExcluding": "6.18.22",
              "versionStartIncluding": "6.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36",
              "versionEndExcluding": "6.19.12",
              "versionStartIncluding": "6.19",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*",
              "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*",
              "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*",
              "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*",
              "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-43035",
  "lastModified": "2026-05-08T18:43:05.513",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-05-01T15:16:48.147",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/1091b3c174441a52fdbb92e2fe00338f9371a91c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/71a3eda7e850ae844cb8993065f4e410c11a46ce"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/903c3405cfcc7700260e456ab66a5867586c9e69"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/906997ea3766c24fbbf9cc4bf17c047315bbd138"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/d6db08484c6cb3d4ad696246f9d288eceba2a078"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/e35f5195cd44ff4053fbc5d71ea97681728a0099"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/e6e3eb5ee89ac4c163d46429391c889a1bb5e404"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-908"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-05-11 22:16

Title

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

Summary

Severity

No CVSS data available.

Assigner

Linux

References

8 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

2 products

Vendor	Product	Version
Linux	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	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

To clipboard

{
  "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",
          "versions": [
            {
              "lessThan": "903c3405cfcc7700260e456ab66a5867586c9e69",
              "status": "affected",
              "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
              "versionType": "git"
            },
            {
              "lessThan": "71a3eda7e850ae844cb8993065f4e410c11a46ce",
              "status": "affected",
              "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
              "versionType": "git"
            },
            {
              "lessThan": "4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3",
              "status": "affected",
              "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
              "versionType": "git"
            },
            {
              "lessThan": "e35f5195cd44ff4053fbc5d71ea97681728a0099",
              "status": "affected",
              "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
              "versionType": "git"
            },
            {
              "lessThan": "d6db08484c6cb3d4ad696246f9d288eceba2a078",
              "status": "affected",
              "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
              "versionType": "git"
            },
            {
              "lessThan": "906997ea3766c24fbbf9cc4bf17c047315bbd138",
              "status": "affected",
              "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
              "versionType": "git"
            },
            {
              "lessThan": "1091b3c174441a52fdbb92e2fe00338f9371a91c",
              "status": "affected",
              "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
              "versionType": "git"
            },
            {
              "lessThan": "e6e3eb5ee89ac4c163d46429391c889a1bb5e404",
              "status": "affected",
              "version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sched/cls_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "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",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.168",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.134",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.81",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.22",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.12",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:16:27.484Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/903c3405cfcc7700260e456ab66a5867586c9e69"
        },
        {
          "url": "https://git.kernel.org/stable/c/71a3eda7e850ae844cb8993065f4e410c11a46ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/e35f5195cd44ff4053fbc5d71ea97681728a0099"
        },
        {
          "url": "https://git.kernel.org/stable/c/d6db08484c6cb3d4ad696246f9d288eceba2a078"
        },
        {
          "url": "https://git.kernel.org/stable/c/906997ea3766c24fbbf9cc4bf17c047315bbd138"
        },
        {
          "url": "https://git.kernel.org/stable/c/1091b3c174441a52fdbb92e2fe00338f9371a91c"
        },
        {
          "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",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43035",
    "datePublished": "2026-05-01T14:15:33.922Z",
    "dateReserved": "2026-05-01T14:12:55.977Z",
    "dateUpdated": "2026-05-11T22:16:27.484Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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

FKIE_CVE-2026-43035

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

Tags

Sightings

Nomenclature