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

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-05-01 14:15
VLAI?
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
References
Impacted 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)
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    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)
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{
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        {
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          "product": "Linux",
          "programFiles": [
            "net/sched/cls_api.c"
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              "lessThanOrEqual": "5.15.*",
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              "lessThanOrEqual": "6.12.*",
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              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "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": "2026-05-01T14:15:33.922Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "dateReserved": "2026-05-01T14:12:55.977Z",
    "dateUpdated": "2026-05-01T14:15:33.922Z",
    "state": "PUBLISHED"
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.



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