CVE-2026-97966 (GCVE-0-2026-97966)
Vulnerability from cvelistv5
Published
2026-09-25 10:23
Modified
2026-10-19 09:11
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: octeontx2-pf: reset HTB scheduler topology before freeing queues HTB offload programs NIX_AF_TLxX_TOPOLOGY on QoS-allocated scheduler queues via otx2_qos_txschq_set_parent_topology(), but teardown freed those queues without clearing TOPOLOGY. The AF only restores PARENT and SCHEDULE on free, so PRIO_ANCHOR/RR_PRIO settings can survive in the shared scheduler pool and affect later allocations. Add otx2_qos_reset_schq_topology() and otx2_qos_free_hw_schq() to zero TL4 through TL2 TOPOLOGY before each schq is returned to the AF during hierarchy teardown and cfg rollback. Skip the aggregation level (TL1): it is a per-tx-link queue shared by the PF, default Tx hierarchy and VFs, and is not freed back to the AF by nix_txschq_free_one().
References
Impacted products
Vendor Product Version
Linux Linux Version: 5e6808b4c68d7882971514ab3279926eb07c8b2d
Version: 5e6808b4c68d7882971514ab3279926eb07c8b2d
Version: 5e6808b4c68d7882971514ab3279926eb07c8b2d
Version: 5e6808b4c68d7882971514ab3279926eb07c8b2d
Version: 5e6808b4c68d7882971514ab3279926eb07c8b2d
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/marvell/octeontx2/nic/qos.c"
          ],
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        {
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          "programFiles": [
            "drivers/net/ethernet/marvell/octeontx2/nic/qos.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "6.5"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "version": "6.6.158",
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
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                  "vulnerable": true
                },
                {
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                },
                {
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-pf: reset HTB scheduler topology before freeing queues\n\nHTB offload programs NIX_AF_TLxX_TOPOLOGY on QoS-allocated scheduler\nqueues via otx2_qos_txschq_set_parent_topology(), but teardown freed\nthose queues without clearing TOPOLOGY.  The AF only restores PARENT and\nSCHEDULE on free, so PRIO_ANCHOR/RR_PRIO settings can survive in the\nshared scheduler pool and affect later allocations.\n\nAdd otx2_qos_reset_schq_topology() and otx2_qos_free_hw_schq() to zero\nTL4 through TL2 TOPOLOGY before each schq is returned to the AF during\nhierarchy teardown and cfg rollback.  Skip the aggregation level (TL1):\nit is a per-tx-link queue shared by the PF, default Tx hierarchy and VFs,\nand is not freed back to the AF by nix_txschq_free_one()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:11:32.067Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/16c5c8ea5017952ff14c87626a45359d195dda6f"
        },
        {
          "url": "https://git.kernel.org/stable/c/0aa2dd6eaa347c7aab448df0eec0afcfe7489885"
        },
        {
          "url": "https://git.kernel.org/stable/c/621c99be42e3f5cb68a6af9480a255218a761c4e"
        },
        {
          "url": "https://git.kernel.org/stable/c/2df186418e17b30b319cf9ff81aad137692ab107"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef39fca8508597fa565cf2be72a884a712fb98af"
        }
      ],
      "title": "octeontx2-pf: reset HTB scheduler topology before freeing queues",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97966",
    "datePublished": "2026-09-25T10:23:08.543Z",
    "dateReserved": "2026-09-25T10:18:58.206Z",
    "dateUpdated": "2026-10-19T09:11:32.067Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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