CVE-2026-98567 (GCVE-0-2026-98567)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:18 – Updated: 2026-10-19 09:21
VLAI
Title
net: xps: reject an out of range traffic class
Summary
In the Linux kernel, the following vulnerability has been resolved: net: xps: reject an out of range traffic class Only the entries below dev->num_tc are valid in dev->tc_to_txq[], and dev->prio_tc_map[] may only name classes below it. netdev_set_num_tc() lowers dev->num_tc without touching either array. netdev_txq_to_tc() walks all TC_MAX_QUEUE slots and netdev_get_prio_tc_map() returns the entry as it stands, so a leftover entry is handed out as a traffic class >= dev->num_tc. Taking that class from netdev_txq_to_tc(), __netif_set_xps_queue() rejects only a negative one and indexes an XPS map sized for dev->num_tc classes: tci = j * num_tc + tc; RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); attr_map[] holds nr_ids * num_tc entries and j runs over the ids named in the mask, so a class that is not below num_tc pushes tci past the end of the map for the last ids and the store overruns it. Any caller that lowers num_tc leaves such entries behind, and mqprio_destroy() tears down with netdev_set_num_tc(dev, 0) rather than netdev_reset_tc(). After mqprio with 8 classes then 1, tc_to_txq[1..7] still describe txq 1..7. The splat is from an XPS write to txq 2 on a veth with 8 rx queues: attr_map[] has 8 * 1 entries, tci = j + 2, and j == 6 stores one past the end of the 88-byte map: BUG: KASAN: slab-out-of-bounds in __netif_set_xps_queue (net/core/dev.c:2954) Write of size 8 at addr ffff88813016bc58 by task xps_oob/634 __netif_set_xps_queue (net/core/dev.c:2954) xps_rxqs_store (net/core/net-sysfs.c:1880) netdev_queue_attr_store (net/core/net-sysfs.c:1390) Allocated by task 634: __kmalloc_noprof (mm/slub.c:5439) __netif_set_xps_queue (net/core/dev.c:2937) The buggy address is located 0 bytes to the right of allocated 88-byte region [ffff88813016bc00, ffff88813016bc58) Reject a class the map has no room for.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 184c449f91fef521042970cca46bd5cdfc0e3a37 , < 967e10f40a0c6732db299cbe001df0e859196055 (git)
Affected: 184c449f91fef521042970cca46bd5cdfc0e3a37 , < 1cb8e40525a72c9f1e1cf94c68c172b3b9bbdc81 (git)
Affected: 184c449f91fef521042970cca46bd5cdfc0e3a37 , < 6ea8f643053f33622f9116e4e1db58306ece45e3 (git)
Affected: 184c449f91fef521042970cca46bd5cdfc0e3a37 , < 9e841723ba482d41ecbf90241c756a16cdfea949 (git)
Affected: 184c449f91fef521042970cca46bd5cdfc0e3a37 , < eff227a3cb4d0089fbb85c73480bf8abf2e5ae7f (git)
Affected: 184c449f91fef521042970cca46bd5cdfc0e3a37 , < 2cc1c3977acbffc417fb5b57699d1df3dcffb5fd (git)
Affected: 184c449f91fef521042970cca46bd5cdfc0e3a37 , < 930318290d8509e864c015fe6c9239470b3c579c (git)
Affected: 184c449f91fef521042970cca46bd5cdfc0e3a37 , < 4da3b7b8b50f3e2fde54a4c18a82a8e3f6223910 (git)
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Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: xps: reject an out of range traffic class\n\nOnly the entries below dev-\u003enum_tc are valid in dev-\u003etc_to_txq[], and\ndev-\u003eprio_tc_map[] may only name classes below it. netdev_set_num_tc()\nlowers dev-\u003enum_tc without touching either array.\n\nnetdev_txq_to_tc() walks all TC_MAX_QUEUE slots and\nnetdev_get_prio_tc_map() returns the entry as it stands, so a leftover\nentry is handed out as a traffic class \u003e= dev-\u003enum_tc. Taking that\nclass from netdev_txq_to_tc(), __netif_set_xps_queue() rejects only a\nnegative one and indexes an XPS map sized for dev-\u003enum_tc classes:\n\n\ttci = j * num_tc + tc;\n\tRCU_INIT_POINTER(new_dev_maps-\u003eattr_map[tci], map);\n\nattr_map[] holds nr_ids * num_tc entries and j runs over the ids named\nin the mask, so a class that is not below num_tc pushes tci past the end\nof the map for the last ids and the store overruns it.\n\nAny caller that lowers num_tc leaves such entries behind, and\nmqprio_destroy() tears down with netdev_set_num_tc(dev, 0) rather than\nnetdev_reset_tc(). After mqprio with 8 classes then 1, tc_to_txq[1..7]\nstill describe txq 1..7. The splat is from an XPS write to txq 2 on a\nveth with 8 rx queues: attr_map[] has 8 * 1 entries, tci = j + 2, and\nj == 6 stores one past the end of the 88-byte map:\n\n  BUG: KASAN: slab-out-of-bounds in __netif_set_xps_queue (net/core/dev.c:2954)\n  Write of size 8 at addr ffff88813016bc58 by task xps_oob/634\n   __netif_set_xps_queue (net/core/dev.c:2954)\n   xps_rxqs_store (net/core/net-sysfs.c:1880)\n   netdev_queue_attr_store (net/core/net-sysfs.c:1390)\n  Allocated by task 634:\n   __kmalloc_noprof (mm/slub.c:5439)\n   __netif_set_xps_queue (net/core/dev.c:2937)\n  The buggy address is located 0 bytes to the right of\n   allocated 88-byte region [ffff88813016bc00, ffff88813016bc58)\n\nReject a class the map has no room for."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:21:52.909Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/967e10f40a0c6732db299cbe001df0e859196055"
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          "url": "https://git.kernel.org/stable/c/1cb8e40525a72c9f1e1cf94c68c172b3b9bbdc81"
        },
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          "url": "https://git.kernel.org/stable/c/6ea8f643053f33622f9116e4e1db58306ece45e3"
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          "url": "https://git.kernel.org/stable/c/eff227a3cb4d0089fbb85c73480bf8abf2e5ae7f"
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          "url": "https://git.kernel.org/stable/c/4da3b7b8b50f3e2fde54a4c18a82a8e3f6223910"
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      "title": "net: xps: reject an out of range traffic class",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98567",
    "datePublished": "2026-10-18T15:18:33.721Z",
    "dateReserved": "2026-09-25T10:25:14.357Z",
    "dateUpdated": "2026-10-19T09:21:52.909Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98567",
      "date": "2026-11-01",
      "epss": "0.00216",
      "percentile": "0.12089"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-24T14:44:55.000Z",
      "cve": "CVE-2026-98567",
      "id": "msrc_CVE-2026-98567",
      "initial_release_date": "2026-10-20T01:08:28.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net: xps: reject an out of range traffic class",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98567.json",
      "version": "3"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: xps: reject an out of range traffic class\n\nOnly the entries below dev-\u003enum_tc are valid in dev-\u003etc_to_txq[], and\ndev-\u003eprio_tc_map[] may only name classes below it. netdev_set_num_tc()\nlowers dev-\u003enum_tc without touching either array.\n\nnetdev_txq_to_tc() walks all TC_MAX_QUEUE slots and\nnetdev_get_prio_tc_map() returns the entry as it stands, so a leftover\nentry is handed out as a traffic class \u003e= dev-\u003enum_tc. Taking that\nclass from netdev_txq_to_tc(), __netif_set_xps_queue() rejects only a\nnegative one and indexes an XPS map sized for dev-\u003enum_tc classes:\n\n\ttci = j * num_tc + tc;\n\tRCU_INIT_POINTER(new_dev_maps-\u003eattr_map[tci], map);\n\nattr_map[] holds nr_ids * num_tc entries and j runs over the ids named\nin the mask, so a class that is not below num_tc pushes tci past the end\nof the map for the last ids and the store overruns it.\n\nAny caller that lowers num_tc leaves such entries behind, and\nmqprio_destroy() tears down with netdev_set_num_tc(dev, 0) rather than\nnetdev_reset_tc(). After mqprio with 8 classes then 1, tc_to_txq[1..7]\nstill describe txq 1..7. The splat is from an XPS write to txq 2 on a\nveth with 8 rx queues: attr_map[] has 8 * 1 entries, tci = j + 2, and\nj == 6 stores one past the end of the 88-byte map:\n\n  BUG: KASAN: slab-out-of-bounds in __netif_set_xps_queue (net/core/dev.c:2954)\n  Write of size 8 at addr ffff88813016bc58 by task xps_oob/634\n   __netif_set_xps_queue (net/core/dev.c:2954)\n   xps_rxqs_store (net/core/net-sysfs.c:1880)\n   netdev_queue_attr_store (net/core/net-sysfs.c:1390)\n  Allocated by task 634:\n   __kmalloc_noprof (mm/slub.c:5439)\n   __netif_set_xps_queue (net/core/dev.c:2937)\n  The buggy address is located 0 bytes to the right of\n   allocated 88-byte region [ffff88813016bc00, ffff88813016bc58)\n\nReject a class the map has no room for."
          }
        ],
        "id": "CVE-2026-98567",
        "lastModified": "2026-10-19T10:19:14.597",
        "metrics": {},
        "published": "2026-10-18T16:17:08.870",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1cb8e40525a72c9f1e1cf94c68c172b3b9bbdc81"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2cc1c3977acbffc417fb5b57699d1df3dcffb5fd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4da3b7b8b50f3e2fde54a4c18a82a8e3f6223910"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6ea8f643053f33622f9116e4e1db58306ece45e3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/930318290d8509e864c015fe6c9239470b3c579c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/967e10f40a0c6732db299cbe001df0e859196055"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9e841723ba482d41ecbf90241c756a16cdfea949"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/eff227a3cb4d0089fbb85c73480bf8abf2e5ae7f"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T07:02:55+00:00",
      "cve": "CVE-2026-98567",
      "id": "CVE-2026-98567",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "279",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: xps: reject an out of range traffic class",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98567.json",
      "version": "3"
    }
  }
}



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