CVE-2025-22108 (GCVE-0-2025-22108)

Vulnerability from cvelistv5 – Published: 2025-04-16 14:12 – Updated: 2026-09-07 15:44
VLAI
Title
bnxt_en: Mask the bd_cnt field in the TX BD properly
Summary
In the Linux kernel, the following vulnerability has been resolved: bnxt_en: Mask the bd_cnt field in the TX BD properly The bd_cnt field in the TX BD specifies the total number of BDs for the TX packet. The bd_cnt field has 5 bits and the maximum number supported is 32 with the value 0. CONFIG_MAX_SKB_FRAGS can be modified and the total number of SKB fragments can approach or exceed the maximum supported by the chip. Add a macro to properly mask the bd_cnt field so that the value 32 will be properly masked and set to 0 in the bd_cnd field. Without this patch, the out-of-range bd_cnt value will corrupt the TX BD and may cause TX timeout. The next patch will check for values exceeding 32.
Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3948b05950fdd64002a5f182c65ba5cf2d53cf71 , < 9ee185e0f15594017a6f1a191ebe6630cfea5f74 (git)
Affected: 3948b05950fdd64002a5f182c65ba5cf2d53cf71 , < f60b41b815826f15c4d0323f923f398c423178d0 (git)
Affected: 3948b05950fdd64002a5f182c65ba5cf2d53cf71 , < 107b25db61122d8f990987895c2912927b8b6e3f (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.14.2 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbnxt_en: Mask the bd_cnt field in the TX BD properly\n\nThe bd_cnt field in the TX BD specifies the total number of BDs for\nthe TX packet.  The bd_cnt field has 5 bits and the maximum number\nsupported is 32 with the value 0.\n\nCONFIG_MAX_SKB_FRAGS can be modified and the total number of SKB\nfragments can approach or exceed the maximum supported by the chip.\nAdd a macro to properly mask the bd_cnt field so that the value 32\nwill be properly masked and set to 0 in the bd_cnd field.\n\nWithout this patch, the out-of-range bd_cnt value will corrupt the\nTX BD and may cause TX timeout.\n\nThe next patch will check for values exceeding 32."
        }
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      "metrics": [
        {
          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:N - bnxt_en is a datacenter NIC typically deployed on routing/bridging/VM hosts, where an unauthenticated remote peer\u0027s burst of segments is coalesced by GRO into an skb with 30+ fragments and forwarded out the bnxt port, reaching bnxt_start_xmit() with no linearization because the driver advertises NETIF_F_SG.\nAC:L - On a kernel built with CONFIG_MAX_SKB_FRAGS \u003e= 30 (the configuration in which the flaw exists, used in BIG TCP deployments), the attacker reliably drives the fragment count simply by sending a sustained burst, with no race or memory-layout condition to win.\nPR:N - In the forwarding scenario the trigger is ordinary unauthenticated network traffic transiting the host; no credentials or local account are needed, and the locally-reachable variant requires only an unprivileged socket.\nUI:N - Transmission happens automatically as part of normal packet forwarding or socket I/O; no victim action is required.\nS:U - The malformed descriptor, ring desynchronization, and subsequent device reset are all confined to the host kernel and its NIC, within a single security authority.\nC:L - The mis-parsed bd_cnt makes the chip consume descriptors beyond those the driver posted, so stale ring entries pointing at already-unmapped buffers can be DMA\u0027d and emitted onto the wire, exposing a bounded amount of freed kernel buffer content to the attacker\u0027s network.\nI:L - The corrupted bd_cnt and length-hint bits cause mis-framed and truncated frames to be placed on the wire, and the resulting completion desync leads to dma_unmap calls with mismatched address/length against buffers the NIC still owns.\nA:H - The commit states the out-of-range bd_cnt corrupts the TX BD and causes TX timeout; the desynchronized completion path hits WARN_ON_ONCE(1) in bnxt_sched_reset_txr() and queues BNXT_RESET_TASK_SP_EVENT, forcing a full device reset and repeatable loss of network connectivity (an immediate panic on panic_on_warn systems)."
            }
          ]
        }
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        "dateUpdated": "2026-09-07T15:44:43.232Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
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      "title": "bnxt_en: Mask the bd_cnt field in the TX BD properly",
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    "cveId": "CVE-2025-22108",
    "datePublished": "2025-04-16T14:12:55.737Z",
    "dateReserved": "2024-12-29T08:45:45.820Z",
    "dateUpdated": "2026-09-07T15:44:43.232Z",
    "state": "PUBLISHED"
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      "product_status:under_investigation": "20",
      "source": "Microsoft CSAF VEX",
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      "title": "bnxt_en: Mask the bd_cnt field in the TX BD properly",
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                  "drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c"
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                    "version": "6.12.109",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbnxt_en: Mask the bd_cnt field in the TX BD properly\n\nThe bd_cnt field in the TX BD specifies the total number of BDs for\nthe TX packet.  The bd_cnt field has 5 bits and the maximum number\nsupported is 32 with the value 0.\n\nCONFIG_MAX_SKB_FRAGS can be modified and the total number of SKB\nfragments can approach or exceed the maximum supported by the chip.\nAdd a macro to properly mask the bd_cnt field so that the value 32\nwill be properly masked and set to 0 in the bd_cnd field.\n\nWithout this patch, the out-of-range bd_cnt value will corrupt the\nTX BD and may cause TX timeout.\n\nThe next patch will check for values exceeding 32."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bnxt_en: Enmascarar correctamente el campo bd_cnt en el TX BD El campo bd_cnt en el TX BD especifica el n\u00famero total de BD para el paquete TX. El campo bd_cnt tiene 5 bits y el n\u00famero m\u00e1ximo admitido es 32 con el valor 0. CONFIG_MAX_SKB_FRAGS se puede modificar y el n\u00famero total de fragmentos SKB puede acercarse o superar el m\u00e1ximo admitido por el chip. Agregue una macro para enmascarar correctamente el campo bd_cnt para que el valor 32 se enmascare correctamente y se establezca en 0 en el campo bd_cnd. Sin este parche, el valor bd_cnt fuera de rango corromper\u00e1 el TX BD y puede causar tiempo de espera de TX. El siguiente parche verificar\u00e1 los valores que excedan 32."
          }
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        "id": "CVE-2025-22108",
        "lastModified": "2026-09-07T16:17:27.353",
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      "cve": "CVE-2025-22108",
      "id": "CVE-2025-22108",
      "initial_release_date": "2025-04-16T00:00:00+00:00",
      "product_status:known_affected": "184",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bnxt_en: Mask the bd_cnt field in the TX BD properly",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-22108.json",
      "version": "3"
    },
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      "current_release_date": "2026-08-29T01:24:50Z",
      "cve": "CVE-2025-22108",
      "id": "CVE-2025-22108",
      "initial_release_date": "2025-04-23T02:38:35Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "414",
      "product_status:recommended": "407",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-22108",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-22108.json",
      "version": "39"
    }
  }
}



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