CVE-2025-38224 (GCVE-0-2025-38224)

Vulnerability from cvelistv5 – Published: 2025-07-04 13:37 – Updated: 2025-07-28 04:15
VLAI?
Title
can: kvaser_pciefd: refine error prone echo_skb_max handling logic
Summary
In the Linux kernel, the following vulnerability has been resolved: can: kvaser_pciefd: refine error prone echo_skb_max handling logic echo_skb_max should define the supported upper limit of echo_skb[] allocated inside the netdevice's priv. The corresponding size value provided by this driver to alloc_candev() is KVASER_PCIEFD_CAN_TX_MAX_COUNT which is 17. But later echo_skb_max is rounded up to the nearest power of two (for the max case, that would be 32) and the tx/ack indices calculated further during tx/rx may exceed the upper array boundary. Kasan reported this for the ack case inside kvaser_pciefd_handle_ack_packet(), though the xmit function has actually caught the same thing earlier. BUG: KASAN: slab-out-of-bounds in kvaser_pciefd_handle_ack_packet+0x2d7/0x92a drivers/net/can/kvaser_pciefd.c:1528 Read of size 8 at addr ffff888105e4f078 by task swapper/4/0 CPU: 4 UID: 0 PID: 0 Comm: swapper/4 Not tainted 6.15.0 #12 PREEMPT(voluntary) Call Trace: <IRQ> dump_stack_lvl lib/dump_stack.c:122 print_report mm/kasan/report.c:521 kasan_report mm/kasan/report.c:634 kvaser_pciefd_handle_ack_packet drivers/net/can/kvaser_pciefd.c:1528 kvaser_pciefd_read_packet drivers/net/can/kvaser_pciefd.c:1605 kvaser_pciefd_read_buffer drivers/net/can/kvaser_pciefd.c:1656 kvaser_pciefd_receive_irq drivers/net/can/kvaser_pciefd.c:1684 kvaser_pciefd_irq_handler drivers/net/can/kvaser_pciefd.c:1733 __handle_irq_event_percpu kernel/irq/handle.c:158 handle_irq_event kernel/irq/handle.c:210 handle_edge_irq kernel/irq/chip.c:833 __common_interrupt arch/x86/kernel/irq.c:296 common_interrupt arch/x86/kernel/irq.c:286 </IRQ> Tx max count definitely matters for kvaser_pciefd_tx_avail(), but for seq numbers' generation that's not the case - we're free to calculate them as would be more convenient, not taking tx max count into account. The only downside is that the size of echo_skb[] should correspond to the max seq number (not tx max count), so in some situations a bit more memory would be consumed than could be. Thus make the size of the underlying echo_skb[] sufficient for the rounded max tx value. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 352fbde14177d608a54120b6ff559ce5b3cf6238 , < d8a054b6e6824a8b52c3977ebd38c9583a63efac (git)
Affected: 8256e0ca601051933e9395746817f3801fa9a6bf , < a6550c9aa11e2f57f9cdaa6249cdd44d446be874 (git)
Affected: 8256e0ca601051933e9395746817f3801fa9a6bf , < 54ec8b08216f3be2cc98b33633d3c8ea79749895 (git)
Affected: f14512f3ee09cda986191c8dd7f54972afa2c763 (git)
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    Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.12.35 , ≤ 6.12.* (semver)
Unaffected: 6.15.4 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/can/kvaser_pciefd.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "6.15.4",
              "versionType": "semver"
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: kvaser_pciefd: refine error prone echo_skb_max handling logic\n\necho_skb_max should define the supported upper limit of echo_skb[]\nallocated inside the netdevice\u0027s priv. The corresponding size value\nprovided by this driver to alloc_candev() is KVASER_PCIEFD_CAN_TX_MAX_COUNT\nwhich is 17.\n\nBut later echo_skb_max is rounded up to the nearest power of two (for the\nmax case, that would be 32) and the tx/ack indices calculated further\nduring tx/rx may exceed the upper array boundary. Kasan reported this for\nthe ack case inside kvaser_pciefd_handle_ack_packet(), though the xmit\nfunction has actually caught the same thing earlier.\n\n BUG: KASAN: slab-out-of-bounds in kvaser_pciefd_handle_ack_packet+0x2d7/0x92a drivers/net/can/kvaser_pciefd.c:1528\n Read of size 8 at addr ffff888105e4f078 by task swapper/4/0\n\n CPU: 4 UID: 0 PID: 0 Comm: swapper/4 Not tainted 6.15.0 #12 PREEMPT(voluntary)\n Call Trace:\n  \u003cIRQ\u003e\n dump_stack_lvl lib/dump_stack.c:122\n print_report mm/kasan/report.c:521\n kasan_report mm/kasan/report.c:634\n kvaser_pciefd_handle_ack_packet drivers/net/can/kvaser_pciefd.c:1528\n kvaser_pciefd_read_packet drivers/net/can/kvaser_pciefd.c:1605\n kvaser_pciefd_read_buffer drivers/net/can/kvaser_pciefd.c:1656\n kvaser_pciefd_receive_irq drivers/net/can/kvaser_pciefd.c:1684\n kvaser_pciefd_irq_handler drivers/net/can/kvaser_pciefd.c:1733\n __handle_irq_event_percpu kernel/irq/handle.c:158\n handle_irq_event kernel/irq/handle.c:210\n handle_edge_irq kernel/irq/chip.c:833\n __common_interrupt arch/x86/kernel/irq.c:296\n common_interrupt arch/x86/kernel/irq.c:286\n  \u003c/IRQ\u003e\n\nTx max count definitely matters for kvaser_pciefd_tx_avail(), but for seq\nnumbers\u0027 generation that\u0027s not the case - we\u0027re free to calculate them as\nwould be more convenient, not taking tx max count into account. The only\ndownside is that the size of echo_skb[] should correspond to the max seq\nnumber (not tx max count), so in some situations a bit more memory would\nbe consumed than could be.\n\nThus make the size of the underlying echo_skb[] sufficient for the rounded\nmax tx value.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:15:36.982Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d8a054b6e6824a8b52c3977ebd38c9583a63efac"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6550c9aa11e2f57f9cdaa6249cdd44d446be874"
        },
        {
          "url": "https://git.kernel.org/stable/c/54ec8b08216f3be2cc98b33633d3c8ea79749895"
        }
      ],
      "title": "can: kvaser_pciefd: refine error prone echo_skb_max handling logic",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38224",
    "datePublished": "2025-07-04T13:37:39.305Z",
    "dateReserved": "2025-04-16T04:51:23.995Z",
    "dateUpdated": "2025-07-28T04:15:36.982Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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