CVE-2023-53463 (GCVE-0-2023-53463)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:42 – Updated: 2026-08-05 09:14
VLAI
Title
ibmvnic: Do not reset dql stats on NON_FATAL err
Summary
In the Linux kernel, the following vulnerability has been resolved: ibmvnic: Do not reset dql stats on NON_FATAL err All ibmvnic resets, make a call to netdev_tx_reset_queue() when re-opening the device. netdev_tx_reset_queue() resets the num_queued and num_completed byte counters. These stats are used in Byte Queue Limit (BQL) algorithms. The difference between these two stats tracks the number of bytes currently sitting on the physical NIC. ibmvnic increases the number of queued bytes though calls to netdev_tx_sent_queue() in the drivers xmit function. When, VIOS reports that it is done transmitting bytes, the ibmvnic device increases the number of completed bytes through calls to netdev_tx_completed_queue(). It is important to note that the driver batches its transmit calls and num_queued is increased every time that an skb is added to the next batch, not necessarily when the batch is sent to VIOS for transmission. Unlike other reset types, a NON FATAL reset will not flush the sub crq tx buffers. Therefore, it is possible for the batched skb array to be partially full. So if there is call to netdev_tx_reset_queue() when re-opening the device, the value of num_queued (0) would not account for the skb's that are currently batched. Eventually, when the batch is sent to VIOS, the call to netdev_tx_completed_queue() would increase num_completed to a value greater than the num_queued. This causes a BUG_ON crash: ibmvnic 30000002: Firmware reports error, cause: adapter problem. Starting recovery... ibmvnic 30000002: tx error 600 ibmvnic 30000002: tx error 600 ibmvnic 30000002: tx error 600 ibmvnic 30000002: tx error 600 ------------[ cut here ]------------ kernel BUG at lib/dynamic_queue_limits.c:27! Oops: Exception in kernel mode, sig: 5 [....] NIP dql_completed+0x28/0x1c0 LR ibmvnic_complete_tx.isra.0+0x23c/0x420 [ibmvnic] Call Trace: ibmvnic_complete_tx.isra.0+0x3f8/0x420 [ibmvnic] (unreliable) ibmvnic_interrupt_tx+0x40/0x70 [ibmvnic] __handle_irq_event_percpu+0x98/0x270 ---[ end trace ]--- Therefore, do not reset the dql stats when performing a NON_FATAL reset.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0d973388185d49add56b81ca82fa5e4348019df8 , < b8aedf29db1280c83191fc9579ae605791faf97f (git)
Affected: 0d973388185d49add56b81ca82fa5e4348019df8 , < f67ef8f9f6776e2b2073cad7c5cf29de850f83d7 (git)
Affected: 0d973388185d49add56b81ca82fa5e4348019df8 , < 91a0632e73070928aafeb36b3cc676843c716931 (git)
Affected: 0d973388185d49add56b81ca82fa5e4348019df8 , < 48538ccb825b05544ec308a509e2cc9c013402db (git)
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Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.121 , ≤ 5.15.* (semver)
Unaffected: 6.1.39 , ≤ 6.1.* (semver)
Unaffected: 6.4.4 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/ibm/ibmvnic.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nibmvnic: Do not reset dql stats on NON_FATAL err\n\nAll ibmvnic resets, make a call to netdev_tx_reset_queue() when\nre-opening the device. netdev_tx_reset_queue() resets the num_queued\nand num_completed byte counters. These stats are used in Byte Queue\nLimit (BQL) algorithms. The difference between these two stats tracks\nthe number of bytes currently sitting on the physical NIC. ibmvnic\nincreases the number of queued bytes though calls to\nnetdev_tx_sent_queue() in the drivers xmit function. When, VIOS reports\nthat it is done transmitting bytes, the ibmvnic device increases the\nnumber of completed bytes through calls to netdev_tx_completed_queue().\nIt is important to note that the driver batches its transmit calls and\nnum_queued is increased every time that an skb is added to the next\nbatch, not necessarily when the batch is sent to VIOS for transmission.\n\nUnlike other reset types, a NON FATAL reset will not flush the sub crq\ntx buffers. Therefore, it is possible for the batched skb array to be\npartially full. So if there is call to netdev_tx_reset_queue() when\nre-opening the device, the value of num_queued (0) would not account\nfor the skb\u0027s that are currently batched. Eventually, when the batch\nis sent to VIOS, the call to netdev_tx_completed_queue() would increase\nnum_completed to a value greater than the num_queued. This causes a\nBUG_ON crash:\n\nibmvnic 30000002: Firmware reports error, cause: adapter problem.\nStarting recovery...\nibmvnic 30000002: tx error 600\nibmvnic 30000002: tx error 600\nibmvnic 30000002: tx error 600\nibmvnic 30000002: tx error 600\n------------[ cut here ]------------\nkernel BUG at lib/dynamic_queue_limits.c:27!\nOops: Exception in kernel mode, sig: 5\n[....]\nNIP dql_completed+0x28/0x1c0\nLR ibmvnic_complete_tx.isra.0+0x23c/0x420 [ibmvnic]\nCall Trace:\nibmvnic_complete_tx.isra.0+0x3f8/0x420 [ibmvnic] (unreliable)\nibmvnic_interrupt_tx+0x40/0x70 [ibmvnic]\n__handle_irq_event_percpu+0x98/0x270\n---[ end trace ]---\n\nTherefore, do not reset the dql stats when performing a NON_FATAL reset."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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              "value": "AV:N - The faulty state is created and consumed entirely in the network TX path \u2014 bytes accounted by `ibmvnic_xmit()` for in-flight packets and completed in the `ibmvnic_interrupt_tx()` handler \u2014 so a remote peer generating sustained traffic through the virtual NIC supplies the precondition that turns an adapter reset into a panic. Consistent with other ibmvnic TX-path crash CVEs scored AV:N.\nAC:L - No race must be won and no specific memory layout is needed; any sustained TX load keeps the batched skb array (`ind_bufp`) partially full, so once a NON_FATAL reset occurs the `num_completed \u003e num_queued` condition and the resulting BUG_ON are deterministic.\nPR:N - No credentials or local account are required \u2014 merely sending traffic to the affected interface is sufficient to keep the TX batch populated, and the reset path involves no authentication or capability check.\nUI:N - The crash occurs asynchronously in the TX-completion interrupt handler during automatic driver reset recovery; no administrator or user action is needed.\nS:U - The BUG_ON panics the kernel of the affected partition itself, with no crossing into a different security authority such as a hypervisor or peer partition.\nC:N - The defect is a byte-counter accounting mismatch caught by an explicit assertion in `dql_completed()`; no memory is read out of bounds and no kernel data is exposed to the attacker.\nI:N - Nothing is written out of bounds and no attacker-controlled data corrupts kernel state \u2014 the counters are driver-internal BQL statistics, and the assertion fires before any further processing.\nA:H - `BUG_ON()` in `dql_completed()` is reached from hard interrupt context via `ibmvnic_interrupt_tx()`, producing a kernel oops/panic (\"Oops: Exception in kernel mode, sig: 5\") that takes down the system."
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        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53463",
    "datePublished": "2025-10-01T11:42:34.308Z",
    "dateReserved": "2025-10-01T11:39:39.400Z",
    "dateUpdated": "2026-08-05T09:14:12.511Z",
    "state": "PUBLISHED"
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When, VIOS reports\\nthat it is done transmitting bytes, the ibmvnic device increases the\\nnumber of completed bytes through calls to netdev_tx_completed_queue().\\nIt is important to note that the driver batches its transmit calls and\\nnum_queued is increased every time that an skb is added to the next\\nbatch, not necessarily when the batch is sent to VIOS for transmission.\\n\\nUnlike other reset types, a NON FATAL reset will not flush the sub crq\\ntx buffers. Therefore, it is possible for the batched skb array to be\\npartially full. So if there is call to netdev_tx_reset_queue() when\\nre-opening the device, the value of num_queued (0) would not account\\nfor the skb\u0027s that are currently batched. Eventually, when the batch\\nis sent to VIOS, the call to netdev_tx_completed_queue() would increase\\nnum_completed to a value greater than the num_queued. This causes a\\nBUG_ON crash:\\n\\nibmvnic 30000002: Firmware reports error, cause: adapter problem.\\nStarting recovery...\\nibmvnic 30000002: tx error 600\\nibmvnic 30000002: tx error 600\\nibmvnic 30000002: tx error 600\\nibmvnic 30000002: tx error 600\\n------------[ cut here ]------------\\nkernel BUG at lib/dynamic_queue_limits.c:27!\\nOops: Exception in kernel mode, sig: 5\\n[....]\\nNIP dql_completed+0x28/0x1c0\\nLR ibmvnic_complete_tx.isra.0+0x23c/0x420 [ibmvnic]\\nCall Trace:\\nibmvnic_complete_tx.isra.0+0x3f8/0x420 [ibmvnic] (unreliable)\\nibmvnic_interrupt_tx+0x40/0x70 [ibmvnic]\\n__handle_irq_event_percpu+0x98/0x270\\n---[ end trace ]---\\n\\nTherefore, do not reset the dql stats when performing a NON_FATAL 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:18:34+00:00",
      "cve": "CVE-2023-53463",
      "id": "CVE-2023-53463",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ibmvnic: Do not reset dql stats on NON_FATAL err",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53463.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-23T02:14:58Z",
      "cve": "CVE-2023-53463",
      "id": "CVE-2023-53463",
      "initial_release_date": "2025-10-01T23:30:47Z",
      "product_status:known_affected": "395",
      "product_status:known_not_affected": "108",
      "product_status:recommended": "552",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53463",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53463.json",
      "version": "49"
    }
  }
}



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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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  • 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.
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  • 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.


Detection rules are retrieved from Rulezet.