CVE-2023-53094 (GCVE-0-2023-53094)
Vulnerability from cvelistv5
Published
2025-05-02 15:55
Modified
2026-08-05 09:12
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: tty: serial: fsl_lpuart: fix race on RX DMA shutdown From time to time DMA completion can come in the middle of DMA shutdown: <process ctx>: <IRQ>: lpuart32_shutdown() lpuart_dma_shutdown() del_timer_sync() lpuart_dma_rx_complete() lpuart_copy_rx_to_tty() mod_timer() lpuart_dma_rx_free() When the timer fires a bit later, sport->dma_rx_desc is NULL: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000004 pc : lpuart_copy_rx_to_tty+0xcc/0x5bc lr : lpuart_timer_func+0x1c/0x2c Call trace: lpuart_copy_rx_to_tty lpuart_timer_func call_timer_fn __run_timers.part.0 run_timer_softirq __do_softirq __irq_exit_rcu irq_exit handle_domain_irq gic_handle_irq call_on_irq_stack do_interrupt_handler ... To fix this fold del_timer_sync() into lpuart_dma_rx_free() after dmaengine_terminate_sync() to make sure timer will not be re-started in lpuart_copy_rx_to_tty() <= lpuart_dma_rx_complete().
References
Impacted products
Vendor Product Version
Linux Linux Version: 4a8588a1cf867333187d9ff071e6fbdab587d194
Version: 4a8588a1cf867333187d9ff071e6fbdab587d194
Version: 4a8588a1cf867333187d9ff071e6fbdab587d194
Version: 4a8588a1cf867333187d9ff071e6fbdab587d194
Version: 4a8588a1cf867333187d9ff071e6fbdab587d194
Version: 5716a781032693d0f812ed06528d98195e9df028
Version: 0d5cb6e8b4b62d8efd1a470615894276341d6db9
Version: 3.18.9   ≤
Version: 3.19.1   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/serial/fsl_lpuart.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "19a98d56dfedafb25652bdb9cd48a4e73ceba702",
              "status": "affected",
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            },
            {
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              "version": "0d5cb6e8b4b62d8efd1a470615894276341d6db9",
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            },
            {
              "lessThan": "3.19",
              "status": "affected",
              "version": "3.18.9",
              "versionType": "semver"
            },
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              "status": "affected",
              "version": "3.19.1",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/serial/fsl_lpuart.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.0"
            },
            {
              "lessThan": "4.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.177",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.105",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.23",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.177",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.105",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.23",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.8",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "3.18.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "3.19.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: fsl_lpuart: fix race on RX DMA shutdown\n\nFrom time to time DMA completion can come in the middle of DMA shutdown:\n\n\u003cprocess ctx\u003e:\t\t\t\t\u003cIRQ\u003e:\nlpuart32_shutdown()\n  lpuart_dma_shutdown()\n    del_timer_sync()\n\t\t\t\t\tlpuart_dma_rx_complete()\n\t\t\t\t\t  lpuart_copy_rx_to_tty()\n\t\t\t\t\t    mod_timer()\n    lpuart_dma_rx_free()\n\nWhen the timer fires a bit later, sport-\u003edma_rx_desc is NULL:\n\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000004\npc : lpuart_copy_rx_to_tty+0xcc/0x5bc\nlr : lpuart_timer_func+0x1c/0x2c\nCall trace:\n lpuart_copy_rx_to_tty\n lpuart_timer_func\n call_timer_fn\n __run_timers.part.0\n run_timer_softirq\n __do_softirq\n __irq_exit_rcu\n irq_exit\n handle_domain_irq\n gic_handle_irq\n call_on_irq_stack\n do_interrupt_handler\n ...\n\nTo fix this fold del_timer_sync() into lpuart_dma_rx_free() after\ndmaengine_terminate_sync() to make sure timer will not be re-started in\nlpuart_copy_rx_to_tty() \u003c= lpuart_dma_rx_complete()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable RX DMA shutdown path is reached via local tty operations (close \u2192 uart_shutdown, or tcsetattr \u2192 set_termios) on the fsl_lpuart device node (/dev/ttyLP*), not via network packets or a required physical plug-in attack.\nAC:L - An attacker who can open the LPUART tty controls the shutdown/set_termios side and can generate continuous UART RX (serial peer, Bluetooth HCI-over-UART traffic, or similar) to drive DMA completion IRQs, so both sides of the race are attacker-influenced and retryable.\nPR:L - Exploitation requires opening the serial tty device as an unprivileged local user with ordinary device permissions (e.g. dialout/tty group), not real root or init-namespace admin capabilities.\nUI:N - The attacker triggers the race themselves by opening the port and closing it or changing termios while RX DMA is active; no separate victim action is required.\nS:U - Impact stays within the kernel/host security authority (crash or memory corruption in the serial driver); this is not a VM escape, IOMMU bypass, or other cross-boundary breakout.\nC:H - After del_timer_sync, a DMA completion can re-arm the timer before lpuart_dma_rx_free finishes; the timer may run after kfree(rx_ring.buf) while dma_rx_desc is still non-NULL, so lpuart_copy_rx_to_tty can read freed DMA buffer contents into the tty flip buffer (UAF disclosure), especially on the set_termios path where the fd stays open.\nI:H - The same race yields use-after-free / dangling use of the DMA descriptor and RX ring (async_tx_ack writes through dma_rx_desc after terminate_sync may have recycled it, plus use of freed buffer state), which is memory corruption exploitable beyond a clean crash.\nA:H - The commonly observed outcome is a kernel NULL pointer dereference in lpuart_copy_rx_to_tty from lpuart_timer_func (oops/panic), and the UAF paths similarly cause reliable kernel crashes."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:12:45.604Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/19a98d56dfedafb25652bdb9cd48a4e73ceba702"
        },
        {
          "url": "https://git.kernel.org/stable/c/90530e7214c8a04dcdde57502d93fa96af288c38"
        },
        {
          "url": "https://git.kernel.org/stable/c/954fc9931f0aabf272b5674cf468affdd88d3a36"
        },
        {
          "url": "https://git.kernel.org/stable/c/2a36b444cace9580380467fd1183bb5e85bcc80a"
        },
        {
          "url": "https://git.kernel.org/stable/c/1be6f2b15f902c02e055ae0b419ca789200473c9"
        }
      ],
      "title": "tty: serial: fsl_lpuart: fix race on RX DMA shutdown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53094",
    "datePublished": "2025-05-02T15:55:39.045Z",
    "dateReserved": "2025-05-02T15:51:43.552Z",
    "dateUpdated": "2026-08-05T09:12:45.604Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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