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CVE-2023-53094 (GCVE-0-2023-53094)

Vulnerability from cvelistv5 – Published: 2025-05-02 15:55 – Updated: 2026-08-05 09:12
VLAI
Title
tty: serial: fsl_lpuart: fix race on RX DMA shutdown
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().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4a8588a1cf867333187d9ff071e6fbdab587d194 , < 19a98d56dfedafb25652bdb9cd48a4e73ceba702 (git)
Affected: 4a8588a1cf867333187d9ff071e6fbdab587d194 , < 90530e7214c8a04dcdde57502d93fa96af288c38 (git)
Affected: 4a8588a1cf867333187d9ff071e6fbdab587d194 , < 954fc9931f0aabf272b5674cf468affdd88d3a36 (git)
Affected: 4a8588a1cf867333187d9ff071e6fbdab587d194 , < 2a36b444cace9580380467fd1183bb5e85bcc80a (git)
Affected: 4a8588a1cf867333187d9ff071e6fbdab587d194 , < 1be6f2b15f902c02e055ae0b419ca789200473c9 (git)
Affected: 5716a781032693d0f812ed06528d98195e9df028 (git)
Affected: 0d5cb6e8b4b62d8efd1a470615894276341d6db9 (git)
Affected: 3.18.9 , < 3.19 (semver)
Affected: 3.19.1 , < 3.20 (semver)
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Linux Linux Affected: 4.0
Unaffected: 0 , < 4.0 (semver)
Unaffected: 5.10.177 , ≤ 5.10.* (semver)
Unaffected: 5.15.105 , ≤ 5.15.* (semver)
Unaffected: 6.1.23 , ≤ 6.1.* (semver)
Unaffected: 6.2.8 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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{
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          "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()."
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              "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."
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    "dateUpdated": "2026-08-05T09:12:45.604Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53094\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-02T16:15:28.363\",\"lastModified\":\"2026-08-04T10:18:54.930\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tty: serial: fsl_lpuart: fix race on RX DMA shutting De vez en cuando, la finalizaci\u00f3n de DMA puede llegar en medio del shutting de DMA: : : lpuart32_shutdown() lpuart_dma_shutdown() del_timer_sync() lpuart_dma_rx_complete() lpuart_copy_rx_to_tty() mod_timer() lpuart_dma_rx_free() Cuando el temporizador se activa un poco m\u00e1s tarde, sport-\u0026gt;dma_rx_desc es NULL: No se puede manejar la desreferencia del puntero NULL del kernel en la direcci\u00f3n virtual 0000000000000004 pc : lpuart_copy_rx_to_tty+0xcc/0x5bc lr : lpuart_timer_func+0x1c/0x2c Rastreo de llamadas: 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 ... Para solucionar esto, incorpore del_timer_sync() en lpuart_dma_rx_free() despu\u00e9s de dmaengine_terminate_sync() para asegurarse de que el temporizador no se reinicie en lpuart_copy_rx_to_tty() \u0026lt;= lpuart_dma_rx_complete().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/tty/serial/fsl_lpuart.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4a8588a1cf867333187d9ff071e6fbdab587d194\",\"lessThan\":\"19a98d56dfedafb25652bdb9cd48a4e73ceba702\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4a8588a1cf867333187d9ff071e6fbdab587d194\",\"lessThan\":\"90530e7214c8a04dcdde57502d93fa96af288c38\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4a8588a1cf867333187d9ff071e6fbdab587d194\",\"lessThan\":\"954fc9931f0aabf272b5674cf468affdd88d3a36\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4a8588a1cf867333187d9ff071e6fbdab587d194\",\"lessThan\":\"2a36b444cace9580380467fd1183bb5e85bcc80a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4a8588a1cf867333187d9ff071e6fbdab587d194\",\"lessThan\":\"1be6f2b15f902c02e055ae0b419ca789200473c9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5716a781032693d0f812ed06528d98195e9df028\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0d5cb6e8b4b62d8efd1a470615894276341d6db9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3.18.9\",\"lessThan\":\"3.19\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.19.1\",\"lessThan\":\"3.20\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/tty/serial/fsl_lpuart.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.177\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.105\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.23\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2.8\",\"lessThanOrEqual\":\"6.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.18.9\",\"versionEndExcluding\":\"3.19\",\"matchCriteriaId\":\"61CE8743-D751-40A8-950D-D06102297B58\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.19.1\",\"versionEndExcluding\":\"5.10.177\",\"matchCriteriaId\":\"81BB79F1-557B-4785-94D0-0DDD776FDC44\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.105\",\"matchCriteriaId\":\"0888AE70-CB0A-45C0-B9BD-A5371244C8DB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.23\",\"matchCriteriaId\":\"C6396026-EF6B-4933-AF27-B3AFE6E5506D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.2.8\",\"matchCriteriaId\":\"4011EC6B-7786-4709-B765-186FA31D6F7F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.3:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B8E3B0E8-FA27-4305-87BB-AF6C25B160CB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:21:04+00:00",
      "cve": "CVE-2023-53094",
      "id": "CVE-2023-53094",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "279",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "166",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tty: serial: fsl_lpuart: fix race on RX DMA shutdown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53094.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-06T17:05:27Z",
      "cve": "CVE-2023-53094",
      "id": "CVE-2023-53094",
      "initial_release_date": "2025-05-03T02:50:49Z",
      "product_status:known_affected": "636",
      "product_status:known_not_affected": "224",
      "product_status:recommended": "52",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53094",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53094.json",
      "version": "18"
    }
  }
}



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Taxonomy of the tags.





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

Author Source Type Date Other

Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • 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.