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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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        "shortName": "Linux"
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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:2.3:o:linux:linux_kernel:6.3:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"A47F0FC3-CE52-4BA1-BA51-22F783938431\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/19a98d56dfedafb25652bdb9cd48a4e73ceba702\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1be6f2b15f902c02e055ae0b419ca789200473c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2a36b444cace9580380467fd1183bb5e85bcc80a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/90530e7214c8a04dcdde57502d93fa96af288c38\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/954fc9931f0aabf272b5674cf468affdd88d3a36\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "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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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.