CVE-2023-53094

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2023-53094", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-05-02T15:51:43.552Z", "datePublished": "2025-05-02T15:55:39.045Z", "dateUpdated": "2026-08-05T09:12:45.604Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:12:45.604Z"}, "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<process ctx>:\t\t\t\t<IRQ>:\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->dma_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() <= lpuart_dma_rx_complete()."}], "metrics": [{"cvssV3_1": {"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"}, "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/tty/serial/fsl_lpuart.c"], "versions": [{"version": "4a8588a1cf867333187d9ff071e6fbdab587d194", "lessThan": "19a98d56dfedafb25652bdb9cd48a4e73ceba702", "status": "affected", "versionType": "git"}, {"version": "4a8588a1cf867333187d9ff071e6fbdab587d194", "lessThan": "90530e7214c8a04dcdde57502d93fa96af288c38", "status": "affected", "versionType": "git"}, {"version": "4a8588a1cf867333187d9ff071e6fbdab587d194", "lessThan": "954fc9931f0aabf272b5674cf468affdd88d3a36", "status": "affected", "versionType": "git"}, {"version": "4a8588a1cf867333187d9ff071e6fbdab587d194", "lessThan": "2a36b444cace9580380467fd1183bb5e85bcc80a", "status": "affected", "versionType": "git"}, {"version": "4a8588a1cf867333187d9ff071e6fbdab587d194", "lessThan": "1be6f2b15f902c02e055ae0b419ca789200473c9", "status": "affected", "versionType": "git"}, {"version": "5716a781032693d0f812ed06528d98195e9df028", "status": "affected", "versionType": "git"}, {"version": "0d5cb6e8b4b62d8efd1a470615894276341d6db9", "status": "affected", "versionType": "git"}, {"version": "3.18.9", "lessThan": "3.19", "status": "affected", "versionType": "semver"}, {"version": "3.19.1", "lessThan": "3.20", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/tty/serial/fsl_lpuart.c"], "versions": [{"version": "4.0", "status": "affected"}, {"version": "0", "lessThan": "4.0", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.177", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.105", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.23", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.2.8", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "5.10.177"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "5.15.105"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.1.23"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.2.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.3"}, {"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"}]}]}], "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"}}}}

{}

{"affected": [{"affectedData": [{"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", "version": "4a8588a1cf867333187d9ff071e6fbdab587d194", "versionType": "git"}, {"lessThan": "90530e7214c8a04dcdde57502d93fa96af288c38", "status": "affected", "version": "4a8588a1cf867333187d9ff071e6fbdab587d194", "versionType": "git"}, {"lessThan": "954fc9931f0aabf272b5674cf468affdd88d3a36", "status": "affected", "version": "4a8588a1cf867333187d9ff071e6fbdab587d194", "versionType": "git"}, {"lessThan": "2a36b444cace9580380467fd1183bb5e85bcc80a", "status": "affected", "version": "4a8588a1cf867333187d9ff071e6fbdab587d194", "versionType": "git"}, {"lessThan": "1be6f2b15f902c02e055ae0b419ca789200473c9", "status": "affected", "version": "4a8588a1cf867333187d9ff071e6fbdab587d194", "versionType": "git"}, {"status": "affected", "version": "5716a781032693d0f812ed06528d98195e9df028", "versionType": "git"}, {"status": "affected", "version": "0d5cb6e8b4b62d8efd1a470615894276341d6db9", "versionType": "git"}, {"lessThan": "3.19", "status": "affected", "version": "3.18.9", "versionType": "semver"}, {"lessThan": "3.20", "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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "61CE8743-D751-40A8-950D-D06102297B58", "versionEndExcluding": "3.19", "versionStartIncluding": "3.18.9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "81BB79F1-557B-4785-94D0-0DDD776FDC44", "versionEndExcluding": "5.10.177", "versionStartIncluding": "3.19.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0888AE70-CB0A-45C0-B9BD-A5371244C8DB", "versionEndExcluding": "5.15.105", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C6396026-EF6B-4933-AF27-B3AFE6E5506D", "versionEndExcluding": "6.1.23", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "4011EC6B-7786-4709-B765-186FA31D6F7F", "versionEndExcluding": "6.2.8", "versionStartIncluding": "6.2", "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", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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<process ctx>:\t\t\t\t<IRQ>:\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->dma_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() <= 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-&gt;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() &lt;= lpuart_dma_rx_complete()."}], "id": "CVE-2023-53094", "lastModified": "2026-08-04T10:18:54.930", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-05-02T16:15:28.363", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: tty: serial: fsl_lpuart: fix race on RX DMA shutdown", "id": "2363768", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363768"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntty: serial: fsl_lpuart: fix race on RX DMA shutdown\nFrom time to time DMA completion can come in the middle of DMA shutdown:\n<process ctx>:<IRQ>:\nlpuart32_shutdown()\nlpuart_dma_shutdown()\ndel_timer_sync()\nlpuart_dma_rx_complete()\nlpuart_copy_rx_to_tty()\nmod_timer()\nlpuart_dma_rx_free()\nWhen the timer fires a bit later, sport->dma_rx_desc is NULL:\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:\nlpuart_copy_rx_to_tty\nlpuart_timer_func\ncall_timer_fn\n__run_timers.part.0\nrun_timer_softirq\n__do_softirq\n__irq_exit_rcu\nirq_exit\nhandle_domain_irq\ngic_handle_irq\ncall_on_irq_stack\ndo_interrupt_handler\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() <= lpuart_dma_rx_complete()."], "name": "CVE-2023-53094", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-53094\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53094\nhttps://lore.kernel.org/linux-cve-announce/2025050221-CVE-2023-53094-a015@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:16:05.615506+00:00", "updated": "2025-07-12T22:16:05.615556+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}