{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74652", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.923Z", "datePublished": "2026-08-22T15:32:27.799Z", "dateUpdated": "2026-08-25T05:41:10.525Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:41:10.525Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: amba-pl011: cancel RS485 hrtimers after freeing IRQ\n\nThe RS485 trigger hrtimers are embedded in the devm-managed port and can\nfire after it is freed. The IRQ handler can arm a timer, so free the IRQ\nfirst and then cancel both timers.\n\nComplete the RS485 stop without arming a timer, and cancel the timers\nin remove() for the suspend-then-unbind path, where shutdown is not\ncalled.\n\nThis issue was found by an in-house static analysis tool."}], "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 bug is in the PL011 UART/RS485 driver and is reached only via local tty access (open/ioctl TIOCSRS485, write, close) on /dev/ttyAMA* or similar nodes; it is not reachable from the network or from RS485 bus traffic alone without local device control.\nAC:L - An attacker with tty access can enable RS485, queue TX with RTS delay timers, and close or race teardown to arm hrtimers during shutdown/remove; they control both the TX state machine and teardown timing, making the race reliably triggerable.\nPR:L - Exploitation requires write access to the UART tty device (typically dialout group membership), not root; ioctl/write/close drive the RS485 timers and buggy shutdown path, while the suspend-then-unbind heap UAF needs admin but is not the minimum privilege bar.\nUI:N - No victim interaction is required; the attacker who holds the tty fd performs TIOCSRS485, transmission, and port close or coordinates teardown themselves without needing another user to act.\nS:U - Impact is confined to kernel memory and hardware on the same host (crash, corruption, potential privilege escalation); it does not cross VM, container, or IOMMU security boundaries.\nC:H - RS485 hrtimers embedded in the devm uart_amba_port can fire after the port is freed during remove or buggy shutdown, causing a use-after-free that exposes freed kernel heap contents and enables arbitrary memory read primitives.\nI:H - UAF timer callbacks (pl011_trigger_start_tx/pl011_trigger_stop_tx) continue operating on freed uart_amba_port memory, performing MMIO reads/writes and state updates that enable heap grooming and kernel data corruption or control-flow hijacking.\nA:H - Use-after-free and concurrent hrtimer callbacks during/after port teardown can cause kernel oops, panic, or hang; RS485 timers may also fire on a partially shut down UART, destabilizing the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/tty/serial/amba-pl011.c"], "versions": [{"version": "2c1fd53af21b8cb13878b054894d33d3383eb1f3", "lessThan": "759ead98a39fb625be302f9aa66290985dcaa325", "status": "affected", "versionType": "git"}, {"version": "2c1fd53af21b8cb13878b054894d33d3383eb1f3", "lessThan": "e57f0aa5c35be37218ba0e4887b241584dd4b2d2", "status": "affected", "versionType": "git"}, {"version": "2c1fd53af21b8cb13878b054894d33d3383eb1f3", "lessThan": "36672c8d7d14e9c43287528455d2c97b526ea6ad", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/tty/serial/amba-pl011.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.14", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/759ead98a39fb625be302f9aa66290985dcaa325"}, {"url": "https://git.kernel.org/stable/c/e57f0aa5c35be37218ba0e4887b241584dd4b2d2"}, {"url": "https://git.kernel.org/stable/c/36672c8d7d14e9c43287528455d2c97b526ea6ad"}], "title": "serial: amba-pl011: cancel RS485 hrtimers after freeing IRQ", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/tty/serial/amba-pl011.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "759ead98a39fb625be302f9aa66290985dcaa325", "status": "affected", "version": "2c1fd53af21b8cb13878b054894d33d3383eb1f3", "versionType": "git"}, {"lessThan": "e57f0aa5c35be37218ba0e4887b241584dd4b2d2", "status": "affected", "version": "2c1fd53af21b8cb13878b054894d33d3383eb1f3", "versionType": "git"}, {"lessThan": "36672c8d7d14e9c43287528455d2c97b526ea6ad", "status": "affected", "version": "2c1fd53af21b8cb13878b054894d33d3383eb1f3", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/tty/serial/amba-pl011.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: amba-pl011: cancel RS485 hrtimers after freeing IRQ\n\nThe RS485 trigger hrtimers are embedded in the devm-managed port and can\nfire after it is freed. The IRQ handler can arm a timer, so free the IRQ\nfirst and then cancel both timers.\n\nComplete the RS485 stop without arming a timer, and cancel the timers\nin remove() for the suspend-then-unbind path, where shutdown is not\ncalled.\n\nThis issue was found by an in-house static analysis tool."}], "id": "CVE-2026-74652", "lastModified": "2026-08-25T06:18:45.730", "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"}]}, "published": "2026-08-22T16:16:38.693", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/36672c8d7d14e9c43287528455d2c97b526ea6ad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/759ead98a39fb625be302f9aa66290985dcaa325"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e57f0aa5c35be37218ba0e4887b241584dd4b2d2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: serial: amba-pl011: cancel RS485 hrtimers after freeing IRQ", "id": "2521486", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521486"}, "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"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nserial: amba-pl011: cancel RS485 hrtimers after freeing IRQ\nThe RS485 trigger hrtimers are embedded in the devm-managed port and can\nfire after it is freed. The IRQ handler can arm a timer, so free the IRQ\nfirst and then cancel both timers.\nComplete the RS485 stop without arming a timer, and cancel the timers\nin remove() for the suspend-then-unbind path, where shutdown is not\ncalled.\nThis issue was found by an in-house static analysis tool.", "A flaw was found in the Linux kernel's amba-pl011 serial driver. The RS485 trigger high-resolution timers (hrtimers) can fire after the device management (devm)-managed port is freed. This occurs because the timers are not properly canceled before the interrupt request (IRQ) is freed, allowing a use-after-free condition. A local attacker could potentially exploit this to cause a denial of service."], "name": "CVE-2026-74652", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74652\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74652\nhttps://lore.kernel.org/linux-cve-announce/2026082226-CVE-2026-74652-3d26@gregkh/T"], "threat_severity": "Moderate"}