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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
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        "summary": "Canonical URL",
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          "date": "2021-01-01T00:00:00Z",
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          "date": "2026-08-25T12:55:54Z",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: rp2: use 'request_firmware' instead of 'request_firmware_nowait'\n\nIn 'rp2_probe', the driver registers 'rp2_uart_interrupt' then calls\n'rp2_fw_cb' through 'request_firmware_nowait'. In 'rp2_fw_cb', if the\nfirmware don't exists, function just return without initializing ports\nof 'rp2_card'. But now the interrupt handler function has been\nregistered, and when an interrupt comes, 'rp2_uart_interrupt' may access\nthose ports then causing NULL pointer dereference or other bugs.\n\nBecause the driver does some initialization work in 'rp2_fw_cb', in\norder to make the driver ready to handle interrupts, 'request_firmware'\nshould be used instead of asynchronous 'request_firmware_nowait'.\n\nThis report reveals it:\n\nINFO: trying to register non-static key.\nthe code is fine but needs lockdep annotation.\nturning off the locking correctness validator.\nCPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.19.177-gdba4159c14ef-dirty #45\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-\ngc9ba5276e321-prebuilt.qemu.org 04/01/2014\nCall Trace:\n <IRQ>\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0xec/0x156 lib/dump_stack.c:118\n assign_lock_key kernel/locking/lockdep.c:727 [inline]\n register_lock_class+0x14e5/0x1ba0 kernel/locking/lockdep.c:753\n __lock_acquire+0x187/0x3750 kernel/locking/lockdep.c:3303\n lock_acquire+0x124/0x340 kernel/locking/lockdep.c:3907\n __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]\n _raw_spin_lock+0x32/0x50 kernel/locking/spinlock.c:144\n spin_lock include/linux/spinlock.h:329 [inline]\n rp2_ch_interrupt drivers/tty/serial/rp2.c:466 [inline]\n rp2_asic_interrupt.isra.9+0x15d/0x990 drivers/tty/serial/rp2.c:493\n rp2_uart_interrupt+0x49/0xe0 drivers/tty/serial/rp2.c:504\n __handle_irq_event_percpu+0xfb/0x770 kernel/irq/handle.c:149\n handle_irq_event_percpu+0x79/0x150 kernel/irq/handle.c:189\n handle_irq_event+0xac/0x140 kernel/irq/handle.c:206\n handle_fasteoi_irq+0x232/0x5c0 kernel/irq/chip.c:725\n generic_handle_irq_desc include/linux/irqdesc.h:155 [inline]\n handle_irq+0x230/0x3a0 arch/x86/kernel/irq_64.c:87\n do_IRQ+0xa7/0x1e0 arch/x86/kernel/irq.c:247\n common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:670\n </IRQ>\nRIP: 0010:native_safe_halt+0x28/0x30 arch/x86/include/asm/irqflags.h:61\nCode: 00 00 55 be 04 00 00 00 48 c7 c7 00 c2 2f 8c 48 89 e5 e8 fb 31 e7 f8\n8b 05 75 af 8d 03 85 c0 7e 07 0f 00 2d 8a 61 65 00 fb f4 <5d> c3 90 90 90\n90 90 90 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41\nRSP: 0018:ffff88806b71fcc8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffde\nRAX: 0000000000000000 RBX: ffffffff8bde7e48 RCX: ffffffff88a21285\nRDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff8c2fc200\nRBP: ffff88806b71fcc8 R08: fffffbfff185f840 R09: fffffbfff185f840\nR10: 0000000000000001 R11: fffffbfff185f840 R12: 0000000000000002\nR13: ffffffff8bea18a0 R14: 0000000000000000 R15: 0000000000000000\n arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]\n default_idle+0x6f/0x360 arch/x86/kernel/process.c:557\n arch_cpu_idle+0xf/0x20 arch/x86/kernel/process.c:548\n default_idle_call+0x3b/0x60 kernel/sched/idle.c:93\n cpuidle_idle_call kernel/sched/idle.c:153 [inline]\n do_idle+0x2ab/0x3c0 kernel/sched/idle.c:263\n cpu_startup_entry+0xcb/0xe0 kernel/sched/idle.c:369\n start_secondary+0x3b8/0x4e0 arch/x86/kernel/smpboot.c:271\n secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243\nBUG: unable to handle kernel NULL pointer dereference at 0000000000000010\nPGD 8000000056d27067 P4D 8000000056d27067 PUD 56d28067 PMD 0\nOops: 0000 [#1] PREEMPT SMP KASAN PTI\nCPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.19.177-gdba4159c14ef-dirty #45\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-\ngc9ba5276e321-prebuilt.qemu.org 04/01/2014\nRIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]\nRIP: 0010:rp2_ch_interrupt drivers/tty/serial/rp2.c:472 [inline]\nRIP: 0010:rp2_asic_interrupt.isra.9+0x181/0x990 drivers/tty/serial/rp2.c:\n493\nCo\n---truncated---",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "known_affected": [
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2021-47169"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/016002848c82eeb5d460489ce392d91fe18c475c",
          "url": "https://git.kernel.org/stable/c/016002848c82eeb5d460489ce392d91fe18c475c"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/1cc57cb32c84e059bd158494f746b665fc14d1b1",
          "url": "https://git.kernel.org/stable/c/1cc57cb32c84e059bd158494f746b665fc14d1b1"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/1e04d5d5fe5e76af68f834e1941fcbfa439653be",
          "url": "https://git.kernel.org/stable/c/1e04d5d5fe5e76af68f834e1941fcbfa439653be"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/35265552c7fe9553c75e324c80f45e28ff14eb6e",
          "url": "https://git.kernel.org/stable/c/35265552c7fe9553c75e324c80f45e28ff14eb6e"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/6a931ceb0b9401fe18d0c500e08164bf9cc7be4b",
          "url": "https://git.kernel.org/stable/c/6a931ceb0b9401fe18d0c500e08164bf9cc7be4b"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/915452f40e2f495e187276c4407a4f567ec2307e",
          "url": "https://git.kernel.org/stable/c/915452f40e2f495e187276c4407a4f567ec2307e"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/9b07b6973f7359e2dd6a9fe6db0c142634c823b7",
          "url": "https://git.kernel.org/stable/c/9b07b6973f7359e2dd6a9fe6db0c142634c823b7"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/c697244ce940ec07e2d745ccb63ca97fc0266fbc",
          "url": "https://git.kernel.org/stable/c/c697244ce940ec07e2d745ccb63ca97fc0266fbc"
        }
      ],
      "release_date": "2024-03-25T10:15:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-07-17T19:28:32.452534Z",
          "details": "This issue is confined to the rp2 driver for Comtrol RocketPort EXPRESS/INFINITY multiport serial adapters and requires that this specific PCI/PCIe hardware be present (or PCI‑passthrough) with its firmware missing, allowing a device interrupt to trigger a kernel NULL‑pointer dereference. It is a local, availability‑only fault (no confidentiality or integrity impact), and systems that do not load rp2 or do not attach this adapter—including cloud VMs that lack such PCIe passthrough—are not exposed. Given these constraints, it can be safely deprioritized in managed enterprise deployments.",
          "product_ids": [
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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      "threats": [
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          "category": "impact",
          "details": "Moderate"
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    }
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}