CVE-2021-47169— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于使用 request_firmware 而不是 request_firmware_nowait，可能会导致NULL 指针取消引用。
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 7d9f49afa451d8565d00a5cea39acf9bb26feb50< 1e04d5d5fe5e76af68f834e1941fcbfa439653be |
affected |
7d9f49afa451d8565d00a5cea39acf9bb26feb50< c697244ce940ec07e2d745ccb63ca97fc0266fbc |
affected | ||
7d9f49afa451d8565d00a5cea39acf9bb26feb50< 1cc57cb32c84e059bd158494f746b665fc14d1b1 |
affected | ||
7d9f49afa451d8565d00a5cea39acf9bb26feb50< 35265552c7fe9553c75e324c80f45e28ff14eb6e |
affected | ||
7d9f49afa451d8565d00a5cea39acf9bb26feb50< 915452f40e2f495e187276c4407a4f567ec2307e |
affected | ||
7d9f49afa451d8565d00a5cea39acf9bb26feb50< 6a931ceb0b9401fe18d0c500e08164bf9cc7be4b |
affected | ||
7d9f49afa451d8565d00a5cea39acf9bb26feb50< 9b07b6973f7359e2dd6a9fe6db0c142634c823b7 |
affected | ||
7d9f49afa451d8565d00a5cea39acf9bb26feb50< 016002848c82eeb5d460489ce392d91fe18c475c |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2021-47169 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
serial: rp2: use 'request_firmware' instead of 'request_firmware_nowait'
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
serial: rp2: use 'request_firmware' instead of 'request_firmware_nowait'
In 'rp2_probe', the driver registers 'rp2_uart_interrupt' then calls
'rp2_fw_cb' through 'request_firmware_nowait'. In 'rp2_fw_cb', if the
firmware don't exists, function just return without initializing ports
of 'rp2_card'. But now the interrupt handler function has been
registered, and when an interrupt comes, 'rp2_uart_interrupt' may access
those ports then causing NULL pointer dereference or other bugs.
Because the driver does some initialization work in 'rp2_fw_cb', in
order to make the driver ready to handle interrupts, 'request_firmware'
should be used instead of asynchronous 'request_firmware_nowait'.
This report reveals it:
INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.19.177-gdba4159c14ef-dirty #45
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-
gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xec/0x156 lib/dump_stack.c:118
assign_lock_key kernel/locking/lockdep.c:727 [inline]
register_lock_class+0x14e5/0x1ba0 kernel/locking/lockdep.c:753
__lock_acquire+0x187/0x3750 kernel/locking/lockdep.c:3303
lock_acquire+0x124/0x340 kernel/locking/lockdep.c:3907
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x32/0x50 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
rp2_ch_interrupt drivers/tty/serial/rp2.c:466 [inline]
rp2_asic_interrupt.isra.9+0x15d/0x990 drivers/tty/serial/rp2.c:493
rp2_uart_interrupt+0x49/0xe0 drivers/tty/serial/rp2.c:504
__handle_irq_event_percpu+0xfb/0x770 kernel/irq/handle.c:149
handle_irq_event_percpu+0x79/0x150 kernel/irq/handle.c:189
handle_irq_event+0xac/0x140 kernel/irq/handle.c:206
handle_fasteoi_irq+0x232/0x5c0 kernel/irq/chip.c:725
generic_handle_irq_desc include/linux/irqdesc.h:155 [inline]
handle_irq+0x230/0x3a0 arch/x86/kernel/irq_64.c:87
do_IRQ+0xa7/0x1e0 arch/x86/kernel/irq.c:247
common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:670
</IRQ>
RIP: 0010:native_safe_halt+0x28/0x30 arch/x86/include/asm/irqflags.h:61
Code: 00 00 55 be 04 00 00 00 48 c7 c7 00 c2 2f 8c 48 89 e5 e8 fb 31 e7 f8
8b 05 75 af 8d 03 85 c0 7e 07 0f 00 2d 8a 61 65 00 fb f4 <5d> c3 90 90 90
90 90 90 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41
RSP: 0018:ffff88806b71fcc8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffde
RAX: 0000000000000000 RBX: ffffffff8bde7e48 RCX: ffffffff88a21285
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff8c2fc200
RBP: ffff88806b71fcc8 R08: fffffbfff185f840 R09: fffffbfff185f840
R10: 0000000000000001 R11: fffffbfff185f840 R12: 0000000000000002
R13: ffffffff8bea18a0 R14: 0000000000000000 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0x6f/0x360 arch/x86/kernel/process.c:557
arch_cpu_idle+0xf/0x20 arch/x86/kernel/process.c:548
default_idle_call+0x3b/0x60 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x2ab/0x3c0 kernel/sched/idle.c:263
cpu_startup_entry+0xcb/0xe0 kernel/sched/idle.c:369
start_secondary+0x3b8/0x4e0 arch/x86/kernel/smpboot.c:271
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
PGD 8000000056d27067 P4D 8000000056d27067 PUD 56d28067 PMD 0
Oops: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.19.177-gdba4159c14ef-dirty #45
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-
gc9ba5276e321-prebuilt.qemu.org 04/01/2014
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:rp2_ch_interrupt drivers/tty/serial/rp2.c:472 [inline]
RIP: 0010:rp2_asic_interrupt.isra.9+0x181/0x990 drivers/tty/serial/rp2.c:
493
Co
---truncated---
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于使用 request_firmware 而不是 request_firmware_nowait，可能会导致NULL 指针取消引用。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2021-47169 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2021-47169 其他参考 (7)
同批安全公告 · Linux · 2024-03-25 · 共 40 条
| CVE-2021-47137 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47168 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47162 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47136 | 8.6 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47160 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47142 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47175 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47163 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47159 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47158 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47153 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47152 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47148 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47179 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47178 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47166 | Linux kernel 安全漏洞 | |
| CVE-2021-47180 | Linux kernel 安全漏洞 | |
| CVE-2021-47177 | Linux kernel 安全漏洞 | |
| CVE-2021-47176 | Linux kernel 安全漏洞 | |
| CVE-2021-47141 | Linux kernel 安全漏洞 |
显示前 20 条，共 40 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2021-47169
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