CVE-2024-41070— 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，该漏洞源于在kvm_spapr_tce_attach_iommu_group函数中，存在释放后重用问题。
影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 121f80ba68f1a5779a36d7b3247206e60e0a7418< be847bb20c809de8ac124431b556f244400b0491 |
affected |
121f80ba68f1a5779a36d7b3247206e60e0a7418< 4cdf6926f443c84f680213c7aafbe6f91a5fcbc0 |
affected | ||
121f80ba68f1a5779a36d7b3247206e60e0a7418< b26c8c85463ef27a522d24fcd05651f0bb039e47 |
affected | ||
121f80ba68f1a5779a36d7b3247206e60e0a7418< 5f856023971f97fff74cfaf21b48ec320147b50a |
affected | ||
121f80ba68f1a5779a36d7b3247206e60e0a7418< 82c7a4cf14aa866f8f7f09e662b02eddc49ee0bf |
affected | ||
121f80ba68f1a5779a36d7b3247206e60e0a7418< 9975f93c760a32453d7639cf6fcf3f73b4e71ffe |
affected | ||
121f80ba68f1a5779a36d7b3247206e60e0a7418< a986fa57fd81a1430e00b3c6cf8a325d6f894a63 |
affected | ||
4.12 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2024-41070 基础信息
漏洞信息
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Vulnerability Title
KVM: PPC: Book3S HV: Prevent UAF in kvm_spapr_tce_attach_iommu_group()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
KVM: PPC: Book3S HV: Prevent UAF in kvm_spapr_tce_attach_iommu_group()
Al reported a possible use-after-free (UAF) in kvm_spapr_tce_attach_iommu_group().
It looks up `stt` from tablefd, but then continues to use it after doing
fdput() on the returned fd. After the fdput() the tablefd is free to be
closed by another thread. The close calls kvm_spapr_tce_release() and
then release_spapr_tce_table() (via call_rcu()) which frees `stt`.
Although there are calls to rcu_read_lock() in
kvm_spapr_tce_attach_iommu_group() they are not sufficient to prevent
the UAF, because `stt` is used outside the locked regions.
With an artifcial delay after the fdput() and a userspace program which
triggers the race, KASAN detects the UAF:
BUG: KASAN: slab-use-after-free in kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm]
Read of size 4 at addr c000200027552c30 by task kvm-vfio/2505
CPU: 54 PID: 2505 Comm: kvm-vfio Not tainted 6.10.0-rc3-next-20240612-dirty #1
Hardware name: 8335-GTH POWER9 0x4e1202 opal:skiboot-v6.5.3-35-g1851b2a06 PowerNV
Call Trace:
dump_stack_lvl+0xb4/0x108 (unreliable)
print_report+0x2b4/0x6ec
kasan_report+0x118/0x2b0
__asan_load4+0xb8/0xd0
kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm]
kvm_vfio_set_attr+0x524/0xac0 [kvm]
kvm_device_ioctl+0x144/0x240 [kvm]
sys_ioctl+0x62c/0x1810
system_call_exception+0x190/0x440
system_call_vectored_common+0x15c/0x2ec
...
Freed by task 0:
...
kfree+0xec/0x3e0
release_spapr_tce_table+0xd4/0x11c [kvm]
rcu_core+0x568/0x16a0
handle_softirqs+0x23c/0x920
do_softirq_own_stack+0x6c/0x90
do_softirq_own_stack+0x58/0x90
__irq_exit_rcu+0x218/0x2d0
irq_exit+0x30/0x80
arch_local_irq_restore+0x128/0x230
arch_local_irq_enable+0x1c/0x30
cpuidle_enter_state+0x134/0x5cc
cpuidle_enter+0x6c/0xb0
call_cpuidle+0x7c/0x100
do_idle+0x394/0x410
cpu_startup_entry+0x60/0x70
start_secondary+0x3fc/0x410
start_secondary_prolog+0x10/0x14
Fix it by delaying the fdput() until `stt` is no longer in use, which
is effectively the entire function. To keep the patch minimal add a call
to fdput() at each of the existing return paths. Future work can convert
the function to goto or __cleanup style cleanup.
With the fix in place the test case no longer triggers the UAF.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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，该漏洞源于在kvm_spapr_tce_attach_iommu_group函数中，存在释放后重用问题。
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-2024-41070 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-41070 其他参考 (7)
同批安全公告 · Linux · 2024-07-29 · 共 121 条
| CVE-2024-41040 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-41073 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-41081 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-41091 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41090 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41062 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41046 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42083 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42064 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41069 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41041 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41045 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41049 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42066 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41051 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41064 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41059 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42075 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-41060 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42072 | 7.8 HIGH | Linux kernel 安全漏洞 |
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IV. Related Vulnerabilities
V. Comments for CVE-2024-41070
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