CVE-2021-47025— iommu/mediatek: Always enable the clk on resume
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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 mtk_iommu_runtime_resume 中始终启用 clk，即使 m4u_dom 为 null。
Possible ATT&CK Techniques 1 AI
T1068 · Exploitation for Privilege EscalationAffected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | c0b57581b73be7b43f39e0dff201c93413f6a668< 5cad9e2caa9613fdcd246bd4ebf0ffbec1cba2ca |
affected |
c0b57581b73be7b43f39e0dff201c93413f6a668< b34ea31fe013569d42b7e8681ef3f717f77c5b72 |
affected | ||
5.12 |
affected | ||
< 5.12 |
unaffected | ||
5.12.4≤ 5.12.* |
unaffected | ||
5.13≤ * |
unaffected |
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I. Basic Information for CVE-2021-47025
Vulnerability Information
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Vulnerability Title
iommu/mediatek: Always enable the clk on resume
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
iommu/mediatek: Always enable the clk on resume
In mtk_iommu_runtime_resume always enable the clk, even
if m4u_dom is null. Otherwise the 'suspend' cb might
disable the clk which is already disabled causing the warning:
[ 1.586104] infra_m4u already disabled
[ 1.586133] WARNING: CPU: 0 PID: 121 at drivers/clk/clk.c:952 clk_core_disable+0xb0/0xb8
[ 1.594391] mtk-iommu 10205000.iommu: bound 18001000.larb (ops mtk_smi_larb_component_ops)
[ 1.598108] Modules linked in:
[ 1.598114] CPU: 0 PID: 121 Comm: kworker/0:2 Not tainted 5.12.0-rc5 #69
[ 1.609246] mtk-iommu 10205000.iommu: bound 14027000.larb (ops mtk_smi_larb_component_ops)
[ 1.617487] Hardware name: Google Elm (DT)
[ 1.617491] Workqueue: pm pm_runtime_work
[ 1.620545] mtk-iommu 10205000.iommu: bound 19001000.larb (ops mtk_smi_larb_component_ops)
[ 1.627229] pstate: 60000085 (nZCv daIf -PAN -UAO -TCO BTYPE=--)
[ 1.659297] pc : clk_core_disable+0xb0/0xb8
[ 1.663475] lr : clk_core_disable+0xb0/0xb8
[ 1.667652] sp : ffff800011b9bbe0
[ 1.670959] x29: ffff800011b9bbe0 x28: 0000000000000000
[ 1.676267] x27: ffff800011448000 x26: ffff8000100cfd98
[ 1.681574] x25: ffff800011b9bd48 x24: 0000000000000000
[ 1.686882] x23: 0000000000000000 x22: ffff8000106fad90
[ 1.692189] x21: 000000000000000a x20: ffff0000c0048500
[ 1.697496] x19: ffff0000c0048500 x18: ffffffffffffffff
[ 1.702804] x17: 0000000000000000 x16: 0000000000000000
[ 1.708112] x15: ffff800011460300 x14: fffffffffffe0000
[ 1.713420] x13: ffff8000114602d8 x12: 0720072007200720
[ 1.718727] x11: 0720072007200720 x10: 0720072007200720
[ 1.724035] x9 : ffff800011b9bbe0 x8 : ffff800011b9bbe0
[ 1.729342] x7 : 0000000000000009 x6 : ffff8000114b8328
[ 1.734649] x5 : 0000000000000000 x4 : 0000000000000000
[ 1.739956] x3 : 00000000ffffffff x2 : ffff800011460298
[ 1.745263] x1 : 1af1d7de276f4500 x0 : 0000000000000000
[ 1.750572] Call trace:
[ 1.753010] clk_core_disable+0xb0/0xb8
[ 1.756840] clk_core_disable_lock+0x24/0x40
[ 1.761105] clk_disable+0x20/0x30
[ 1.764501] mtk_iommu_runtime_suspend+0x88/0xa8
[ 1.769114] pm_generic_runtime_suspend+0x2c/0x48
[ 1.773815] __rpm_callback+0xe0/0x178
[ 1.777559] rpm_callback+0x24/0x88
[ 1.781041] rpm_suspend+0xdc/0x470
[ 1.784523] rpm_idle+0x12c/0x170
[ 1.787831] pm_runtime_work+0xa8/0xc0
[ 1.791573] process_one_work+0x1e8/0x360
[ 1.795580] worker_thread+0x44/0x478
[ 1.799237] kthread+0x150/0x158
[ 1.802460] ret_from_fork+0x10/0x30
[ 1.806034] ---[ end trace 82402920ef64573b ]---
[ 1.810728] ------------[ cut here ]------------
In addition, we now don't need to enable the clock from the
function mtk_iommu_hw_init since it is already enabled by the resume.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
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 mtk_iommu_runtime_resume 中始终启用 clk，即使 m4u_dom 为 null。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-47025
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2021-47025 (2)
Same Patch Batch · Linux · 2024-02-28 · 86 CVEs total
| CVE-2021-47036 | 9.8 CRITICAL | udp: skip L4 aggregation for UDP tunnel packets |
| CVE-2021-47013 | 9.8 CRITICAL | net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send |
| CVE-2021-46999 | 9.8 CRITICAL | sctp: do asoc update earlier in sctp_sf_do_dupcook_a |
| CVE-2021-47035 | 8.8 HIGH | iommu/vt-d: Remove WO permissions on second-level paging entries |
| CVE-2021-47017 | 8.8 HIGH | ath10k: Fix a use after free in ath10k_htc_send_bundle |
| CVE-2021-47049 | 8.4 HIGH | Drivers: hv: vmbus: Use after free in __vmbus_open() |
| CVE-2021-46977 | 7.8 HIGH | KVM: VMX: Disable preemption when probing user return MSRs |
| CVE-2021-47040 | 7.8 HIGH | io_uring: fix overflows checks in provide buffers |
| CVE-2020-36785 | 7.8 HIGH | media: atomisp: Fix use after free in atomisp_alloc_css_stat_bufs() |
| CVE-2021-46993 | 7.8 HIGH | sched: Fix out-of-bound access in uclamp |
| CVE-2021-47014 | 7.8 HIGH | net/sched: act_ct: fix wild memory access when clearing fragments |
| CVE-2020-36787 | 7.8 HIGH | media: aspeed: fix clock handling logic |
| CVE-2021-46998 | 7.8 HIGH | ethernet:enic: Fix a use after free bug in enic_hard_start_xmit |
| CVE-2021-47011 | 7.8 HIGH | mm: memcontrol: slab: fix obtain a reference to a freeing memcg |
| CVE-2021-46992 | 7.8 HIGH | netfilter: nftables: avoid overflows in nft_hash_buckets() |
| CVE-2021-46984 | 7.8 HIGH | kyber: fix out of bounds access when preempted |
| CVE-2021-47012 | 7.8 HIGH | RDMA/siw: Fix a use after free in siw_alloc_mr |
| CVE-2021-47048 | 7.8 HIGH | spi: spi-zynqmp-gqspi: fix use-after-free in zynqmp_qspi_exec_op |
| CVE-2021-47001 | 7.5 HIGH | xprtrdma: Fix cwnd update ordering |
| CVE-2021-46983 | 7.5 HIGH | nvmet-rdma: Fix NULL deref when SEND is completed with error |
Showing top 20 of 86 CVEs. View all on vendor page → →
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V. Comments for CVE-2021-47025
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