CVE-2021-47027— mt76: mt7921: fix kernel crash when the firmware fails to download
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，该漏洞源于固件下载失败时会导致内核崩溃。
Possible ATT&CK Techniques 2 AI
T1496 · Resource Hijacking T1059 · Command and Scripting InterpreterAffected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 5c14a5f944b91371961548b1907802f74a4d2e5c< a46b536cd60c0dbd4bf767c62a8774dec52bf099 |
affected |
5c14a5f944b91371961548b1907802f74a4d2e5c< e230f0c44f011f3270680a506b19b7e84c5e8923 |
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-2021-47027
Vulnerability Information
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Vulnerability Title
mt76: mt7921: fix kernel crash when the firmware fails to download
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mt76: mt7921: fix kernel crash when the firmware fails to download
Fix kernel crash when the firmware is missing or fails to download.
[ 9.444758] kernel BUG at drivers/pci/msi.c:375!
[ 9.449363] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[ 9.501033] pstate: a0400009 (NzCv daif +PAN -UAO)
[ 9.505814] pc : free_msi_irqs+0x180/0x184
[ 9.509897] lr : free_msi_irqs+0x40/0x184
[ 9.513893] sp : ffffffc015193870
[ 9.517194] x29: ffffffc015193870 x28: 00000000f0e94fa2
[ 9.522492] x27: 0000000000000acd x26: 000000000000009a
[ 9.527790] x25: ffffffc0152cee58 x24: ffffffdbb383e0d8
[ 9.533087] x23: ffffffdbb38628d0 x22: 0000000000040200
[ 9.538384] x21: ffffff8cf7de7318 x20: ffffff8cd65a2480
[ 9.543681] x19: ffffff8cf7de7000 x18: 0000000000000000
[ 9.548979] x17: ffffff8cf9ca03b4 x16: ffffffdc13ad9a34
[ 9.554277] x15: 0000000000000000 x14: 0000000000080800
[ 9.559575] x13: ffffff8cd65a2980 x12: 0000000000000000
[ 9.564873] x11: ffffff8cfa45d820 x10: ffffff8cfa45d6d0
[ 9.570171] x9 : 0000000000000040 x8 : ffffff8ccef1b780
[ 9.575469] x7 : aaaaaaaaaaaaaaaa x6 : 0000000000000000
[ 9.580766] x5 : ffffffdc13824900 x4 : ffffff8ccefe0000
[ 9.586063] x3 : 0000000000000000 x2 : 0000000000000000
[ 9.591362] x1 : 0000000000000125 x0 : ffffff8ccefe0000
[ 9.596660] Call trace:
[ 9.599095] free_msi_irqs+0x180/0x184
[ 9.602831] pci_disable_msi+0x100/0x130
[ 9.606740] pci_free_irq_vectors+0x24/0x30
[ 9.610915] mt7921_pci_probe+0xbc/0x250 [mt7921e]
[ 9.615693] pci_device_probe+0xd4/0x14c
[ 9.619604] really_probe+0x134/0x2ec
[ 9.623252] driver_probe_device+0x64/0xfc
[ 9.627335] device_driver_attach+0x4c/0x6c
[ 9.631506] __driver_attach+0xac/0xc0
[ 9.635243] bus_for_each_dev+0x8c/0xd4
[ 9.639066] driver_attach+0x2c/0x38
[ 9.642628] bus_add_driver+0xfc/0x1d0
[ 9.646365] driver_register+0x64/0xf8
[ 9.650101] __pci_register_driver+0x6c/0x7c
[ 9.654360] init_module+0x28/0xfdc [mt7921e]
[ 9.658704] do_one_initcall+0x13c/0x2d0
[ 9.662615] do_init_module+0x58/0x1e8
[ 9.666351] load_module+0xd80/0xeb4
[ 9.669912] __arm64_sys_finit_module+0xa8/0xe0
[ 9.674430] el0_svc_common+0xa4/0x16c
[ 9.678168] el0_svc_compat_handler+0x2c/0x40
[ 9.682511] el0_svc_compat+0x8/0x10
[ 9.686076] Code: a94257f6 f9400bf7 a8c47bfd d65f03c0 (d4210000)
[ 9.692155] ---[ end trace 7621f966afbf0a29 ]---
[ 9.697385] Kernel panic - not syncing: Fatal exception
[ 9.702599] SMP: stopping secondary CPUs
[ 9.706549] Kernel Offset: 0x1c03600000 from 0xffffffc010000000
[ 9.712456] PHYS_OFFSET: 0xfffffff440000000
[ 9.716625] CPU features: 0x080026,2a80aa18
[ 9.720795] Memory Limit: none
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，该漏洞源于固件下载失败时会导致内核崩溃。
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-2021-47027
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2021-47027 (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 → →
IV. Related Vulnerabilities
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Same vendor: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
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veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
V. Comments for CVE-2021-47027
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