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CVE-2021-47361— mcb: fix error handling in mcb_alloc_bus()

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，该漏洞源于内存释放后重用。

AI Predicted 5.5 Difficulty: Hard EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 18d28819809909c3f24bb72183a901c5e332a63d< 8a558261fa57a6deefb0925ab1829f698b194aea affected
18d28819809909c3f24bb72183a901c5e332a63d< 115b07d9f47e3996430b8f2007edd9768e1f807f affected
18d28819809909c3f24bb72183a901c5e332a63d< 66f74ba9be9daf9c47fface6af3677f602774f6b affected
18d28819809909c3f24bb72183a901c5e332a63d< 7751f609eadf36b1f53712bae430019c53a16eb0 affected
18d28819809909c3f24bb72183a901c5e332a63d< 91e4ad05bf18322b5921d1a6c9b603f6eb1694f0 affected
18d28819809909c3f24bb72183a901c5e332a63d< 9fc198f415dee070a1de957bb5bf5921d8df3499 affected
18d28819809909c3f24bb72183a901c5e332a63d< 25a1433216489de4abc889910f744e952cb6dbae affected
4.7 affected
… +8 more rows
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I. Basic Information for CVE-2021-47361

Vulnerability Information
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Vulnerability Title
mcb: fix error handling in mcb_alloc_bus()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mcb: fix error handling in mcb_alloc_bus() There are two bugs: 1) If ida_simple_get() fails then this code calls put_device(carrier) but we haven't yet called get_device(carrier) and probably that leads to a use after free. 2) After device_initialize() then we need to use put_device() to release the bus. This will free the internal resources tied to the device and call mcb_free_bus() which will free the rest.
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，该漏洞源于内存释放后重用。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 18d28819809909c3f24bb72183a901c5e332a63d ~ 8a558261fa57a6deefb0925ab1829f698b194aea -
Linux Linux 4.7 -

II. Public POCs for CVE-2021-47361

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III. Intelligence Information for CVE-2021-47361

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Other References for CVE-2021-47361 (7)

Same Patch Batch · Linux · 2024-05-21 · 361 CVEs total

CVE-2021-47328 9.8 CRITICAL scsi: iscsi: Fix conn use after free during resets
CVE-2023-52741 9.8 CRITICAL cifs: Fix use-after-free in rdata->read_into_pages()
CVE-2023-52732 9.8 CRITICAL ceph: blocklist the kclient when receiving corrupted snap trace
CVE-2023-52755 9.8 CRITICAL ksmbd: fix slab out of bounds write in smb_inherit_dacl()
CVE-2021-47232 9.8 CRITICAL can: j1939: fix Use-after-Free, hold skb ref while in use
CVE-2021-47378 9.8 CRITICAL nvme-rdma: destroy cm id before destroy qp to avoid use after free
CVE-2021-47427 9.8 CRITICAL scsi: iscsi: Fix iscsi_task use after free
CVE-2023-52776 8.8 HIGH wifi: ath12k: fix dfs-radar and temperature event locking
CVE-2023-52846 8.8 HIGH hsr: Prevent use after free in prp_create_tagged_frame()
CVE-2021-47390 8.8 HIGH KVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect()
CVE-2021-47388 8.8 HIGH mac80211: fix use-after-free in CCMP/GCMP RX
CVE-2021-47308 8.8 HIGH scsi: libfc: Fix array index out of bound exception
CVE-2023-52801 8.8 HIGH iommufd: Fix missing update of domains_itree after splitting iopt_area
CVE-2023-52769 8.8 HIGH wifi: ath12k: fix htt mlo-offset event locking
CVE-2023-52798 8.8 HIGH wifi: ath11k: fix dfs radar event locking
CVE-2023-52790 8.8 HIGH swiotlb: fix out-of-bounds TLB allocations with CONFIG_SWIOTLB_DYNAMIC
CVE-2023-52829 8.4 HIGH wifi: ath12k: fix possible out-of-bound write in ath12k_wmi_ext_hal_reg_caps()
CVE-2021-47240 8.4 HIGH net: qrtr: fix OOB Read in qrtr_endpoint_post
CVE-2021-47352 8.4 HIGH virtio-net: Add validation for used length
CVE-2023-52775 8.2 HIGH net/smc: avoid data corruption caused by decline

Showing top 20 of 361 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47361

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