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CVE-2021-47356— mISDN: fix possible use-after-free in HFC_cleanup()

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: Moderate EPSS 0.27% · P18

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 87c5fa1bb42624254a2013cbbc3b170d6017f5d6< 49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe affected
87c5fa1bb42624254a2013cbbc3b170d6017f5d6< 54ff3202928952a100c477248e65ac6db01258a7 affected
87c5fa1bb42624254a2013cbbc3b170d6017f5d6< 7867ddc5f3de7f289aee63233afc0df4b62834c5 affected
87c5fa1bb42624254a2013cbbc3b170d6017f5d6< 5f2818185da0fe82a932f0856633038b66faf124 affected
87c5fa1bb42624254a2013cbbc3b170d6017f5d6< 3ecd228c636ee17c14662729737fa07242a93cb0 affected
87c5fa1bb42624254a2013cbbc3b170d6017f5d6< b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d affected
87c5fa1bb42624254a2013cbbc3b170d6017f5d6< 61370ff07e0acc657559a8fac02551dfeb9d3020 affected
87c5fa1bb42624254a2013cbbc3b170d6017f5d6< ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda affected
… +12 more rows
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I. Basic Information for CVE-2021-47356

Vulnerability Information
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Vulnerability Title
mISDN: fix possible use-after-free in HFC_cleanup()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mISDN: fix possible use-after-free in HFC_cleanup() This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.
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 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 ~ 49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2021-47356

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III. Intelligence Information for CVE-2021-47356

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Other References for CVE-2021-47356 (9)

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

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-2021-47328 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-2021-47378 9.8 CRITICAL nvme-rdma: destroy cm id before destroy qp to avoid use after free
CVE-2021-47232 9.8 CRITICAL can: j1939: fix Use-after-Free, hold skb ref while in use
CVE-2021-47427 9.8 CRITICAL scsi: iscsi: Fix iscsi_task use after free
CVE-2023-52846 8.8 HIGH hsr: Prevent use after free in prp_create_tagged_frame()
CVE-2023-52801 8.8 HIGH iommufd: Fix missing update of domains_itree after splitting iopt_area
CVE-2023-52798 8.8 HIGH wifi: ath11k: fix dfs radar event locking
CVE-2021-47388 8.8 HIGH mac80211: fix use-after-free in CCMP/GCMP RX
CVE-2021-47390 8.8 HIGH KVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect()
CVE-2023-52790 8.8 HIGH swiotlb: fix out-of-bounds TLB allocations with CONFIG_SWIOTLB_DYNAMIC
CVE-2023-52769 8.8 HIGH wifi: ath12k: fix htt mlo-offset event locking
CVE-2023-52776 8.8 HIGH wifi: ath12k: fix dfs-radar and temperature event locking
CVE-2021-47308 8.8 HIGH scsi: libfc: Fix array index out of bound exception
CVE-2021-47240 8.4 HIGH net: qrtr: fix OOB Read in qrtr_endpoint_post
CVE-2023-52829 8.4 HIGH wifi: ath12k: fix possible out-of-bound write in ath12k_wmi_ext_hal_reg_caps()
CVE-2021-47352 8.4 HIGH virtio-net: Add validation for used length
CVE-2021-47244 8.2 HIGH mptcp: Fix out of bounds when parsing TCP options

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-2021-47356

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