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CVE-2021-47334— misc/libmasm/module: Fix two use after free in ibmasm_init_one

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 7.8 Difficulty: Moderate EPSS 0.28% · P20

Affected Version Matrix 20

VendorProductVersion RangeStatus
LinuxLinux736ce43295682d060f2b93624b4a339f9af6aab1< 1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069affected
736ce43295682d060f2b93624b4a339f9af6aab1< 29ba8e2ba89ee2862a26d91204dd5fe77ceee25aaffected
736ce43295682d060f2b93624b4a339f9af6aab1< 5b06ca113bf197aab2ab61288f42506e0049fbabaffected
736ce43295682d060f2b93624b4a339f9af6aab1< 481a76d4749ee3a27f902ba213fdcbb4bb39720eaffected
736ce43295682d060f2b93624b4a339f9af6aab1< 38660031e80eaa6cc9370b031c180612f414b00daffected
736ce43295682d060f2b93624b4a339f9af6aab1< b9c87ce3bc6331f82811a8cf8e930423c22523a3affected
736ce43295682d060f2b93624b4a339f9af6aab1< ef1067d2baa847d53c9988510d99fb494de4d12caffected
736ce43295682d060f2b93624b4a339f9af6aab1< a7268e8a227d5a4f0bd1584f556246b0224ab274affected
… +12 more rows
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I. Basic Information for CVE-2021-47334

Vulnerability Information
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Vulnerability Title
misc/libmasm/module: Fix two use after free in ibmasm_init_one
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: misc/libmasm/module: Fix two use after free in ibmasm_init_one In ibmasm_init_one, it calls ibmasm_init_remote_input_dev(). Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are allocated by input_allocate_device(), and assigned to sp->remote.mouse_dev and sp->remote.keybd_dev respectively. In the err_free_devices error branch of ibmasm_init_one, mouse_dev and keybd_dev are freed by input_free_device(), and return error. Then the execution runs into error_send_message error branch of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev. My patch add a "error_init_remote" label to handle the error of ibmasm_init_remote_input_dev(), to avoid the uaf bugs.
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 736ce43295682d060f2b93624b4a339f9af6aab1 ~ 1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069 -
LinuxLinux 2.6.16 -

II. Public POCs for CVE-2021-47334

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III. Intelligence Information for CVE-2021-47334

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Other References for CVE-2021-47334 (8)

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

CVE-2023-527329.8 CRITICALceph: blocklist the kclient when receiving corrupted snap trace
CVE-2023-527559.8 CRITICALksmbd: fix slab out of bounds write in smb_inherit_dacl()
CVE-2021-473289.8 CRITICALscsi: iscsi: Fix conn use after free during resets
CVE-2023-527419.8 CRITICALcifs: Fix use-after-free in rdata->read_into_pages()
CVE-2021-473789.8 CRITICALnvme-rdma: destroy cm id before destroy qp to avoid use after free
CVE-2021-472329.8 CRITICALcan: j1939: fix Use-after-Free, hold skb ref while in use
CVE-2021-474279.8 CRITICALscsi: iscsi: Fix iscsi_task use after free
CVE-2023-528468.8 HIGHhsr: Prevent use after free in prp_create_tagged_frame()
CVE-2023-528018.8 HIGHiommufd: Fix missing update of domains_itree after splitting iopt_area
CVE-2023-527988.8 HIGHwifi: ath11k: fix dfs radar event locking
CVE-2021-473888.8 HIGHmac80211: fix use-after-free in CCMP/GCMP RX
CVE-2021-473908.8 HIGHKVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect()
CVE-2023-527908.8 HIGHswiotlb: fix out-of-bounds TLB allocations with CONFIG_SWIOTLB_DYNAMIC
CVE-2023-527698.8 HIGHwifi: ath12k: fix htt mlo-offset event locking
CVE-2023-527768.8 HIGHwifi: ath12k: fix dfs-radar and temperature event locking
CVE-2021-473088.8 HIGHscsi: libfc: Fix array index out of bound exception
CVE-2023-528298.4 HIGHwifi: ath12k: fix possible out-of-bound write in ath12k_wmi_ext_hal_reg_caps()
CVE-2021-472408.4 HIGHnet: qrtr: fix OOB Read in qrtr_endpoint_post
CVE-2021-473528.4 HIGHvirtio-net: Add validation for used length
CVE-2021-472448.2 HIGHmptcp: 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-2021-47334

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