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CVE-2021-47058— regmap: set debugfs_name to NULL after it is freed

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，该漏洞源于存在内存泄漏问题。

AI Predicted 3.3 Difficulty: Theoretical EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 17

VendorProduct Version RangeStatus
Linux Linux 5b654b03007917f3f1015b2a5c288c1ea6ae8f65< 2dc1554d5f0fdaf47cc5bea442b84b9226fea867 affected
480c5e9c7e4c76c01d5f1f7b73832d7b77e6b427< d8897f7b2283a500666c85ef06e820df38ed7b52 affected
c9698380b01aed3281160d3ab25749b57d6913b8< eb949f891226c012138ffd9df90d1e509f428ae6 affected
cffa4b2122f5f3e53cf3d529bbc74651f95856d5< c764e375ae647832de1ee73d43a4bb3ef8a8f43d affected
cffa4b2122f5f3e53cf3d529bbc74651f95856d5< b9e569ae1da3a113b3acee8703c94777fd20938a affected
cffa4b2122f5f3e53cf3d529bbc74651f95856d5< e41a962f82e7afb5b1ee644f48ad0b3aee656268 affected
4.19.168< 4.19.191 affected
5.4.90< 5.4.119 affected
… +9 more rows
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I. Basic Information for CVE-2021-47058

Vulnerability Information
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Vulnerability Title
regmap: set debugfs_name to NULL after it is freed
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: regmap: set debugfs_name to NULL after it is freed There is a upstream commit cffa4b2122f5("regmap:debugfs: Fix a memory leak when calling regmap_attach_dev") that adds a if condition when create name for debugfs_name. With below function invoking logical, debugfs_name is freed in regmap_debugfs_exit(), but it is not created again because of the if condition introduced by above commit. regmap_reinit_cache() regmap_debugfs_exit() ... regmap_debugfs_init() So, set debugfs_name to NULL after it is freed.
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，该漏洞源于存在内存泄漏问题。
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 5b654b03007917f3f1015b2a5c288c1ea6ae8f65 ~ 2dc1554d5f0fdaf47cc5bea442b84b9226fea867 -
Linux Linux 5.11 -

II. Public POCs for CVE-2021-47058

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III. Intelligence Information for CVE-2021-47058

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Other References for CVE-2021-47058 (6)

Same Patch Batch · Linux · 2024-02-29 · 53 CVEs total

CVE-2023-52480 9.8 CRITICAL ksmbd: fix race condition between session lookup and expire
CVE-2023-52478 8.8 HIGH HID: logitech-hidpp: Fix kernel crash on receiver USB disconnect
CVE-2023-52479 8.8 HIGH ksmbd: fix uaf in smb20_oplock_break_ack
CVE-2024-26620 8.2 HIGH s390/vfio-ap: always filter entire AP matrix
CVE-2021-47068 7.8 HIGH net/nfc: fix use-after-free llcp_sock_bind/connect
CVE-2023-52491 7.8 HIGH media: mtk-jpeg: Fix use after free bug due to error path handling in mtk_jpeg_dec_device_
CVE-2024-26608 7.8 HIGH ksmbd: fix global oob in ksmbd_nl_policy
CVE-2023-52486 7.8 HIGH drm: Don't unref the same fb many times by mistake due to deadlock handling
CVE-2024-26610 7.8 HIGH wifi: iwlwifi: fix a memory corruption
CVE-2024-26614 7.8 HIGH tcp: make sure init the accept_queue's spinlocks once
CVE-2024-26617 7.8 HIGH fs/proc/task_mmu: move mmu notification mechanism inside mm lock
CVE-2023-52483 7.8 HIGH mctp: perform route lookups under a RCU read-side lock
CVE-2021-47060 7.8 HIGH KVM: Stop looking for coalesced MMIO zones if the bus is destroyed
CVE-2021-47061 7.8 HIGH KVM: Destroy I/O bus devices on unregister failure _after_ sync'ing SRCU
CVE-2024-26611 7.5 HIGH xsk: fix usage of multi-buffer BPF helpers for ZC XDP
CVE-2021-47066 7.1 HIGH async_xor: increase src_offs when dropping destination page
CVE-2021-47055 7.1 HIGH mtd: require write permissions for locking and badblock ioctls
CVE-2023-52497 7.1 HIGH erofs: fix lz4 inplace decompression
CVE-2021-47057 crypto: sun8i-ss - Fix memory leak of object d when dma_iv fails to map
CVE-2021-47059 crypto: sun8i-ss - fix result memory leak on error path

Showing top 20 of 53 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47058

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