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CVE-2021-47055— mtd: require write permissions for locking and badblock ioctls

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，该漏洞源于权限管理不当。

CVSS 7.1 · High EPSS 0.20% · P9

Affected Version Matrix 29

VendorProduct Version RangeStatus
Linux Linux 1c9f9125892a43901438bf704ada6b7019e2a884< f4d28d8b9b0e7c4ae04214b8d7e0b0466ec6bcaf affected
583d42400532fbd6228b0254d7c732b771e4750d< 9625b00cac6630479c0ff4b9fafa88bee636e1f0 affected
389c74c218d3b182e9cd767e98cee0e0fd0dabaa< f73b29819c6314c0ba8b7d5892dfb03487424bee affected
ab1a602a9cea98aa37b2e6851b168d2a2633a58d< 75ed985bd6c8ac1d4e673e93ea9d96c9908c1d37 affected
9a53e8bd59d9f070505e51d3fd19606a270e6b93< 5880afefe0cb9b2d5e801816acd58bfe91a96981 affected
f7e6b19bc76471ba03725fe58e0c218a3d6266c3< 7b6552719c0ccbbea29dde4be141da54fdb5877e affected
f7e6b19bc76471ba03725fe58e0c218a3d6266c3< 077259f5e777c3c8821f6b41dee709fcda27306b affected
f7e6b19bc76471ba03725fe58e0c218a3d6266c3< a08799d3e8c8088640956237c183f83463c39668 affected
… +21 more rows
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I. Basic Information for CVE-2021-47055

Vulnerability Information
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Vulnerability Title
mtd: require write permissions for locking and badblock ioctls
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mtd: require write permissions for locking and badblock ioctls MEMLOCK, MEMUNLOCK and OTPLOCK modify protection bits. Thus require write permission. Depending on the hardware MEMLOCK might even be write-once, e.g. for SPI-NOR flashes with their WP# tied to GND. OTPLOCK is always write-once. MEMSETBADBLOCK modifies the bad block table.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
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，该漏洞源于权限管理不当。
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 1c9f9125892a43901438bf704ada6b7019e2a884 ~ f4d28d8b9b0e7c4ae04214b8d7e0b0466ec6bcaf -
Linux Linux 5.9 -

II. Public POCs for CVE-2021-47055

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III. Intelligence Information for CVE-2021-47055

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Other References for CVE-2021-47055 (8)

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

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-2021-47055

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