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CVE-2021-47060— KVM: Stop looking for coalesced MMIO zones if the bus is destroyed

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，该漏洞源于在合并 MMIO 的情况下，会导致已删除的列表条目取消引用。

CVSS 7.8 · High EPSS 0.24% · P14

Affected Version Matrix 23

VendorProduct Version RangeStatus
Linux Linux 41b2ea7a6a11e2b1a7f2c29e1675a709a6b2b98d< 7d1bc32d6477ff96a32695ea4be8144e4513ab2d affected
f65886606c2d3b562716de030706dfe1bea4ed5e< 2a20592baff59c5351c5200ec667e1a2aa22af85 affected
f65886606c2d3b562716de030706dfe1bea4ed5e< 168e82f640ed1891a700bdb43e37da354b2ab63c affected
f65886606c2d3b562716de030706dfe1bea4ed5e< 50cbad42bfea8c052b7ca590bd4126cdc898713c affected
f65886606c2d3b562716de030706dfe1bea4ed5e< 5d3c4c79384af06e3c8e25b7770b6247496b4417 affected
f0dfffce3f4ffd5f822568a4a6fb34c010e939d1 affected
840e124f89a5127e7eb97ebf377f4b8ca745c070 affected
40a023f681befd9b2862a3c16fb306a38b359ae5 affected
… +15 more rows
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I. Basic Information for CVE-2021-47060

Vulnerability Information
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Vulnerability Title
KVM: Stop looking for coalesced MMIO zones if the bus is destroyed
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: Stop looking for coalesced MMIO zones if the bus is destroyed Abort the walk of coalesced MMIO zones if kvm_io_bus_unregister_dev() fails to allocate memory for the new instance of the bus. If it can't instantiate a new bus, unregister_dev() destroys all devices _except_ the target device. But, it doesn't tell the caller that it obliterated the bus and invoked the destructor for all devices that were on the bus. In the coalesced MMIO case, this can result in a deleted list entry dereference due to attempting to continue iterating on coalesced_zones after future entries (in the walk) have been deleted. Opportunistically add curly braces to the for-loop, which encompasses many lines but sneaks by without braces due to the guts being a single if statement.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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，该漏洞源于在合并 MMIO 的情况下，会导致已删除的列表条目取消引用。
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 41b2ea7a6a11e2b1a7f2c29e1675a709a6b2b98d ~ 7d1bc32d6477ff96a32695ea4be8144e4513ab2d -
Linux Linux 5.9 -

II. Public POCs for CVE-2021-47060

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III. Intelligence Information for CVE-2021-47060

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Other References for CVE-2021-47060 (5)

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-2023-52486 7.8 HIGH drm: Don't unref the same fb many times by mistake due to deadlock handling
CVE-2024-26608 7.8 HIGH ksmbd: fix global oob in ksmbd_nl_policy
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-2023-52483 7.8 HIGH mctp: perform route lookups under a RCU read-side lock
CVE-2024-26617 7.8 HIGH fs/proc/task_mmu: move mmu notification mechanism inside mm lock
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-2021-47020 soundwire: stream: fix memory leak in stream config error path
CVE-2021-47056 crypto: qat - ADF_STATUS_PF_RUNNING should be set after adf_dev_init
CVE-2021-47057 crypto: sun8i-ss - Fix memory leak of object d when dma_iv fails to map

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-2021-47060

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