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CVE-2021-47600— dm btree remove: fix use after free in rebalance_children()

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dm btree remove rebalance_children()中存在释放后重用。

CVSS 7.8 · High EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< a48f6a2bf33734ec5669ee03067dfb6c5b4818d6 affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< 66ea642af6fd4eacb5d0271a922130fcf8700424 affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< b03abd0aa09c05099f537cb05b8460c4298f0861 affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< 293f957be5e39720778fb1851ced7f5fba6d51c3 affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< 501ecd90efdc9b2edc6c28852ecd098a4adf8f00 affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< 0e21e6cd5eebfc929ac5fa3b97ca2d4ace3cb6a3 affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< 607beb420b3fe23b948a9bf447d993521a02fbbb affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< 1b8d2789dad0005fd5e7d35dab26a8e1203fb6da affected
… +10 more rows
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I. Basic Information for CVE-2021-47600

Vulnerability Information
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Vulnerability Title
dm btree remove: fix use after free in rebalance_children()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm btree remove: fix use after free in rebalance_children() Move dm_tm_unlock() after dm_tm_dec().
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dm btree remove rebalance_children()中存在释放后重用。
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 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 ~ a48f6a2bf33734ec5669ee03067dfb6c5b4818d6 -
Linux Linux 3.2 -

II. Public POCs for CVE-2021-47600

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III. Intelligence Information for CVE-2021-47600

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Other References for CVE-2021-47600 (7)

Same Patch Batch · Linux · 2024-06-19 · 122 CVEs total

CVE-2024-38558 10.0 CRITICAL net: openvswitch: fix overwriting ct original tuple for ICMPv6
CVE-2024-38570 9.8 CRITICAL gfs2: Fix potential glock use-after-free on unmount
CVE-2021-47587 9.8 CRITICAL net: systemport: Add global locking for descriptor lifecycle
CVE-2024-38544 9.8 CRITICAL RDMA/rxe: Fix seg fault in rxe_comp_queue_pkt
CVE-2021-47611 8.1 HIGH mac80211: validate extended element ID is present
CVE-2024-38587 7.8 HIGH speakup: Fix sizeof() vs ARRAY_SIZE() bug
CVE-2024-38556 7.8 HIGH net/mlx5: Add a timeout to acquire the command queue semaphore
CVE-2024-38605 7.8 HIGH ALSA: core: Fix NULL module pointer assignment at card init
CVE-2024-38599 7.8 HIGH jffs2: prevent xattr node from overflowing the eraseblock
CVE-2024-38592 7.8 HIGH drm/mediatek: Init `ddp_comp` with devm_kcalloc()
CVE-2024-38588 7.8 HIGH ftrace: Fix possible use-after-free issue in ftrace_location()
CVE-2024-38564 7.8 HIGH bpf: Add BPF_PROG_TYPE_CGROUP_SKB attach type enforcement in BPF_LINK_CREATE
CVE-2024-38568 7.8 HIGH drivers/perf: hisi: hns3: Fix out-of-bound access when valid event group
CVE-2024-38572 7.8 HIGH wifi: ath12k: fix out-of-bound access of qmi_invoke_handler()
CVE-2024-38578 7.8 HIGH ecryptfs: Fix buffer size for tag 66 packet
CVE-2024-38569 7.8 HIGH drivers/perf: hisi_pcie: Fix out-of-bound access when valid event group
CVE-2024-38581 7.8 HIGH drm/amdgpu/mes: fix use-after-free issue
CVE-2024-38583 7.8 HIGH nilfs2: fix use-after-free of timer for log writer thread
CVE-2024-38614 7.8 HIGH openrisc: traps: Don't send signals to kernel mode threads
CVE-2024-38580 7.8 HIGH epoll: be better about file lifetimes

Showing top 20 of 122 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47600

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