What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-06-19 · updated 2026-08-04
• Weakness: CWE-416

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().

Affected products

• Linux kernel: before 4.4.296; from 4.5 before 4.9.294; from 4.10 before 4.14.259; from 4.15 before 4.19.222; from 4.20 before 5.4.168; from 5.5 before 5.10.88 — fixed in 4.14.259, 4.19.222, 4.4.296, 4.9.294, 5.10.88, 5.15.11

How to fix

Upgrade to a fixed version: Linux kernel 4.14.259, 4.19.222, 4.4.296, 4.9.294. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0e21e6cd5eebfc929ac5fa3b97ca2d4ace3cb6a3
• https://git.kernel.org/stable/c/1b8d2789dad0005fd5e7d35dab26a8e1203fb6da
• https://git.kernel.org/stable/c/293f957be5e39720778fb1851ced7f5fba6d51c3
• https://git.kernel.org/stable/c/501ecd90efdc9b2edc6c28852ecd098a4adf8f00
• https://git.kernel.org/stable/c/607beb420b3fe23b948a9bf447d993521a02fbbb
• https://git.kernel.org/stable/c/66ea642af6fd4eacb5d0271a922130fcf8700424
• https://git.kernel.org/stable/c/a48f6a2bf33734ec5669ee03067dfb6c5b4818d6
• https://git.kernel.org/stable/c/b03abd0aa09c05099f537cb05b8460c4298f0861
• https://git.kernel.org/stable/c/0e21e6cd5eebfc929ac5fa3b97ca2d4ace3cb6a3
• https://git.kernel.org/stable/c/1b8d2789dad0005fd5e7d35dab26a8e1203fb6da
• https://git.kernel.org/stable/c/293f957be5e39720778fb1851ced7f5fba6d51c3
• https://git.kernel.org/stable/c/501ecd90efdc9b2edc6c28852ecd098a4adf8f00

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