What’s Vulnerable › Vulnerabilities

CVE-2024-47668: lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-10-09 · updated 2026-08-04
• Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc() If we need to increase the tree depth, allocate a new node, and then race with another thread that increased the tree depth before us, we'll still have a preallocated node that might be used later. If we then use that node for a new non-root node, it'll still have a pointer to the old root instead of being zeroed - fix this by zeroing it in the cmpxchg failure path.

Affected products

• Linux kernel: before 5.4.284; from 5.5 before 5.10.226; from 5.11 before 5.15.167; from 5.16 before 6.1.110; from 6.2 before 6.6.51; from 6.7 before 6.10.10 — fixed in 5.10.226, 5.15.167, 5.4.284, 6.1.110, 6.10.10, 6.6.51

How to fix

Upgrade to a fixed version: Linux kernel 5.10.226, 5.15.167, 5.4.284, 6.1.110. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0f078f8ca93b28a34e20bd050f12cd4efeee7c0f
• https://git.kernel.org/stable/c/0f27f4f445390cb7f73d4209cb2bf32834dc53da
• https://git.kernel.org/stable/c/99418ec776a39609f50934720419e0b464ca2283
• https://git.kernel.org/stable/c/ad5ee9feebc2eb8cfc76ed74a2d6e55343b0e169
• https://git.kernel.org/stable/c/b2f11c6f3e1fc60742673b8675c95b78447f3dae
• https://git.kernel.org/stable/c/d942e855324a60107025c116245095632476613e
• https://git.kernel.org/stable/c/ebeff038744c498a036e7a92eb8e433ae0a386d7
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

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