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.

Classification

CVE ID: CVE-2024-47668

CVSS Base Severity: MEDIUM

CVSS Base Score: 4.7

CVSS Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.02% (probability of being exploited)

EPSS Percentile: 4.55% (scored less or equal to compared to others)

EPSS Date: 2025-06-02 (when was this score calculated)

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: none

SSVC Technical Impact: partial

SSVC Automatable: false

References

https://nvd.nist.gov/vuln/detail/CVE-2024-47668
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/ebeff038744c498a036e7a92eb8e433ae0a386d7
https://git.kernel.org/stable/c/d942e855324a60107025c116245095632476613e
https://git.kernel.org/stable/c/0f078f8ca93b28a34e20bd050f12cd4efeee7c0f
https://git.kernel.org/stable/c/b2f11c6f3e1fc60742673b8675c95b78447f3dae

Timeline