What’s Vulnerable › Vulnerabilities

CVE-2026-43210: tracing: ring-buffer: Fix to check event length before using

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-06 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: tracing: ring-buffer: Fix to check event length before using Check the event length before adding it for accessing next index in rb_read_data_buffer(). Since this function is used for validating possibly broken ring buffers, the length of the event could be broken. In that case, the new event (e + len) can point a wrong address. To avoid invalid memory access at boot, check whether the length of each event is in the possible range before using it.

Affected products

• Linux kernel: from 6.12 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6 — fixed in 6.12.75, 6.18.16, 6.19.6

How to fix

Upgrade to a fixed version: Linux kernel 6.12.75, 6.18.16, 6.19.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/5026010110a5ad2268d8c23e1e286ab7c736f7ac
• https://git.kernel.org/stable/c/912b0ee248c529a4f45d1e7f568dc1adddbf2a4a
• https://git.kernel.org/stable/c/9eb80e54494ef1efef8a64bec4ffa672c9cf411e
• https://git.kernel.org/stable/c/b4700c089a10f89de3a5149d57f8a58306458982

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