CVE-2026-43210
CVE-2026-43210 is a medium-severity vulnerability in Linux Linux Kernel with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: Medium (CVSS 3.x base score 5.5)
- EPSS exploit prediction: 0% (3rd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-27769
- Affected product: Linux Linux Kernel
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-43210?
- 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.
- How severe is CVE-2026-43210?
- CVE-2026-43210 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2026-43210 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-43210?
- CVE-2026-43210 affects Linux Linux Kernel. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-43210?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-43210 have an EU (EUVD) identifier?
- Yes. CVE-2026-43210 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27769.
- When was CVE-2026-43210 published?
- CVE-2026-43210 was published on 2026-05-06 and last updated on 2026-06-17.
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
Affected products (1)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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