CVE-2025-39963 Affecting kernel6.12-libbpf-static package, versions <1:6.12.53-69.119.amzn2023
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-AMZN2023-KERNEL612LIBBPFSTATIC-13731557
- published29 Oct 2025
- disclosed9 Oct 2025
Introduced: 9 Oct 2025
NewCVE-2025-39963 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 kernel6.12-libbpf-static to version 1:6.12.53-69.119.amzn2023 or higher.
This issue was patched in ALAS2023-2025-1254.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel6.12-libbpf-static package and not the kernel6.12-libbpf-static package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
io_uring: fix incorrect io_kiocb reference in io_link_skb
In io_link_skb function, there is a bug where prev_notif is incorrectly assigned using 'nd' instead of 'prev_nd'. This causes the context validation check to compare the current notification with itself instead of comparing it with the previous notification.
Fix by using the correct prev_nd parameter when obtaining prev_notif.