CVE-2025-21764 The advisory has been revoked - it doesn't affect any version of package kernel-rt-debug-modules (opens in a new tab)
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-ROCKY9-KERNELRTDEBUGMODULES-13615887
- published18 Oct 2025
- disclosed27 Feb 2025
Introduced: 27 Feb 2025
CVE-2025-21764 (opens in a new tab)Amendment
The Rocky-Linux security team deemed this advisory irrelevant for Rocky-Linux:9.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-modules package and not the kernel-rt-debug-modules package as distributed by Rocky-Linux.
In the Linux kernel, the following vulnerability has been resolved:
ndisc: use RCU protection in ndisc_alloc_skb()
ndisc_alloc_skb() can be called without RTNL or RCU being held.
Add RCU protection to avoid possible UAF.
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-21764
- https://git.kernel.org/stable/c/3c2d705f5adf5d860aaef90cb4211c0fde2ba66d
- https://git.kernel.org/stable/c/628e6d18930bbd21f2d4562228afe27694f66da9
- https://git.kernel.org/stable/c/96fc896d0e5b37c12808df797397fb16f3080879
- https://git.kernel.org/stable/c/9e0ec817eb41a55327a46cd3ce331a9868d60304
- https://git.kernel.org/stable/c/b870256dd2a5648d5ed2f22316b3ac29a7e5ed63
- https://git.kernel.org/stable/c/bbec88e4108e8d6fb468d3817fa652140a44ff28
- https://git.kernel.org/stable/c/c30893ef3d9cde8e7e8e4fd06b53d2c935bbccb1
- https://git.kernel.org/stable/c/cd1065f92eb7ff21b9ba5308a86f33d1670bf926
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html