CVE-2025-21760: ndisc: extend RCU protection in ndisc_send_skb()
First published: Thu Feb 27 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ndisc: extend RCU protection in ndisc_send_skb() ndisc_send_skb() can be called without RTNL or RCU held. Acquire rcu_read_lock() earlier, so that we can use dev_net_rcu() and avoid a potential UAF.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=2.6.26<5.4.291 | |
| Linux Kernel | >=5.5<5.10.235 | |
| Linux Kernel | >=5.11<5.15.179 | |
| Linux Kernel | >=5.16<6.1.129 | |
| Linux Kernel | >=6.2<6.6.79 | |
| Linux Kernel | >=6.7<6.12.16 | |
| Linux Kernel | >=6.13<6.13.4 | |
| Linux Kernel | =6.14-rc1 | |
| Linux Kernel | =6.14-rc2 |
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Reference Links
- https://git.kernel.org/stable/c/04e05112f10354ffc3bb6cc796d553bab161594c
- https://git.kernel.org/stable/c/789230e5a8c1097301afc802e242c79bc8835c67
- https://git.kernel.org/stable/c/a9319d800b5701e7f5e3fa71a5b7c4831fc20d6d
- https://git.kernel.org/stable/c/ae38982f521621c216fc2f5182cd091f4734641d
- https://git.kernel.org/stable/c/ed6ae1f325d3c43966ec1b62ac1459e2b8e45640
- https://git.kernel.org/stable/c/10a1f3fece2f0d23a3a618b72b2b4e6f408ef7d1
- https://git.kernel.org/stable/c/4d576202b90b1b95a7c428a80b536f91b8201bcc
- https://git.kernel.org/stable/c/e24d225e4cb8cf108bde00b76594499b98f0a74d
Frequently Asked Questions
What is the severity of CVE-2025-21760?
CVE-2025-21760 has a severity rating that indicates it poses a potential risk of a use-after-free vulnerability in the Linux kernel.
How do I fix CVE-2025-21760?
To fix CVE-2025-21760, you should upgrade to the latest patched version of the Linux kernel that addresses this vulnerability.
What systems are affected by CVE-2025-21760?
CVE-2025-21760 affects systems running the Linux kernel, particularly versions prior to the fix release.
What type of vulnerability is CVE-2025-21760?
CVE-2025-21760 is classified as a use-after-free vulnerability that can lead to potential exploitation in the Linux kernel.
Is there a workaround for CVE-2025-21760?
Currently, there are no known workarounds for CVE-2025-21760, and the best course of action is to apply the kernel updates as they become available.
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