CVE-2025-21635: rds: sysctl: rds_tcp_{rcv,snd}buf: avoid using current->nsproxy
First published: Sun Jan 19 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: rds: sysctl: rds_tcp_{rcv,snd}buf: avoid using current->nsproxy As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The per-netns structure can be obtained from the table->data using container_of(), then the 'net' one can be retrieved from the listen socket (if available).
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Red Hat Kernel-devel | ||
| Linux Kernel | >=4.6<6.12.10 | |
| Linux Kernel | =6.13-rc1 | |
| Linux Kernel | =6.13-rc2 | |
| Linux Kernel | =6.13-rc3 | |
| Linux Kernel | =6.13-rc4 | |
| Linux Kernel | =6.13-rc5 | |
| Linux Kernel | =6.13-rc6 | |
| debian/linux | <=5.10.223-1<=5.10.234-1<=6.1.129-1<=6.1.135-1 | 6.12.25-1 6.12.27-1 |
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Reference Links
- https://git.kernel.org/stable/c/de8d6de0ee27be4b2b1e5b06f04aeacbabbba492
- https://git.kernel.org/stable/c/7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-21635
- https://nvd.nist.gov/vuln/detail/CVE-2025-21635
- https://launchpad.net/bugs/cve/CVE-2025-21635
- https://security-tracker.debian.org/tracker/CVE-2025-21635
- https://ubuntu.com/security/CVE-2025-21635
- https://git.kernel.org/linus/7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c
Frequently Asked Questions
What is the severity of CVE-2025-21635?
The severity of CVE-2025-21635 is currently rated as moderate.
How do I fix CVE-2025-21635?
To fix CVE-2025-21635, update your Linux kernel to the latest patched version.
What are the potential impacts of CVE-2025-21635?
CVE-2025-21635 can lead to inconsistent behavior in RDS (Reliable Datagram Sockets) operations.
Is CVE-2025-21635 exploitable remotely?
CVE-2025-21635 is not considered to have remote exploit capabilities.
Which version of the Linux kernel is affected by CVE-2025-21635?
The vulnerability affects certain versions of the Linux kernel that utilize the RDS protocol.
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