CVE-2025-21635

Summary

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).

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/7f5611cbc4871c7fb1ad36c2e5a9edad63dca95cPatch
• https://git.kernel.org/stable/c/de8d6de0ee27be4b2b1e5b06f04aeacbabbba492Patch
• https://git.kernel.org/stable/c/33b3e09a489a31b30342b77cc55290f025d95c7e
• https://git.kernel.org/stable/c/6f353c2230c199f343406c08482940ec5d8ba89c