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CVE-2025-21635: rds: sysctl: rds_tcp_{rcv,snd}buf: avoid using current->nsproxy

mediumCVSS 5.5CVE-2025-21635

CSIRTS triage

vendor: Linuxproduct: Linux KernelOther
What
The RDS sysctl interface for rds_tcp_{rcv,snd}buf incorrectly uses current->nsproxy, leading to a use-after-free or similar issue.
Who is affected
Systems running affected Linux kernel versions with RDS (Reliable Datagram Sockets) networking subsystem.
Urgency
Medium severity (CVSS 5.5) and not currently exploited; apply standard patching schedule.
Action
Apply kernel patch or update to a kernel version containing the fix for CVE-2025-21635.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21635

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-21635coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for rds

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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