CVE-2026-74563: rds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check()

highCVSS 7CVE-2026-74563

CSIRTS triage

vendor: Linux product: Linux kernel Denial of service

What: RDS TCP code does not hold RCU lock across ipv6_chk_addr() call, causing use-after-free or crash.
Who is affected: Systems running Linux kernel with RDS TCP transport enabled.
Urgency: High priority; causes kernel crash and denial of service, affects system stability.
Action: Apply kernel patch to hold RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check().

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Linux kernel

Get an email when a new Linux kernel advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74563

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.

Low exploitation riskCVE-2026-745630.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74563	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highCVE-2026-74563: In the Linux kernel, the following vulnerability has been resolved: rds: tcp: hold the RCU loc…nvd

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.

highCVE-2026-74563: In the Linux kernel, the following vulnerability has been resolved: rds: tcp: hold the RCU loc…nvd · 2026-08-15
highCVE-2026-68335: rds: drop incoming messages that cross network namespace boundariesmsrc · 2026-08-11
mediumCVE-2026-68322: rds: Fix inet6_addr_lst NULL dereference when IPv6 is disabledmsrc · 2026-08-11
highCVE-2026-68335: In the Linux kernel, the following vulnerability has been resolved: rds: drop incoming message…nvd · 2026-08-10
unknownCVE-2026-68322: In the Linux kernel, the following vulnerability has been resolved: rds: Fix inet6_addr_lst NU…nvd · 2026-08-10
highCVE-2026-68290: In the Linux kernel, the following vulnerability has been resolved: rds: tcp: unregister sysct…nvd · 2026-08-10