CVE-2026-97954 net/rds: fix tcp stream corruption with large pages
An attacker can cause TCP stream corruption and potential denial of service in Linux RDS-TCP on systems with large page sizes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-97954?
CVE-2026-97954 is a denial of service vulnerability in Linux, published on 25 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net/rds: fix tcp stream corruption with large pages
rds_message_map_pages() assigns PAGE_SIZE bytes to every scatterlist entry, even when total_len ends in a partial page. The RDS congestion map is defined as 8192 bytes, so on systems with PAGE_SIZE greater than 8192 the scatterlist maps bytes beyond the end of the congestion map. RDS-TCP transmits the SG contents according to those lengths, so the extra bytes become part of the TCP RDS stream and are interpreted as subsequent RDS message headers, corrupting the stream.
Limit the final scatterlist mapping to the number of bytes remaining. This has no effect on systems with a 4K page size and allows RDS-TCP to be used on systems with 16K and larger page sizes.
The RDS selftest, which previously hung on 16K pages, now passes.
Which versions are affected by CVE-2026-97954?
How do I fix CVE-2026-97954?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-97954 being exploited?
There is no known exploitation of CVE-2026-97954 in the wild and no public exploit code.
Sources
Also known as AZL-104421, BELL-CVE-2026-97954, DEBIAN-CVE-2026-97954, GHSA-hh3g-f497-67jw, UBUNTU-CVE-2026-97954.