CVE-2026-46053 net: rds: fix MR cleanup on copy error
A use-after-free vulnerability in the Linux kernel's RDS module allows local attackers to execute arbitrary code or escalate privileges via a copy error path.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46053?
CVE-2026-46053 is a high-severity use after free vulnerability in Linux kernel, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: rds: fix MR cleanup on copy error
__rds_rdma_map() hands sg/pages ownership to the transport after get_mr() succeeds. If copying the generated cookie back to user space fails after that point, the error path must not free those resources again before dropping the MR reference.
Remove the duplicate unpin/free from the put_user() failure branch so that MR teardown is handled only through the existing final cleanup path.
Which versions are affected by CVE-2026-46053?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46053?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-46053 being exploited?
There is no known exploitation of CVE-2026-46053 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88737, BELL-CVE-2026-46053, DEBIAN-CVE-2026-46053, GHSA-p6f8-fpcw-hg3g, ROOT-OS-DEBIAN-11-CVE-2026-46053, ROOT-OS-DEBIAN-12-CVE-2026-46053 and 3 more.