CVE-2026-64553 net: psample: fix info leak in PSAMPLE_ATTR_DATA
A local attacker can read uninitialized kernel memory via the psample netlink interface due to missing padding clearance.
- 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-2026-64553?
CVE-2026-64553 is a vulnerability in Linux, published on 27 Jul 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: psample: fix info leak in PSAMPLE_ATTR_DATA
psample open codes nla_put() presumably to avoid wiping the data with 0s just to override it with packet data. This open coding is missing clearing the pad, however, each netlink attr is padded to 4B and data_len may not be divisible by 4B.
Which versions are affected by CVE-2026-64553?
How do I fix CVE-2026-64553?
Apply the vendor's patch.
Is CVE-2026-64553 being exploited?
There is no known exploitation of CVE-2026-64553 in the wild and no public exploit code.
Sources
Also known as AZL-94038, BELL-CVE-2026-64553, DEBIAN-CVE-2026-64553, GHSA-mp9v-7pj9-m97x, UBUNTU-CVE-2026-64553.