CVE-2025-71306 ima: Fix stack-out-of-bounds in is_bprm_creds_for_exec()
A stack-out-of-bounds read in the Linux kernel IMA subsystem can cause a system crash when executing binaries.
- 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-2025-71306?
CVE-2025-71306 is a high-severity memory corruption 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:
ima: Fix stack-out-of-bounds in is_bprm_creds_for_exec()
KASAN reported a stack-out-of-bounds access in ima_appraise_measurement from is_bprm_creds_for_exec:
BUG: KASAN: stack-out-of-bounds in ima_appraise_measurement+0x12dc/0x16a0 Read of size 1 at addr ffffc9000160f940 by task sudo/550 The buggy address belongs to stack of task sudo/550 and is located at offset 24 in frame: ima_appraise_measurement+0x0/0x16a0 This frame has 2 objects: [48, 56) 'file' [80, 148) 'hash'
This is caused by using container_of on the *file pointer. This offset calculation is what triggers the stack-out-of-bounds error.
In order to fix this, pass in a bprm_is_check boolean which can be set depending on how process_measurement is called. If the caller has a linux_binprm pointer and the function is BPRM_CHECK we can determine is_check and set it then. Otherwise set it to false.
Weakness: CWE-125
Which versions are affected by CVE-2025-71306?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-71306?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-71306 being exploited?
There is no known exploitation of CVE-2025-71306 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-71306, DEBIAN-CVE-2025-71306, GHSA-cw2f-qvgg-223g, UBUNTU-CVE-2025-71306.