CVE-2026-74603 ptp: ocp: Fix board ID over-read
A local attacker can read out-of-bounds memory from the kernel by exploiting a missing NUL terminator in the PTP OCP board ID field.
- 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-2026-74603?
CVE-2026-74603 is a high-severity vulnerability in Linux, published on 22 Aug 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:
ptp: ocp: Fix board ID over-read
The EEPROM board ID is a fixed 13-byte field and is not guaranteed to contain a NUL terminator. Passing it directly to devlink_info_version_fixed_put() treats it as a C string and may read beyond the field.
Format at most OCP_BOARD_ID_LEN bytes into the existing local buffer before reporting the ID. Use a precision limit because the snprintf() output size alone does not bound the source string scan.
Which versions are affected by CVE-2026-74603?
How do I fix CVE-2026-74603?
Apply the vendor's patch.
Is CVE-2026-74603 being exploited?
There is no known exploitation of CVE-2026-74603 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74603, DEBIAN-CVE-2026-74603, GHSA-9xcf-hcjx-rjfr, UBUNTU-CVE-2026-74603.