CVE-2026-43346

In the Linux kernel, the following vulnerability has been resolved:

ice: ptp: dont WARN when controlling PF is unavailable

In VFIO passthrough setups, it is possible to pass through only a PF which doesnt own the source timer. In that case the PTP controlling PF (adapter->ctrl_pf) is never initialized in the VM, so ice_get_ctrl_ptp() returns NULL and triggers WARN_ON() in ice_ptp_setup_pf().

Since this is an expected behavior in that configuration, replace WARN_ON() with an informational message and return -EOPNOTSUPP.

Weakness

The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Affected Software

Extended Description

While assertion is good for catching logic errors and reducing the chances of reaching more serious vulnerability conditions, it can still lead to a denial of service. For example, if a server handles multiple simultaneous connections, and an assert() occurs in one single connection that causes all other connections to be dropped, this is a reachable assertion that leads to a denial of service.

Potential Mitigations

References

• https://git.kernel.org/stable/c/bb3f21edc7056cdf44a7f7bd7ba65af40741838c
• https://git.kernel.org/stable/c/c73f365707d3b1b78b7d16e1f029020d1ae50d0f
• https://git.kernel.org/stable/c/e19675b384e9dcaca1bd5e4a67b8ad136eccfbe8