CVE-2026-43345 net: ipa: fix event ring index not programmed for IPA v5.0+
A missing register configuration in the Linux kernel IPA driver causes system hangs during suspend or stop operations, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43345?
CVE-2026-43345 is a high-severity denial of service vulnerability in Linux kernel, published on 8 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: ipa: fix event ring index not programmed for IPA v5.0+
For IPA v5.0+, the event ring index field moved from CH_C_CNTXT_0 to CH_C_CNTXT_1. The v5.0 register definition intended to define this field in the CH_C_CNTXT_1 fmask array but used the old identifier of ERINDEX instead of CH_ERINDEX.
Without a valid event ring, GSI channels could never signal transfer completions. This caused gsi_channel_trans_quiesce() to block forever in wait_for_completion().
At least for IPA v5.2 this resolves an issue seen where runtime suspend, system suspend, and remoteproc stop all hanged forever. It also meant the IPA data path was completely non functional.
Which versions are affected by CVE-2026-43345?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43345?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-43345 being exploited?
There is no known exploitation of CVE-2026-43345 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43345, DEBIAN-CVE-2026-43345, GHSA-7657-q549-6g59, ROOT-OS-UBUNTU-2404-CVE-2026-43345, UBUNTU-CVE-2026-43345.