CVE-2026-23377 ice: change XDP RxQ frag_size from DMA write length to xdp.frame_sz
A flaw in the Linux kernel ice driver allows attackers to trigger a kernel panic via specific XDP packet configurations, causing denial of service.
- 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-2026-23377?
CVE-2026-23377 is a medium-severity denial of service vulnerability in Linux kernel, published on 25 Mar 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:
ice: change XDP RxQ frag_size from DMA write length to xdp.frame_sz
The only user of frag_size field in XDP RxQ info is bpf_xdp_frags_increase_tail(). It clearly expects whole buff size instead of DMA write size. Different assumptions in ice driver configuration lead to negative tailroom.
This allows to trigger kernel panic, when using XDP_ADJUST_TAIL_GROW_MULTI_BUFF xskxceiver test and changing packet size to 6912 and the requested offset to a huge value, e.g. XSK_UMEM__MAX_FRAME_SIZE * 100.
Due to other quirks of the ZC configuration in ice, panic is not observed in ZC mode, but tailroom growing still fails when it should not.
Use fill queue buffer truesize instead of DMA write size in XDP RxQ info. Fix ZC mode too by using the new helper.
Which versions are affected by CVE-2026-23377?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23377?
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-2026-23377 being exploited?
There is no known exploitation of CVE-2026-23377 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-80577, BELL-CVE-2026-23377, DEBIAN-CVE-2026-23377, GHSA-r46f-q3f8-wrrg, ROOT-OS-DEBIAN-13-CVE-2026-23377, ROOT-OS-UBUNTU-2404-CVE-2026-23377 and 1 more.