CVE-2026-23384 RDMA/ionic: Fix kernel stack leak in ionic_create_cq()
A kernel stack leak in the RDMA ionic driver allows local attackers to read uninitialized kernel memory, potentially exposing sensitive data.
- 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-2026-23384?
CVE-2026-23384 is a medium-severity 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:
RDMA/ionic: Fix kernel stack leak in ionic_create_cq()
struct ionic_cq_resp resp { __u32 cqid[2]; // offset 0 - PARTIALLY SET (see below) __u8 udma_mask; // offset 8 - SET (resp.udma_mask = vcq->udma_mask) __u8 rsvd[7]; // offset 9 - NEVER SET <- LEAK };
rsvd[7]: 7 bytes of stack memory leaked unconditionally.
cqid[2]: The loop at line 1256 iterates over udma_idx but skips indices where !(vcq->udma_mask & BIT(udma_idx)). The array has 2 entries but udma_count could be 1, meaning cqid[1] might never be written via ionic_create_cq_common(). If udma_mask only has bit 0 set, cqid[1] (4 bytes) is also leaked. So potentially 11 bytes leaked.
Weakness: CWE-401
Which versions are affected by CVE-2026-23384?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23384?
Apply the vendor's patch.
Is CVE-2026-23384 being exploited?
There is no known exploitation of CVE-2026-23384 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-23384, DEBIAN-CVE-2026-23384, GHSA-6pc7-mm64-g3v9, UBUNTU-CVE-2026-23384.