CVE-2026-74622 net: atlantic: free RX pages of consumed but not refilled buffers
A memory leak in the Atlantic network driver allows attackers to cause denial of service by exhausting kernel memory through interface resets.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74622?
CVE-2026-74622 is a memory corruption 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:
net: atlantic: free RX pages of consumed but not refilled buffers
aq_ring_rx_deinit() only walks [sw_head, sw_tail), the region posted to hardware. Since the page reuse strategy was added, a cleaned RX buffer keeps its page (and its DMA mapping) in the ring for reuse, and refill is batched: aq_ring_rx_fill() returns early until AQ_CFG_RX_REFILL_THRES slots are free. Slots that were consumed but not yet reposted therefore sit in the complementary [sw_tail, sw_head) gap with a live page, and the deinit walk never visits them: up to a refill batch worth of pages and DMA mappings leak on every interface down.
Walk the whole ring instead and release whatever is still there. Also bail out if the buffer ring is already gone: a partial aq_ptp_ring_alloc() failure frees the ring but leaves aq_nic set, so aq_ptp_ring_deinit() still gets here on the unwind path.
Which versions are affected by CVE-2026-74622?
How do I fix CVE-2026-74622?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-74622 being exploited?
There is no known exploitation of CVE-2026-74622 in the wild and no public exploit code.
Sources
Also known as AZL-97068, BELL-CVE-2026-74622, DEBIAN-CVE-2026-74622, GHSA-897x-r623-rfvq, UBUNTU-CVE-2026-74622.