CVE-2026-74622

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References