# CVE-2024-56719

## Summary

- **CVE ID:** CVE-2024-56719
- **Severity:** CRITICAL
- **CVSS Score:** 10 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Dec 29, 2024
- **Last Modified:** Sep 8, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

net: stmmac: fix TSO DMA API usage causing oops

Commit 66600fac7a98 ("net: stmmac: TSO: Fix unbalanced DMA map/unmap
for non-paged SKB data") moved the assignment of tx_skbuff_dma[]'s
members to be later in stmmac_tso_xmit().

The buf (dma cookie) and len stored in this structure are passed to
dma_unmap_single() by stmmac_tx_clean(). The DMA API requires that
the dma cookie passed to dma_unmap_single() is the same as the value
returned from dma_map_single(). However, by moving the assignment
later, this is not the case when priv->dma_cap.addr64 > 32 as "des"
is offset by proto_hdr_len.

This causes problems such as:

  dwc-eth-dwmac 2490000.ethernet eth0: Tx DMA map failed

and with DMA_API_DEBUG enabled:

  DMA-API: dwc-eth-dwmac 2490000.ethernet: device driver tries to +free DMA memory it has not allocated [device address=0x000000ffffcf65c0] [size=66 bytes]

Fix this by maintaining "des" as the original DMA cookie, and use
tso_des to pass the offset DMA cookie to stmmac_tso_allocator().

Full details of the crashes can be found at:
https://lore.kernel.org/all/d8112193-0386-4e14-b516-37c2d838171a@nvidia.com/
https://lore.kernel.org/all/klkzp5yn5kq5efgtrow6wbvnc46bcqfxs65nz3qy77ujr5turc@bwwhelz2l4dw/

## Affected Products

- Linux — Linux (07c9c26e37542486e34d767505e842f48f29c3f6)
- Linux — Linux (66600fac7a984dea4ae095411f644770b2561ede)
- Linux — Linux (ece593fc9c00741b682869d3f3dc584d37b7c9df)
- Linux — Linux (a3ff23f7c3f0e13f718900803e090fd3997d6bc9)
- Linux — Linux (58d23d835eb498336716cca55b5714191a309286)
- Linux — Linux (6.12)
- Linux — Linux (0)
- Linux — Linux (6.6.68)
- Linux — Linux (6.12.7)
- Linux — Linux (6.13)
- Linux — Linux (6.1.167)
- Linux — Linux (6.1.116)
- Linux — Linux (6.6.60)
- Linux — Linux (5.15.171)
- Linux — Linux (6.11.7)
- Linux — Linux (5.15.209)

## References

- [CNA](https://git.kernel.org/stable/c/db3667c9bbfbbf5de98e6c9542f7e03fb5243286)
- [CNA](https://git.kernel.org/stable/c/9d5dd7ccea1b46a9a7c6b3c2b9e5ed8864e185e2)
- [CNA](https://git.kernel.org/stable/c/4c49f38e20a57f8abaebdf95b369295b153d1f8e)
- [CNA](https://git.kernel.org/stable/c/6abcdc9a73274052a9e96a1926994ecf9aedad82)
- [CNA](https://git.kernel.org/stable/c/05968b6dd0ffc65d7386608b11a11fb4fdfc9f36)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-082556.html)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-019113.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.50%
- **EPSS Percentile:** 41.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._