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CVE-2026-98131: net: stmmac: fix dma mapping leak in stmmac_tso_xmit()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-25 · updated 2026-10-21
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: net: stmmac: fix dma mapping leak in stmmac_tso_xmit() In stmmac_tso_xmit(), if the DMA mapping of an skb fragment fails, the frame is dropped but the DMA mappings already created for the linear part and for the fragments mapped before the failure are never unmapped, leaking DMA mappings. Fix the leak by walking back over the descriptors used by the frame and releasing each of them with stmmac_free_tx_buffer(). Moreover, release the descriptors with stmmac_release_tx_desc() unmapping the DMA buffers.

Affected products

• Linux kernel: from 4.7 before 7.2.7; 7.3-rc1 — fixed in 7.2.7

How to fix

Upgrade to a fixed version: Linux kernel 7.2.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/8a3257f142ae513d0c96d42f97386d4941bcec29
• https://git.kernel.org/stable/c/a5d946466a95621fa2769720d59ea336003aa1a5
• https://git.kernel.org/stable/c/c5449b635362cb678d29d8f6ab54e65734d891ce
• https://git.kernel.org/stable/c/e85adaac3dc6317cae902372c6849189ec62cf7d

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