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CVE-2026-43224: io_uring/zcrx: fix sgtable leak on mapping failures

• 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: 2026-05-06 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/zcrx: fix sgtable leak on mapping failures In an unlikely case when io_populate_area_dma() fails, which could only happen on a PAGE_POOL_32BIT_ARCH_WITH_64BIT_DMA machine, io_zcrx_map_area() will have an initialised and not freed table. It was supposed to be cleaned up in the error path, but !is_mapped prevents that.

Affected products

• Linux kernel: from 6.18 before 6.18.16; from 6.19 before 6.19.6 — fixed in 6.18.16, 6.19.6

How to fix

Upgrade to a fixed version: Linux kernel 6.18.16, 6.19.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/a983aae397767e9da931128ff2b5bf9066513ce3
• https://git.kernel.org/stable/c/ef075c1464ac9047e2cf7d23cb020bfd0b8e4b60
• https://git.kernel.org/stable/c/f1ae403324311e143ef20e53cf9a5f01e312f7c9

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