CVE-2022-49972: xsk: Fix corrupted packets for XDP_SHARED_UMEM

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-06-18 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: xsk: Fix corrupted packets for XDP_SHARED_UMEM Fix an issue in XDP_SHARED_UMEM mode together with aligned mode where packets are corrupted for the second and any further sockets bound to the same umem. In other words, this does not affect the first socket bound to the umem. The culprit for this bug is that the initialization of the DMA addresses for the pre-populated xsk buffer pool entries was not performed for any socket but the first one bound to the umem. Only the linear array of DMA addresses was populated. Fix this by populating the DMA addresses in the xsk buffer pool for every socket bound to the same umem.

Affected products

Linux kernel: from 5.16 before 5.19.8; 6.0-rc1, 6.0-rc2, 6.0-rc3 — fixed in 5.19.8

How to fix

Upgrade to a fixed version: Linux kernel 5.19.8. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2022-49972 or the next vulnerability affects your stack