CVE-2021-47301: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: igb: Fix use-after-free error during reset Cleans the next descriptor to watch (next_to_watch) when cleaning the TX ring. Failure to do so can cause invalid memory accesses. If igb_poll() runs while the controller is reset this can lead to the driver try to free a skb that was already freed. (The crash is harder to reproduce with the igb driver, but the same potential problem exists as the code is identical to igc)

Affected products

• Linux Linux Kernel: from 4.12, before 4.14.241 (fixed in 4.14.241); from 4.15, before 4.19.199 (fixed in 4.19.199); from 4.20, before 5.4.136 (fixed in 5.4.136); from 5.5, before 5.10.54 (fixed in 5.10.54); from 5.11, before 5.13.6 (fixed in 5.13.6); version 5.14 only

Published 2024-05-21. Last modified 2026-06-17.