CVE-2021-47291: Linux Kernel

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions While running the self-tests on a KASAN enabled kernel, I observed a slab-out-of-bounds splat very similar to the one reported in commit 821bbf79fe46 ("ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions"). We additionally need to take care of fib6_metrics initialization failure when the caller provides an nh. The fix is similar, explicitly free the route instead of calling fib6_info_release on a half-initialized object.

Affected products

• Linux Linux Kernel: from 5.3, 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 2026-08-04.