IT

Tracker / CVE-2022-49339

CVE-2022-49339

Medium 5.5

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: unexport __init-annotated seg6_hmac_init() EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic. modpost used to detect it, but it has been broken for a decade. Recently, I fixed modpost so it started to warn it again, then this showed up in linux-next builds. There are two ways to fix it: - Remove __init - Remove EXPORT_SYMBOL I chose the latter for this case because the caller (net/ipv6/seg6.c) and the callee (net/ipv6/seg6_hmac.c) belong to the same module. It seems an internal function call in ipv6.ko.

Affected products and versions

linux linux_kernel
linux linux_kernel · 4.10 → 4.14.283
linux linux_kernel · 4.15 → 4.19.247
linux linux_kernel · 4.20 → 5.4.198
linux linux_kernel · 5.11 → 5.15.47
linux linux_kernel · 5.16 → 5.17.15
linux linux_kernel · 5.18 → 5.18.4
linux linux_kernel · 5.5 → 5.10.122

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References