CVE-2021-45486: Infoleak
An information leak flaw was found in the Linux kernel’s IPv4 implementation in the iprtinit in net/ipv4/route.c function. The use of a small hash table in IP ID generation allows a remote attacker to reveal sensitive information.
Other sources
An information leak problem could be observed in iprtinit in net/ipv4/route.c in the IPv4 implementation. In this flaw, using a small hash table in IP ID generation could be abused by a patient remote attacker to reveal sensitive information.
Reference and upstream patch: https://arxiv.org/pdf/2112.09604.pdf https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/net/ipv4/route.c?id=aa6dd211e4b1dde9d5dc25d699d35f789ae7eeba
— Red Hat
In the IPv4 implementation in the Linux kernel before 5.12.4, net/ipv4/route.c has an information leak because the hash table is very small.
Affected Software
Remediation
Information
Patch Available
Event History
Parent advisories
This vulnerability appears in the following advisories.
Frequently Asked Questions
What is the severity of CVE-2021-45486?
CVE-2021-45486 has been assigned a medium severity rating due to its potential for information leakage.
How do I fix CVE-2021-45486?
To remediate CVE-2021-45486, users should update their Linux kernel to one of the patched versions specified by their distribution, such as kernel-rt version 0:4.18.0-372.9.1.rt7.166.el8 or similar.
Which systems are affected by CVE-2021-45486?
CVE-2021-45486 affects various Linux kernel versions, particularly those prior to 5.13 and specific Red Hat and Oracle distributions.
What types of information can be leaked due to CVE-2021-45486?
CVE-2021-45486 can potentially leak sensitive information due to compromised IP ID generation in the kernel's IPv4 implementation.
Is there a workaround for CVE-2021-45486?
Currently, the recommended action for CVE-2021-45486 is to apply the latest kernel updates, as there are no specified workarounds.