CVE-2021-45486: Infoleak
First published: Wed Mar 24 2021(Updated: )
An information leak flaw was found in the Linux kernel’s IPv4 implementation in the ip_rt_init 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.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-372.9.1.rt7.166.el8 | 0:4.18.0-372.9.1.rt7.166.el8 |
| redhat/kernel | <0:4.18.0-372.9.1.el8 | 0:4.18.0-372.9.1.el8 |
| redhat/kernel-rt | <0:4.18.0-305.65.1.rt7.137.el8_4 | 0:4.18.0-305.65.1.rt7.137.el8_4 |
| redhat/kernel | <0:4.18.0-305.65.1.el8_4 | 0:4.18.0-305.65.1.el8_4 |
| redhat/kernel | <5.13 | 5.13 |
| Linux Kernel | <5.12.4 | |
| oracle communications Cloud native core binding support function | =22.1.3 | |
| oracle communications cloud native core network exposure function | =22.1.1 | |
| oracle communications Cloud native core policy | =22.2.0 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.13-1 |
Remedy
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-45486 https://nvd.nist.gov/vuln/detail/CVE-2021-45486 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
- https://bugzilla.redhat.com/show_bug.cgi?id=2039914
- https://access.redhat.com/errata/RHSA-2022:1975
- https://access.redhat.com/errata/RHSA-2022:1988
- https://access.redhat.com/errata/RHSA-2022:6991
- https://access.redhat.com/errata/RHSA-2022:6983
- https://access.redhat.com/security/cve/cve-2021-45486
- https://arxiv.org/pdf/2112.09604.pdf
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.4
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/net/ipv4/route.c?id=aa6dd211e4b1dde9d5dc25d699d35f789ae7eeba
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://launchpad.net/bugs/cve/CVE-2021-45486
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2039915
- https://git.kernel.org/linus/aa6dd211e4b1dde9d5dc25d699d35f789ae7eeba
- https://security-tracker.debian.org/tracker/CVE-2021-45486
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-45486
- https://nvd.nist.gov/vuln/detail/CVE-2021-45486
- https://ubuntu.com/security/CVE-2021-45486
Parent vulnerabilities
(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.
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