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CVE-2021-47126

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions Reported by syzbot: HEAD commit: 90c911ad Merge tag 'fi…

Published Mar 15, 2024CWE-125EPSS 0.25%

Overview

CVE-2021-47126 is a high-severity vulnerability. It was published on March 15, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions

Reported by syzbot:

HEAD commit: 90c911ad Merge tag 'fixes' of git://git.kernel.org/pub/scm..

git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

dashboard link: https://syzkaller.appspot.com/bug?extid=123aa35098fd3c000eb7

compiler: Debian clang version 11.0.1-2

==================================================================

BUG: KASAN: slab-out-of-bounds in fib6_nh_get_excptn_bucket net/ipv6/route.c:1604 [inline]

BUG: KASAN: slab-out-of-bounds in fib6_nh_flush_exceptions+0xbd/0x360 net/ipv6/route.c:1732

Read of size 8 at addr ffff8880145c78f8 by task syz-executor.4/17760

CPU: 0 PID: 17760 Comm: syz-executor.4 Not tainted 5.12.0-rc8-syzkaller #0

Call Trace:

<IRQ>

__dump_stack lib/dump_stack.c:79 [inline]

dump_stack+0x202/0x31e lib/dump_stack.c:120

print_address_description+0x5f/0x3b0 mm/kasan/rep

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/09870235827451409ff546b073d754a19fd17e2eRefgit.kernel.org/stable/c/0a462e25ef0f7ab305081a08d435bbd1f13c0a94Refgit.kernel.org/stable/c/7ba7fa78a92dc410b6f93ed73075ab669c3a0b59Refgit.kernel.org/stable/c/821bbf79fe46a8b1d18aa456e8ed0a3c208c3754Refgit.kernel.org/stable/c/09870235827451409ff546b073d754a19fd17e2eRefgit.kernel.org/stable/c/0a462e25ef0f7ab305081a08d435bbd1f13c0a94Refgit.kernel.org/stable/c/7ba7fa78a92dc410b6f93ed73075ab669c3a0b59Refgit.kernel.org/stable/c/821bbf79fe46a8b1d18aa456e8ed0a3c208c3754

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47126?

CVE-2021-47126 is a high-severity vulnerability. It was published on March 15, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47126?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47126?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47126?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47126 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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