Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2024-40905

4.7 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible race in __fib6_drop_pcpu_from() syzbot found a race in __fib6_drop_pcpu_from() [1] If compiler reads more t…

Published Jul 12, 2024CWE-476EPSS 0.27%

Overview

CVE-2024-40905 is a medium-severity vulnerability. It was published on July 12, 2024 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. 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 possible race in __fib6_drop_pcpu_from()

syzbot found a race in __fib6_drop_pcpu_from() [1]

If compiler reads more than once (*ppcpu_rt),

second read could read NULL, if another cpu clears

the value in rt6_get_pcpu_route().

Add a READ_ONCE() to prevent this race.

Also add rcu_read_lock()/rcu_read_unlock() because

we rely on RCU protection while dereferencing pcpu_rt.

[1]

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000012: 0000 [#1] PREEMPT SMP KASAN PTI

KASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097]

CPU: 0 PID: 7543 Comm: kworker/u8:17 Not tainted 6.10.0-rc1-syzkaller-00013-g2bfcfd584ff5 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024

Workqueue: netns cleanup_net

RIP: 0010:__fib6_drop_pcpu_from.part.0+0x10a/0x370 net/ipv6/ip6_fib.c:984

Code: f8 48 c1 e8 03 80 3c 28 00 0f 85 16 02 00 00 4d 8b 3f 4d 8

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/09e5a5a80e205922151136069e440477d6816914Refgit.kernel.org/stable/c/2498960dac9b6fc49b6d1574f7cd1a4872744adfRefgit.kernel.org/stable/c/7e796c3fefa8b17b30e7252886ae8cffacd2b9efRefgit.kernel.org/stable/c/a0bc020592b54a8f3fa2b7f244b6e39e526c2e12Refgit.kernel.org/stable/c/b01e1c030770ff3b4fe37fc7cc6bca03f594133fRefgit.kernel.org/stable/c/c693698787660c97950bc1f93a8dd19d8307153dRefgit.kernel.org/stable/c/c90af1cced2f669a7b2304584be4ada495eaa0e5Refgit.kernel.org/stable/c/09e5a5a80e205922151136069e440477d6816914Refgit.kernel.org/stable/c/2498960dac9b6fc49b6d1574f7cd1a4872744adfRefgit.kernel.org/stable/c/7e796c3fefa8b17b30e7252886ae8cffacd2b9ef

How CyberStrike helps

Frequently asked questions

What is CVE-2024-40905?

CVE-2024-40905 is a medium-severity vulnerability. It was published on July 12, 2024 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2024-40905?

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-40905?

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-2024-40905?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-40905 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.

Related MEDIUM CVEs from 2024

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999