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CVE-2024-40905

4.7 · MEDIUM
Published Jul 12, 2024 linux CWE-476 EPSS 0.27% (19th pctl)

Overview

CVE-2024-40905 is a medium-severity vulnerability affecting linux linux_kernel. 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 and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

Vendor Product Versions Status
linux linux_kernel >= 4.2, < 5.4.279 Affected

References

Ref git.kernel.org/stable/c/09e5a5a80e205922151136069e440477d6816914 Ref git.kernel.org/stable/c/2498960dac9b6fc49b6d1574f7cd1a4872744adf Ref git.kernel.org/stable/c/7e796c3fefa8b17b30e7252886ae8cffacd2b9ef Ref git.kernel.org/stable/c/a0bc020592b54a8f3fa2b7f244b6e39e526c2e12 Ref git.kernel.org/stable/c/b01e1c030770ff3b4fe37fc7cc6bca03f594133f Ref git.kernel.org/stable/c/c693698787660c97950bc1f93a8dd19d8307153d Ref git.kernel.org/stable/c/c90af1cced2f669a7b2304584be4ada495eaa0e5 Ref git.kernel.org/stable/c/09e5a5a80e205922151136069e440477d6816914 Ref git.kernel.org/stable/c/2498960dac9b6fc49b6d1574f7cd1a4872744adf Ref git.kernel.org/stable/c/7e796c3fefa8b17b30e7252886ae8cffacd2b9ef

Frequently Asked Questions

What is CVE-2024-40905?

CVE-2024-40905 is a medium-severity vulnerability affecting linux linux_kernel. 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 and patches from linux. Update linux_kernel to the latest patched version. 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's AI-powered security agents can automatically detect CVE-2024-40905 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

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