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CVE-2024-40954

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: do not leave a dangling sk pointer, when socket creation fails It is possible to trigger a use-after-free by: * attachin…

Published Jul 12, 2024CWE-416EPSS 0.26%

Overview

CVE-2024-40954 is a high-severity vulnerability. It was published on July 12, 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:

net: do not leave a dangling sk pointer, when socket creation fails

It is possible to trigger a use-after-free by:

* attaching an fentry probe to __sock_release() and the probe calling the

bpf_get_socket_cookie() helper

* running traceroute -I 1.1.1.1 on a freshly booted VM

A KASAN enabled kernel will log something like below (decoded and stripped):

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

BUG: KASAN: slab-use-after-free in __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)

Read of size 8 at addr ffff888007110dd8 by task traceroute/299

CPU: 2 PID: 299 Comm: traceroute Tainted: G E 6.10.0-rc2+ #2

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014

Call Trace:

<TASK>

dump_stack_lvl (lib/dump_st

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/454c454ed645fed051216b79622f7cb69c1638f5Refgit.kernel.org/stable/c/5dfe2408fd7dc4d2e7ac38a116ff0a37b1cfd3b9Refgit.kernel.org/stable/c/6cd4a78d962bebbaf8beb7d2ead3f34120e3f7b2Refgit.kernel.org/stable/c/78e4aa528a7b1204219d808310524344f627d069Refgit.kernel.org/stable/c/893eeba94c40d513cd0fe6539330ebdaea208c0eRefgit.kernel.org/stable/c/454c454ed645fed051216b79622f7cb69c1638f5Refgit.kernel.org/stable/c/5dfe2408fd7dc4d2e7ac38a116ff0a37b1cfd3b9Refgit.kernel.org/stable/c/6cd4a78d962bebbaf8beb7d2ead3f34120e3f7b2Refgit.kernel.org/stable/c/78e4aa528a7b1204219d808310524344f627d069Refgit.kernel.org/stable/c/893eeba94c40d513cd0fe6539330ebdaea208c0e

How CyberStrike helps

Frequently asked questions

What is CVE-2024-40954?

CVE-2024-40954 is a high-severity vulnerability. It was published on July 12, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-40954?

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-2024-40954?

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-2024-40954?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-40954 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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