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CVE-2024-43835

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: virtio_net: Fix napi_skb_cache_put warning After the commit bdacf3e34945 ("net: Use nested-BH locking for napi_alloc_cache.") w…

Published Aug 17, 2024EPSS 0.25%

Overview

CVE-2024-43835 is a medium-severity vulnerability. It was published on August 17, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, 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:

virtio_net: Fix napi_skb_cache_put warning

After the commit bdacf3e34945 ("net: Use nested-BH locking for

napi_alloc_cache.") was merged, the following warning began to appear:

WARNING: CPU: 5 PID: 1 at net/core/skbuff.c:1451 napi_skb_cache_put+0x82/0x4b0

__warn+0x12f/0x340

napi_skb_cache_put+0x82/0x4b0

napi_skb_cache_put+0x82/0x4b0

report_bug+0x165/0x370

handle_bug+0x3d/0x80

exc_invalid_op+0x1a/0x50

asm_exc_invalid_op+0x1a/0x20

__free_old_xmit+0x1c8/0x510

napi_skb_cache_put+0x82/0x4b0

__free_old_xmit+0x1c8/0x510

__free_old_xmit+0x1c8/0x510

__pfx___free_old_xmit+0x10/0x10

The issue arises because virtio is assuming it's running in NAPI context

even when it's not, such as in the netpoll case.

To resolve this, modify virtnet_poll_tx() to only set NAPI when budget

is available. Same for virtnet_poll_cleantx(), which always assumed that

it was in a NAPI context.

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/468a729b78895893d0e580ceea49bed8ada2a2bdRefgit.kernel.org/stable/c/6b5325f2457521bbece29499970c0117a648c620Refgit.kernel.org/stable/c/842a97b5e44f0c8a9fc356fe976e0e13ddcf7783Refgit.kernel.org/stable/c/cc7340f18e45886121c131227985d64ef666012fRefgit.kernel.org/stable/c/d3af435e8ace119e58d8e21d3d2d6a4e7c4a4baaRefgit.kernel.org/stable/c/f5e9a22d19bb98a7e86034db85eb295e94187caaRefgit.kernel.org/stable/c/f8321fa75102246d7415a6af441872f6637c93abReflists.debian.org/debian-lts-announce/2024/10/msg00003.htmlReflists.debian.org/debian-lts-announce/2025/01/msg00001.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-43835?

CVE-2024-43835 is a medium-severity vulnerability. It was published on August 17, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-43835?

This vulnerability has a CVSS 3.1 base score of 5.5, 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-2024-43835?

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-2024-43835?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-43835 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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