CVE-2024-43835

virtio_net: Fix napi_skb_cache_put warning

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.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.07%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/19ac6f29bf64304ef04630c8ab56ecd2059d7aa1	patch
https://git.kernel.org/stable/c/d3af435e8ace119e58d8e21d3d2d6a4e7c4a4baa	patch
https://git.kernel.org/stable/c/842a97b5e44f0c8a9fc356fe976e0e13ddcf7783	patch
https://git.kernel.org/stable/c/cc7340f18e45886121c131227985d64ef666012f	patch
https://git.kernel.org/stable/c/6b5325f2457521bbece29499970c0117a648c620	patch
https://git.kernel.org/stable/c/f5e9a22d19bb98a7e86034db85eb295e94187caa	patch
https://git.kernel.org/stable/c/468a729b78895893d0e580ceea49bed8ada2a2bd	patch
https://git.kernel.org/stable/c/f8321fa75102246d7415a6af441872f6637c93ab	patch

Frequently Asked Questions

What is the severity of CVE-2024-43835?: CVE-2024-43835 has been scored as a medium severity vulnerability.
How to fix CVE-2024-43835?: To fix CVE-2024-43835, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-43835 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-43835 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-43835?: CVE-2024-43835 affects Linux Linux, Linux Linux.