CVE-2024-43835

virtio_net: Fix napi_skb_cache_put warning

State: Published
Severity: Not scored
Published: Aug 17, 2024
Updated: May 11, 2026
Reserved: Aug 17, 2024

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	df133f3f96257ee29696c0ed8bd198ec801dc810 to before d3af435e8ace119e58d8e21d3d2d6a4e7c4a4baaAffected df133f3f96257ee29696c0ed8bd198ec801dc810 to before 842a97b5e44f0c8a9fc356fe976e0e13ddcf7783Affected df133f3f96257ee29696c0ed8bd198ec801dc810 to before cc7340f18e45886121c131227985d64ef666012fAffected df133f3f96257ee29696c0ed8bd198ec801dc810 to before 6b5325f2457521bbece29499970c0117a648c620Affected df133f3f96257ee29696c0ed8bd198ec801dc810 to before f5e9a22d19bb98a7e86034db85eb295e94187caaAffected df133f3f96257ee29696c0ed8bd198ec801dc810 to before 468a729b78895893d0e580ceea49bed8ada2a2bdAffected df133f3f96257ee29696c0ed8bd198ec801dc810 to before f8321fa75102246d7415a6af441872f6637c93abAffected
LinuxLinux	5.0Affected before 5.0Not affected 5.4.284 through 5.4.Not affected 5.10.226 through 5.10.Not affected 5.15.167 through 5.15.Not affected 6.1.109 through 6.1.Not affected 6.6.50 through 6.6.Not affected 6.10.3 through 6.10.Not affected 6.11 and laterNot affected

Product

Versions

LinuxLinux

df133f3f96257ee29696c0ed8bd198ec801dc810 to before d3af435e8ace119e58d8e21d3d2d6a4e7c4a4baaAffected
df133f3f96257ee29696c0ed8bd198ec801dc810 to before 842a97b5e44f0c8a9fc356fe976e0e13ddcf7783Affected
df133f3f96257ee29696c0ed8bd198ec801dc810 to before cc7340f18e45886121c131227985d64ef666012fAffected
df133f3f96257ee29696c0ed8bd198ec801dc810 to before 6b5325f2457521bbece29499970c0117a648c620Affected
df133f3f96257ee29696c0ed8bd198ec801dc810 to before f5e9a22d19bb98a7e86034db85eb295e94187caaAffected
df133f3f96257ee29696c0ed8bd198ec801dc810 to before 468a729b78895893d0e580ceea49bed8ada2a2bdAffected
df133f3f96257ee29696c0ed8bd198ec801dc810 to before f8321fa75102246d7415a6af441872f6637c93abAffected

LinuxLinux

5.0Affected
before 5.0Not affected
5.4.284 through 5.4.*Not affected
5.10.226 through 5.10.*Not affected
5.15.167 through 5.15.*Not affected
6.1.109 through 6.1.*Not affected
6.6.50 through 6.6.*Not affected
6.10.3 through 6.10.*Not affected
6.11 and laterNot affected

References

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