CVE-2024-43835

virtio_net: Fix napi_skb_cache_put warning

MEDIUM

5.5

CVSS Score

Published: August 17, 2024 at 09:21 AM UTC

Updated: June 17, 2026 at 07:51 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

5.0 ≤ v < 5.10.2265.0 ≤ v < 5.15.1675.0 ≤ v < 5.4.2845.0 ≤ v < 6.1.1095.0 ≤ v < 6.10.35.0 ≤ v < 6.115.0 ≤ v < 6.6.505.0df133f3f96257ee29696c0ed8bd198ec801dc810

Vendor states this is fixed in 468a729b78895893d0e580ceea49bed8ada2a2bd (fixed)

Vendor states this is fixed in 6b5325f2457521bbece29499970c0117a648c620 (fixed)

Vendor states this is fixed in 842a97b5e44f0c8a9fc356fe976e0e13ddcf7783 (fixed)

Vendor states this is fixed in cc7340f18e45886121c131227985d64ef666012f (fixed)

Vendor states this is fixed in d3af435e8ace119e58d8e21d3d2d6a4e7c4a4baa (fixed)

Vendor states this is fixed in f5e9a22d19bb98a7e86034db85eb295e94187caa (fixed)

Vendor states this is fixed in f8321fa75102246d7415a6af441872f6637c93ab (fixed)

Vendor states this is fixed in 5.0 (unaffected)

Vendor states this is fixed in 5.10.226 (unaffected)

Vendor states this is fixed in 5.15.167 (unaffected)

Vendor states this is fixed in 5.4.284 (unaffected)

Vendor states this is fixed in 6.1.109 (unaffected)