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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
df133f3f96257ee29696c0ed8bd198ec801dc810 to < d3af435e8ace119e58d8e21d3d2d6a4e7c4a4baaaffecteddf133f3f96257ee29696c0ed8bd198ec801dc810 to < 842a97b5e44f0c8a9fc356fe976e0e13ddcf7783affecteddf133f3f96257ee29696c0ed8bd198ec801dc810 to < cc7340f18e45886121c131227985d64ef666012faffecteddf133f3f96257ee29696c0ed8bd198ec801dc810 to < 6b5325f2457521bbece29499970c0117a648c620affecteddf133f3f96257ee29696c0ed8bd198ec801dc810 to < f5e9a22d19bb98a7e86034db85eb295e94187caaaffecteddf133f3f96257ee29696c0ed8bd198ec801dc810 to < 468a729b78895893d0e580ceea49bed8ada2a2bdaffecteddf133f3f96257ee29696c0ed8bd198ec801dc810 to < f8321fa75102246d7415a6af441872f6637c93abaffected
Linux Linux
Default version status: affected
5.0affected0 to < 5.0unaffected5.4.284 to ≤ 5.4.*unaffected5.10.226 to ≤ 5.10.*unaffected5.15.167 to ≤ 5.15.*unaffected6.1.109 to ≤ 6.1.*unaffected6.6.50 to ≤ 6.6.*unaffected6.10.3 to ≤ 6.10.*unaffected6.11 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/d3af435e8ace119e58d8e21d3d2d6a4e7c4a4baa ↗
- https://git.kernel.org/stable/c/842a97b5e44f0c8a9fc356fe976e0e13ddcf7783 ↗
- https://git.kernel.org/stable/c/cc7340f18e45886121c131227985d64ef666012f ↗
- https://git.kernel.org/stable/c/6b5325f2457521bbece29499970c0117a648c620 ↗
- https://git.kernel.org/stable/c/f5e9a22d19bb98a7e86034db85eb295e94187caa ↗
- https://git.kernel.org/stable/c/468a729b78895893d0e580ceea49bed8ada2a2bd ↗
- https://git.kernel.org/stable/c/f8321fa75102246d7415a6af441872f6637c93ab ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗
- https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html ↗