CVE-2024-43835: virtio_net: Fix napi_skb_cache_put warning
First published: Sat Aug 17 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=5.0<6.10.3 | |
| debian/linux | <=5.10.223-1 | 5.10.226-1 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
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Reference Links
- https://git.kernel.org/stable/c/19ac6f29bf64304ef04630c8ab56ecd2059d7aa1
- 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://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-43835
- https://nvd.nist.gov/vuln/detail/CVE-2024-43835
- https://launchpad.net/bugs/cve/CVE-2024-43835
- https://security-tracker.debian.org/tracker/CVE-2024-43835
- https://ubuntu.com/security/CVE-2024-43835
- https://git.kernel.org/linus/f8321fa75102246d7415a6af441872f6637c93ab
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