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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

No data.

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/19ac6f29bf64304ef04630c8ab56ecd2059d7aa1 cve-icon cve-icon
https://git.kernel.org/stable/c/468a729b78895893d0e580ceea49bed8ada2a2bd cve-icon cve-icon
https://git.kernel.org/stable/c/6b5325f2457521bbece29499970c0117a648c620 cve-icon cve-icon
https://git.kernel.org/stable/c/842a97b5e44f0c8a9fc356fe976e0e13ddcf7783 cve-icon cve-icon
https://git.kernel.org/stable/c/cc7340f18e45886121c131227985d64ef666012f cve-icon cve-icon
https://git.kernel.org/stable/c/d3af435e8ace119e58d8e21d3d2d6a4e7c4a4baa cve-icon cve-icon
https://git.kernel.org/stable/c/f5e9a22d19bb98a7e86034db85eb295e94187caa cve-icon cve-icon
https://git.kernel.org/stable/c/f8321fa75102246d7415a6af441872f6637c93ab cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2024081728-CVE-2024-43835-5f11@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2024-43835 cve-icon
https://www.cve.org/CVERecord?id=CVE-2024-43835 cve-icon
History

Tue, 17 Sep 2024 10:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-667

Thu, 12 Sep 2024 12:00:00 +0000

Type Values Removed Values Added
References

Wed, 11 Sep 2024 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Sun, 08 Sep 2024 07:30:00 +0000

Type Values Removed Values Added
References

Mon, 19 Aug 2024 19:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Sat, 17 Aug 2024 09:30:00 +0000

Type Values Removed Values Added
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.
Title virtio_net: Fix napi_skb_cache_put warning
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-08-17T09:21:52.425Z

Updated: 2024-09-15T17:53:58.685Z

Reserved: 2024-08-17T09:11:59.274Z

Link: CVE-2024-43835

cve-icon Vulnrichment

Updated: 2024-09-11T12:42:23.121Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2024-08-17T10:15:09.183

Modified: 2024-09-12T12:15:48.653

Link: CVE-2024-43835

cve-icon Redhat

Severity : Moderate

Publid Date: 2024-08-17T00:00:00Z

Links: CVE-2024-43835 - Bugzilla