virtio-net: fix received length check in big packets

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-40292
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-08 01:16:01 UTC
Updated2026-07-30 06:24:27 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: virtio-net: fix received length check in big packets Since commit 4959aebba8c0 ("virtio-net: use mtu size as buffer length for big packets"), when guest gso is off, the allocated size for big packets is not MAX_SKB_FRAGS * PAGE_SIZE anymore but depends on negotiated MTU. The number of allocated frags for big packets is stored in vi->big_packets_num_skbfrags. Because the host announced buffer length can be malicious (e.g. the host vhost_net driver's get_rx_bufs is modified to announce incorrect length), we need a check in virtio_net receive path. Currently, the check is not adapted to the new change which can lead to NULL page pointer dereference in the below while loop when receiving length that is larger than the allocated one. This commit fixes the received length check corresponding to the new change.

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001500000 probability, percentile 0.047680000 (date 2026-07-31)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4959aebba8c06992abafa09d1e80965e0825af54 82f9028e83944a9eee5229cbc6fee9be1de8a62d git Not specified
CNA Linux Linux affected 4959aebba8c06992abafa09d1e80965e0825af54 946dec89c41726b94d31147ec528b96af0be1b5a git Not specified
CNA Linux Linux affected 4959aebba8c06992abafa09d1e80965e0825af54 82fe78065450d2d07f36a22e2b6b44955cf5ca5b git Not specified
CNA Linux Linux affected 4959aebba8c06992abafa09d1e80965e0825af54 3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2 git Not specified
CNA Linux Linux affected 4959aebba8c06992abafa09d1e80965e0825af54 0c716703965ffc5ef4311b65cb5d84a703784717 git Not specified
CNA Linux Linux affected 6.1 Not specified
CNA Linux Linux unaffected 6.1 semver Not specified
CNA Linux Linux unaffected 6.1.159 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.117 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.58 6.12.* semver Not specified
CNA Linux Linux unaffected 6.17.8 6.17.* semver Not specified
CNA Linux Linux unaffected 6.18 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0c716703965ffc5ef4311b65cb5d84a703784717 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/82fe78065450d2d07f36a22e2b6b44955cf5ca5b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/82f9028e83944a9eee5229cbc6fee9be1de8a62d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/946dec89c41726b94d31147ec528b96af0be1b5a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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