tun: free page on build_skb failure in tun_xdp_one()

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Summary

CVECVE-2026-46322
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-09 13:16:37 UTC
Updated2026-06-14 06:16:24 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: tun: free page on build_skb failure in tun_xdp_one() When build_skb() fails in tun_xdp_one(), the function sets ret to -ENOMEM and jumps to the out label, which returns without freeing the page that vhost_net_build_xdp() allocated for the frame. As with the short-frame rejection path, tun_sendmsg() discards the per-buffer error and still returns total_len, so vhost_tx_batch() takes the success path and never frees the page. Each build_skb() failure in a batch leaks one page-frag chunk. Free the page before taking the error path, matching the put_page() the other error exits of tun_xdp_one() already perform.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000180000 probability, percentile 0.047810000 (date 2026-06-13)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 043d222f93ab8c76b56a3b315cd8692e35affb6c d16e38fac09a47bfcf98c1ad65a1bb53f94540f5 git Not specified
CNA Linux Linux affected 043d222f93ab8c76b56a3b315cd8692e35affb6c aa308e9dbb9acb17cacdbbce9e4504f69bac8385 git Not specified
CNA Linux Linux affected 043d222f93ab8c76b56a3b315cd8692e35affb6c 4fefc6156a162a9f50035c12091a5e5130c82c6e git Not specified
CNA Linux Linux affected 043d222f93ab8c76b56a3b315cd8692e35affb6c aa8963fdce667a42fb7f0bdd2909fadcab02f9a8 git Not specified
CNA Linux Linux affected 4.20 Not specified
CNA Linux Linux unaffected 4.20 semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/aa8963fdce667a42fb7f0bdd2909fadcab02f9a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aa308e9dbb9acb17cacdbbce9e4504f69bac8385 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4fefc6156a162a9f50035c12091a5e5130c82c6e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d16e38fac09a47bfcf98c1ad65a1bb53f94540f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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