openvswitch: only skb_tx_error() a packet we are about to drop

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89487
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:30 UTC
Updated2026-09-14 13:19:05 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: openvswitch: only skb_tx_error() a packet we are about to drop queue_userspace_packet() borrows the packet skb -- it only copies it into a private netlink message (user_skb) and does not own it; on return do_execute_actions() keeps forwarding it through the flow's remaining actions. Its error path nevertheless calls skb_tx_error(skb), which via skb_zcopy_clear() does skb_shinfo(skb)->flags &= ~SKBFL_ALL_ZEROCOPY, stripping SKBFL_SHARED_FRAG from that live skb (skb_tx_error()'s kerneldoc says "skb must be freed afterwards"). For a MSG_ZEROCOPY skb carrying page-cache frags, SKBFL_SHARED_FRAG is what makes esp_input() skb_cow_data() before in-place AEAD; once it is stripped a later local ESP-in-UDP delivery decrypts in place over pages the sender does not own -- an unprivileged page-cache write (the "Fragnesia" primitive). do_execute_actions() ignores output_userspace()'s return value, so any action after a failed USERSPACE upcall inherits the stripped skb. Move the skb_tx_error() to the flow-miss drop path - the "default" branch of ovs_dp_process_packet()'s switch(error), before kfree_skb(). The call has been here since commit 36d5fe6a0007 ("core, nfqueue, openvswitch: Orphan frags in skb_zerocopy and handle errors") but was harmless until esp_input() began relying on SKBFL_SHARED_FRAG to gate in-place decrypt; only then did stripping it on a still-forwarded skb become a page-cache write primitive.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001280000 probability, percentile 0.028310000 (date 2026-09-14)

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

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 36d5fe6a000790f56039afe26834265db0a3ad4c 5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a git Not specified
CNA Linux Linux affected 36d5fe6a000790f56039afe26834265db0a3ad4c 48db11e115d1b232edc5591604adc6eda95cd545 git Not specified
CNA Linux Linux affected 36d5fe6a000790f56039afe26834265db0a3ad4c 4477222e2916a18e273edc139c955ade6bbb7a69 git Not specified
CNA Linux Linux affected 36d5fe6a000790f56039afe26834265db0a3ad4c 4d5c460ef8754be1d43b16dbf02695b008b207d6 git Not specified
CNA Linux Linux affected 36d5fe6a000790f56039afe26834265db0a3ad4c 6767d70cf46f65807a6a4c4406a518e6c12e36ae git Not specified
CNA Linux Linux affected 36d5fe6a000790f56039afe26834265db0a3ad4c e41a59fc056f63a7a1f42788913c53cc48d744aa git Not specified
CNA Linux Linux affected 36d5fe6a000790f56039afe26834265db0a3ad4c 5d85eef222cfd28e73deed7402c100229e8b9e6e git Not specified
CNA Linux Linux affected 36d5fe6a000790f56039afe26834265db0a3ad4c 0dbc2398fca3bb33eda963849f865ddb1b3aa05e git Not specified
CNA Linux Linux affected c5f0c0e7525443add533495e93ba8de6feab2396 git Not specified
CNA Linux Linux affected 1674b4bf3eea3cac51b70778e89f8025f7cfe695 git Not specified
CNA Linux Linux affected 3.10.51 3.11 semver Not specified
CNA Linux Linux affected 3.12.40 3.13 semver Not specified
CNA Linux Linux affected 3.14 Not specified
CNA Linux Linux unaffected 3.14 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6767d70cf46f65807a6a4c4406a518e6c12e36ae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5d85eef222cfd28e73deed7402c100229e8b9e6e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4d5c460ef8754be1d43b16dbf02695b008b207d6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0dbc2398fca3bb33eda963849f865ddb1b3aa05e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/48db11e115d1b232edc5591604adc6eda95cd545 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4477222e2916a18e273edc139c955ade6bbb7a69 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e41a59fc056f63a7a1f42788913c53cc48d744aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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