tipc: destroy topsrv workqueues before closing connections

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99054
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 13:17:29 UTC
Updated2026-10-24 14:16:54 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: tipc: destroy topsrv workqueues before closing connections tipc_topsrv_stop() closed subscriber connections while the topology server's send and receive workqueues were still running. Socket callbacks and subscription events could then queue more work, and in-flight send/recv work could drop the last connection reference during the conn_idr walk. That race produced several teardown failures: refcount_t addition on 0 from conn_get() on a connection whose release was blocked on idr_lock, a subsequent use-after-free in tipc_conn_close(), queue_work() on an already destroyed workqueue from the listener data-ready callback, and an RCU stall in tipc_topsrv_exit_net() while the walk spun under idr_lock. Clear srv->listener under idr_lock so it acts as a shutdown flag, skip queue_work() once it is NULL, destroy the workqueues to flush in-flight work, and only then close the remaining connections. Refuse tipc_conn_lookup() after that flag is cleared, and drop idr_lock when the teardown walk finds no connection, so an in-flight subscription event cannot pin idr_in_use while the walk holds the lock. v3 supersedes the narrower in-thread diff Tung Quang Nguyen posted on 2026-09-23. It keeps his teardown order and adds the lookup refusal and the empty-idr unlock.

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

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 c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f 7f796bb3b440d7f1b14c0e3b520462eb34f553af git Not specified
CNA Linux Linux affected c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f da9c16568bc79140a54c1f5fcf07a0305df47b37 git Not specified
CNA Linux Linux affected c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f 0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e git Not specified
CNA Linux Linux affected c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f fb717c536af2aafeca520ff11d1e0f25f7ab8fa9 git Not specified
CNA Linux Linux affected c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f 3acdd44385bc7e2e57605e073691ce69cc5a960d git Not specified
CNA Linux Linux affected 3.11 Not specified
CNA Linux Linux unaffected 3.11 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.57 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.11 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/da9c16568bc79140a54c1f5fcf07a0305df47b37 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7f796bb3b440d7f1b14c0e3b520462eb34f553af 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3acdd44385bc7e2e57605e073691ce69cc5a960d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fb717c536af2aafeca520ff11d1e0f25f7ab8fa9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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