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CVE-2026-99054

tipc: destroy topsrv workqueues before closing connections

Products / packages Linux

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:45:32 UTC
Linux · CVSS:3.1 · 7.8
Assessment vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity

high7.8

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

8 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f → before 09dbd610f78aaed65d7b379c270ce4090a8151ac

git versions

c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f → before 21622e5ae8b232c2e64eb1adf5546cf078d2987d

git versions

c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f → before 7167afaaaee37191f8b6afa0c91e0fef41460705

git versions

c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f → before 7f796bb3b440d7f1b14c0e3b520462eb34f553af

git versions

c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f → before da9c16568bc79140a54c1f5fcf07a0305df47b37

git versions

c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f → before 0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e

git versions

c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f → before fb717c536af2aafeca520ff11d1e0f25f7ab8fa9

git versions

c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f → before 3acdd44385bc7e2e57605e073691ce69cc5a960d

git versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

10 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

3.11

unaffected

0 → before 3.11

semver versions

5.10.273 → through 5.10.*

semver versions

5.15.224 → through 5.15.*

semver versions

6.1.191 → through 6.1.*

semver versions

6.6.160 → through 6.6.*

semver versions

6.12.113 → through 6.12.*

semver versions

6.18.57 → through 6.18.*

semver versions

7.2.11 → through 7.2.*

semver versions

7.3 → through *

original_commit_for_fix versions

unknown

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

In 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.

References

8 sources
git.kernel.org/stable/c/09dbd610f78aaed65d7b379c270ce4090a8151ac
Source referenceLinux
git.kernel.org/stable/c/21622e5ae8b232c2e64eb1adf5546cf078d2987d
Source referenceLinux
git.kernel.org/stable/c/7167afaaaee37191f8b6afa0c91e0fef41460705
Source referenceLinux
git.kernel.org/stable/c/7f796bb3b440d7f1b14c0e3b520462eb34f553af
Source referenceLinux
git.kernel.org/stable/c/da9c16568bc79140a54c1f5fcf07a0305df47b37
Source referenceLinux
git.kernel.org/stable/c/0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e
Source referenceLinux
View 2 more references
git.kernel.org/stable/c/fb717c536af2aafeca520ff11d1e0f25f7ab8fa9
Source referenceLinux
git.kernel.org/stable/c/3acdd44385bc7e2e57605e073691ce69cc5a960d
Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification · not supplied
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-99054

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.11

Before: 5.10.273

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.11

Before: 5.15.224

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.11

Before: 6.1.191

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.11

Before: 6.6.160

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.11

Before: 6.12.113

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.11

Before: 6.18.57

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.11

Before: 7.2.11

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.11

Before: 7.3

Applicability preview
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            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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Contributing organizations · 1
Linux

Assigning organization

2026-10-30

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.