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CVE-2026-99025

openvswitch: fix soft lockup in the netlink flow dump

Products / packages Linux

Published

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Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 22:05:30 UTC

Severity

unknown

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

63e7959c4b9bd6f791061c460a22d9ee32ae2240 → before ef77dd59cb7b7b0ac0bedd3fe9ee7a8acd8a58f2

git versions

63e7959c4b9bd6f791061c460a22d9ee32ae2240 → before 9ffb9897b39037a688ae01d0b3aea4ccce27dd75

git versions

63e7959c4b9bd6f791061c460a22d9ee32ae2240 → before 5b6a8bbdcdd7d0fddee466c1c7fe5b7f30aa392c

git versions

63e7959c4b9bd6f791061c460a22d9ee32ae2240 → before c995c52eba1926a5e82823fa5573a6f1b1010e5d

git versions

63e7959c4b9bd6f791061c460a22d9ee32ae2240 → before b872de585edff534056c65ba30970b68499fca14

git versions

63e7959c4b9bd6f791061c460a22d9ee32ae2240 → before 55f12552b00a34ca7ab5cf2d2b5ed02f8f06a965

git versions

63e7959c4b9bd6f791061c460a22d9ee32ae2240 → before 80db24f3c16fdeef85460d9d66a4aae7a9cb92b4

git versions

63e7959c4b9bd6f791061c460a22d9ee32ae2240 → before aaaaf87ea99b8766c9a8aa0e71aa42e6bc8a5320

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

3.16

unaffected

0 → before 3.16

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:

openvswitch: fix soft lockup in the netlink flow dump

A production compute node carrying a few thousand datapath flows hit a soft lockup inside a single netlink flow dump and panicked.

ovs_flow_cmd_dump() calls ovs_flow_stats_get() for every flow it emits, and that releases stats->lock with spin_unlock_bh() once per CPU that has touched the flow. Every release is a local_bh_enable(), and each one runs the pending softirq backlog in the dumping thread's own context.

The skb bounds the flows one callback emits, but not the softirq work it absorbs. On a CPU that carries the box's packet load the backlog refills as fast as it drains, so the dumping thread becomes that CPU's softirq engine. It never sleeps and it has no reschedule point, so under voluntary preemption nothing can take the CPU away from it: neither the ksoftirqd the kernel woke to take the work over, nor the stopper thread the softlockup detector dispatches to refresh its timestamp.

Hold BH off across the whole callback instead, the way ctnetlink_dump_table() does, so the nested spin_unlock_bh() stop draining softirqs. The loop already runs under rcu_read_lock() and cannot sleep. What it gives up is preemption under CONFIG_PREEMPT, since a BH-off region is not preemptible outside PREEMPT_RT. The region stays short: the skb caps the flows one callback emits, and empty buckets cost no skb space but are each visited once per dump, as the cursor only moves forward. The table grows on insert and shrinks only on flush, so the walk is bounded by the largest flow count the datapath has held. The softirq backlog the callback used to absorb has no bound at all.

References

8 sources
git.kernel.org/stable/c/ef77dd59cb7b7b0ac0bedd3fe9ee7a8acd8a58f2
Source referenceLinux
git.kernel.org/stable/c/9ffb9897b39037a688ae01d0b3aea4ccce27dd75
Source referenceLinux
git.kernel.org/stable/c/5b6a8bbdcdd7d0fddee466c1c7fe5b7f30aa392c
Source referenceLinux
git.kernel.org/stable/c/c995c52eba1926a5e82823fa5573a6f1b1010e5d
Source referenceLinux
git.kernel.org/stable/c/b872de585edff534056c65ba30970b68499fca14
Source referenceLinux
git.kernel.org/stable/c/55f12552b00a34ca7ab5cf2d2b5ed02f8f06a965
Source referenceLinux
View 2 more references
git.kernel.org/stable/c/80db24f3c16fdeef85460d9d66a4aae7a9cb92b4
Source referenceLinux
git.kernel.org/stable/c/aaaaf87ea99b8766c9a8aa0e71aa42e6bc8a5320
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-2026-99025

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): 3.16

Before: 5.10.273

Vulnerable product

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

From (inclusive): 3.16

Before: 5.15.224

Vulnerable product

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

From (inclusive): 3.16

Before: 6.1.191

Vulnerable product

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

From (inclusive): 3.16

Before: 6.6.160

Vulnerable product

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

From (inclusive): 3.16

Before: 6.12.113

Vulnerable product

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

From (inclusive): 3.16

Before: 6.18.57

Vulnerable product

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

From (inclusive): 3.16

Before: 7.2.11

Vulnerable product

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

From (inclusive): 3.16

Before: 7.3

Applicability preview
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    "nodes": [
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        "cpeMatch": [
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            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          {
            "vulnerable": true,
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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.