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CVE-2026-99286

xen-netback: Fix XenBus connection failure cleanup

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, 20:55:32 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

15 ranges
Linux version evidence

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

affected

6cd611d2abdd8623a554e14145f82c1cb4e4467a → before ade3082dcdee17c5767069883936d64ff83f6c9f

git versions

37d5a73170579b30e67cc8b19ec69715eea3a6b6 → before a97aa838903d15f865d80809f5198ff459c6634a

git versions

4867687b6ad28ab84bc0811d8f8f9972e769da02 → before 07aca7d25ce8578fedde49855983a01c537a782b

git versions

5fb756f1bbec7a3862dda5d79028bf656271804c

git versions

4223b33be49ee09acb6f1d26beb4a36dd3b8d63a

git versions

ab9cdf1291be551da999510b30216a2886074d7a

git versions

36f858f228e3f955b9336af7f94634747c221518

git versions

89e534265b62c94749639350200b10370564bb3a

git versions

6.12.116 → before 6.12.117

semver versions

6.18.62 → before 6.18.63

semver versions

7.3.3 → before 7.3.4

semver versions

5.10.274 → before 5.11

semver versions

5.15.225 → before 5.16

semver versions

6.1.192 → before 6.2

semver versions

6.6.162 → before 6.7

semver versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

5 ranges
Linux version evidence

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

affected

7.4-rc2

unaffected

0 → before 7.4-rc2

semver versions

6.12.117 → through 6.12.*

semver versions

6.18.63 → through 6.18.*

semver versions

7.3.4 → through 7.3.*

semver 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:

xen-netback: Fix XenBus connection failure cleanup

xenvif_get_stats and xenvif_get_ethtool_stats capture vif->num_queues under rcu_read_lock. We need to unpublish vif->num_queues before synchronize_net to ensure that readers that come afterwards will not read a non-zero vif->num_queues and attempt to access invalid queues.

This is the same cleanup algorithm as used in backend_disconnect and added in commit b17075d5c198 ("xen-netback: fix race condition on XenBus disconnect").

This is XSA-531

References

5 sources
git.kernel.org/stable/c/ade3082dcdee17c5767069883936d64ff83f6c9f
Source referenceLinux
git.kernel.org/stable/c/a97aa838903d15f865d80809f5198ff459c6634a
Source referenceLinux
git.kernel.org/stable/c/07aca7d25ce8578fedde49855983a01c537a782b
Source referenceLinux
www.openwall.com/lists/oss-security/2026/11/10/25
Security advisoryCVE
xenbits.xen.org/xsa/advisory-531.html
Source referenceCVE

Inside the record

Evidence available

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

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

Original records

CVE-2026-99286

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): 6.12.116

Before: 6.12.117

Vulnerable product

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

From (inclusive): 6.18.62

Before: 6.18.63

Vulnerable product

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

From (inclusive): 7.3.3

Before: 7.3.4

Vulnerable product

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

From (inclusive): 7.4-rc2

Vulnerable product

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

From (inclusive): 5.10.274

Vulnerable product

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

From (inclusive): 5.15.225

Vulnerable product

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

From (inclusive): 6.1.192

Vulnerable product

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

From (inclusive): 6.6.162

Applicability preview
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.12.116",
            "versionEndExcluding": "6.12.117"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.18.62",
            "versionEndExcluding": "6.18.63"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "7.3.3",
            "versionEndExcluding": "7.3.4"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "7.4-rc2"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.10.274"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.15.225"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.1.192"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.6.162"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
Linux

Assigning organization

2026-11-13
CVE

Additional data publisher

2026-11-10

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

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