CVE-2026-99287

xen-netback: Zero out sring pointers on unmap

Products / packages Linux

Published 10/11/2026, 18:16:54 UTC

Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:10:34 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

3 ranges

Linux version evidence

Check a product version

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

affected

2ac061ce97f413bfbbdd768f7d2e0fda2e8170df → before 87fd475dc4e354088f6534285388e7b061f54b35

git versions

2ac061ce97f413bfbbdd768f7d2e0fda2e8170df → before c5f54af611ff6fe1d53fa05d8e87b469dc56122b

git versions

2ac061ce97f413bfbbdd768f7d2e0fda2e8170df → before e7ba61734d6ad6adfd5bf617052e590743211669

git versions

Other versions: unaffected

Linux · Linux

Linux

5 ranges

Linux version evidence

Check a product version

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

affected

5.5

unaffected

0 → before 5.5

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

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: Zero out sring pointers on unmap

If xenvif_map_frontend_data_rings() fails when a ring is already mapped, it unmaps them via xenvif_unmap_frontend_data_rings() which keeps the ring pointers unchanged. xenvif_connect_data()'s cleanup path calls xenvif_disconnect_queue() which in turn calls xenvif_unmap_frontend_data_rings() again, which will attempt to unmap the pointers a second time.

Zero out the ring pointers after they are unmapped to avoid this issue.

This is XSA-532

References

5 sources

git.kernel.org/stable/c/87fd475dc4e354088f6534285388e7b061f54b35

Source referenceLinux

git.kernel.org/stable/c/c5f54af611ff6fe1d53fa05d8e87b469dc56122b

Source referenceLinux

git.kernel.org/stable/c/e7ba61734d6ad6adfd5bf617052e590743211669

Source referenceLinux

www.openwall.com/lists/oss-security/2026/11/10/26

Security advisoryCVE

xenbits.xen.org/xsa/advisory-532.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-2026-99287

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): 5.5

After:

Through (inclusive):

Before: 6.12.117

Vulnerable product

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

From (inclusive): 5.5

After:

Through (inclusive):

Before: 6.18.63

Vulnerable product

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

From (inclusive): 5.5

After:

Through (inclusive):

Before: 7.3.4

Applicability preview

[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.5",
            "versionEndExcluding": "6.12.117"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.5",
            "versionEndExcluding": "6.18.63"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.5",
            "versionEndExcluding": "7.3.4"
          }
        ]
      }
    ]
  }
]

Contributing organizations · 2

Linux

Assigning organization

2026-11-10

CVE

Additional data publisher

2026-11-10

Timeline

All times UTC

10 Nov 2026, 18:16
Advisory published
Publication date supplied by the source.
10 Nov 2026, 21:05
Source updated
Latest modification date supplied by the source.
11 Nov 2026, 02:57
Last imported by cve.new
Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes

CVE · CVE-2026-992872026-11-11

Observed 2026-11-11T02:57:10.989Z · upstream updated 2026-11-10T21:05:27.340Z

References changed

before

[
  "https://git.kernel.org/stable/c/87fd475dc4e354088f6534285388e7b061f54b35",
  "https://git.kernel.org/stable/c/c5f54af611ff6fe1d53fa05d8e87b469dc56122b",
  "https://git.kernel.org/stable/c/e7ba61734d6ad6adfd5bf617052e590743211669"
]

after

[
  "https://git.kernel.org/stable/c/87fd475dc4e354088f6534285388e7b061f54b35",
  "https://git.kernel.org/stable/c/c5f54af611ff6fe1d53fa05d8e87b469dc56122b",
  "https://git.kernel.org/stable/c/e7ba61734d6ad6adfd5bf617052e590743211669",
  "http://www.openwall.com/lists/oss-security/2026/11/10/26",
  "http://xenbits.xen.org/xsa/advisory-532.html"
]

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

Showing up to 50 most recent observed changes.

Reading the signals

Severity · CVSS: Technical impact and attack conditions. No numeric assessment supplied.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: No EPSS estimate available in this record.

Record identifiers

Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

CVE CVE-2026-99287

Enrichment coverage

NVDNot fully checked

GHSANot fully checked

EUVDNot fully checked

EPSSRefresh failed

Previous evidence retained where available.

Sponsored by MoxsoBuild security habits with adaptive training and phishing simulations.View as JSON

xen-netback: Zero out sring pointers on unmap

Severity and exploitation

What this means

Attack conditions

Affected versions

Linux

affected

unaffected

unknown

Linux

affected

unaffected

unknown

What to do

Public exploit evidence

Original source description

References

Inside the record

Evidence available

Original records

Environment requirements

Timeline

Advisory published

Source updated

Last imported by cve.new

What changed