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CVE-2026-99057

xen/netfront: don't leak the skb when xennet_fill_frags() fails

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, 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

16 ranges
Linux version evidence

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

affected

ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c → before 6e6bd1051daabc327233c3ca3d00613fc6783c8e

git versions

ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c → before 0cf0a25a639c535146c5eb4480d256995721aed6

git versions

ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c → before 53a131eb2a998c77e2851401b32b712d6c6e8487

git versions

ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c → before 5051df031144753d3e18862514969146b601d089

git versions

ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c → before 99011a11c97340ef7290df7dc199305c73fab2f2

git versions

ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c → before 086944c1c2cbb683543bc3ff08637847b03c8009

git versions

ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c → before 84e3ea6502b5f14ce8d499d0b6e0e38386274cf0

git versions

ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c → before 93ccaf1c26e2133396173b76a071e59024daa622

git versions

bd1468048aa3e2af865da92990539946d4483989

git versions

29a6193c0d74390c004808441061ac1812cf6f51

git versions

7eced4478f4ec6ff0a603ddfd6e24a5d3831fca7

git versions

b73a161e9beff24bf1803ba393dff95a255268f9

git versions

4.4.159 → before 4.5

semver versions

4.9.130 → before 4.10

semver versions

4.14.73 → before 4.15

semver versions

4.18.11 → before 4.19

semver 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

4.19

unaffected

0 → before 4.19

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:

xen/netfront: don't leak the skb when xennet_fill_frags() fails

When a response chain has more slots than fit in the skb's frags, xennet_fill_frags() returns an error and xennet_poll() jumps to its error path. That path moves what's left on tmpq to errq to be freed, but the skb being filled was already dequeued from tmpq, so it's never freed. Each chain that overflows leaks the skb and the pages attached to it as frags, and the backend decides how many slots it sends.

Put the skb back on tmpq before taking the error path, like the xennet_set_skb_gso() failure just above it does.

References

8 sources
git.kernel.org/stable/c/6e6bd1051daabc327233c3ca3d00613fc6783c8e
Source referenceLinux
git.kernel.org/stable/c/0cf0a25a639c535146c5eb4480d256995721aed6
Source referenceLinux
git.kernel.org/stable/c/53a131eb2a998c77e2851401b32b712d6c6e8487
Source referenceLinux
git.kernel.org/stable/c/5051df031144753d3e18862514969146b601d089
Source referenceLinux
git.kernel.org/stable/c/99011a11c97340ef7290df7dc199305c73fab2f2
Source referenceLinux
git.kernel.org/stable/c/086944c1c2cbb683543bc3ff08637847b03c8009
Source referenceLinux
View 2 more references
git.kernel.org/stable/c/84e3ea6502b5f14ce8d499d0b6e0e38386274cf0
Source referenceLinux
git.kernel.org/stable/c/93ccaf1c26e2133396173b76a071e59024daa622
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-2026-99057

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): 4.19

Before: 5.10.273

Vulnerable product

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

From (inclusive): 4.19

Before: 5.15.224

Vulnerable product

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

From (inclusive): 4.19

Before: 6.1.191

Vulnerable product

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

From (inclusive): 4.19

Before: 6.6.160

Vulnerable product

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

From (inclusive): 4.19

Before: 6.12.113

Vulnerable product

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

From (inclusive): 4.19

Before: 6.18.57

Vulnerable product

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

From (inclusive): 4.19

Before: 7.2.11

Vulnerable product

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

From (inclusive): 4.19

Before: 7.3

Vulnerable product

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

From (inclusive): 4.4.159

Vulnerable product

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

From (inclusive): 4.9.130

Vulnerable product

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

From (inclusive): 4.14.73

Vulnerable product

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

From (inclusive): 4.18.11

Applicability preview
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.19",
            "versionEndExcluding": "5.10.273"
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          {
            "vulnerable": true,
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          {
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          {
            "vulnerable": true,
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            "versionStartIncluding": "4.19",
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          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.4.159"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.9.130"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.14.73"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.18.11"
          }
        ]
      }
    ]
  }
]
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.