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CVE-2026-98568

vxlan: use one headroom snapshot for neighbour replies

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

12 ranges
Linux version evidence

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

affected

4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa → before e3e24f4c434c56952412f875b834aa9daaa4fb15

git versions

4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa → before 9ed5a548b42d46e6968a46b67ca8a8e49b12a5a1

git versions

4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa → before fcaf456092dc86fd5b0b523ac27ec0d114066931

git versions

4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa → before 45a67662bf8ce3aa5643accf98d328dfbb47eaf6

git versions

4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa → before 315d42ca39f69846662961c25dcf2bb07c350d14

git versions

4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa → before a3c5eb6e382dd426a5e7eb08608897ed57167ff7

git versions

4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa → before ff022fd9d0f0282c575e11778b96bd1b637503eb

git versions

4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa → before 481506a756dcd828ef42391cb08f38d8d96d38fc

git versions

d8be18c52dbc94989f6d74637b731af39cd3d902

git versions

3927dace523706cc00f808520eaf2125dd7c07b5

git versions

3.12.18 → before 3.13

semver versions

3.13.10 → before 3.14

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

3.14

unaffected

0 → before 3.14

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

6.6.158 → through 6.6.*

semver versions

6.12.112 → through 6.12.*

semver versions

6.18.55 → through 6.18.*

semver versions

7.2.9 → 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:

vxlan: use one headroom snapshot for neighbour replies

vxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then samples it again to reserve headroom. A concurrent vxlan_changelink() can update needed_headroom between the two reads, creating a TOCTOU race. The second value can exceed the allocation and make the Ethernet header write out of bounds.

The race is reproducible on the unpatched kernel. It occurred when vxlan_na_create() generated a neighbour reply while vxlan_changelink() changed the link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte skbuff_small_head allocation.

Snapshot the headroom once and use that value for both allocation and reservation.

References

8 sources
git.kernel.org/stable/c/e3e24f4c434c56952412f875b834aa9daaa4fb15
Source referenceLinux
git.kernel.org/stable/c/9ed5a548b42d46e6968a46b67ca8a8e49b12a5a1
Source referenceLinux
git.kernel.org/stable/c/fcaf456092dc86fd5b0b523ac27ec0d114066931
Source referenceLinux
git.kernel.org/stable/c/45a67662bf8ce3aa5643accf98d328dfbb47eaf6
Source referenceLinux
git.kernel.org/stable/c/315d42ca39f69846662961c25dcf2bb07c350d14
Source referenceLinux
git.kernel.org/stable/c/a3c5eb6e382dd426a5e7eb08608897ed57167ff7
Source referenceLinux
View 2 more references
git.kernel.org/stable/c/ff022fd9d0f0282c575e11778b96bd1b637503eb
Source referenceLinux
git.kernel.org/stable/c/481506a756dcd828ef42391cb08f38d8d96d38fc
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-2026-98568

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): 3.14

Before: 5.10.273

Vulnerable product

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

From (inclusive): 3.14

Before: 5.15.224

Vulnerable product

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

From (inclusive): 3.14

Before: 6.1.191

Vulnerable product

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

From (inclusive): 3.14

Before: 6.6.158

Vulnerable product

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

From (inclusive): 3.14

Before: 6.12.112

Vulnerable product

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

From (inclusive): 3.14

Before: 6.18.55

Vulnerable product

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

From (inclusive): 3.14

Before: 7.2.9

Vulnerable product

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

From (inclusive): 3.14

Before: 7.3

Vulnerable product

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

From (inclusive): 3.12.18

Vulnerable product

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

From (inclusive): 3.13.10

Applicability preview
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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.