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CVE-2026-99284

net: skbuff: propagate shared-frag marker in skb_zerocopy()

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, 21:00:34 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

5 ranges
Linux version evidence

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

affected

af2806f8f90a150160be898cd85332459c83c5cb → before fe8477e23dd2ee6bce231d65f2586a333b211dc0

git versions

af2806f8f90a150160be898cd85332459c83c5cb → before 1c623e3cbf43f12dd4a72712079bfa247a9b8ba3

git versions

af2806f8f90a150160be898cd85332459c83c5cb → before d7d6ff98d5d1b400f02211f962ac32cc0020aeab

git versions

af2806f8f90a150160be898cd85332459c83c5cb → before 1a9c180cd8435917b7516edfb1c9148032c28773

git versions

af2806f8f90a150160be898cd85332459c83c5cb → before 79dc34beb1fdb3da79753e51e15c68591a2561fe

git versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

7 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

6.12.117 → through 6.12.*

semver versions

6.18.61 → through 6.18.*

semver versions

7.2.15 → through 7.2.*

semver versions

7.3.2 → through 7.3.*

semver versions

7.4-rc1 → 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:

net: skbuff: propagate shared-frag marker in skb_zerocopy()

skb_zerocopy() moves frag descriptors from @from into @to and takes a reference on each frag, but it does not copy skb_shinfo(from)->flags into skb_shinfo(to)->flags. A destination skb holding the same page-cache backed frags as the source therefore reports skb_has_shared_frag() as false.

That breaks the invariant relied on by later in-place writers. ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(); with the marker lost, an skb that skb_zerocopy() built for nfnetlink_queue or for an openvswitch upcall is decrypted in place, letting an unprivileged user write into the page cache of a root-owned read-only file.

Propagate SKBFL_SHARED_FRAG when frag descriptors are copied, as done for the other frag-transfer helpers.

References

5 sources
git.kernel.org/stable/c/fe8477e23dd2ee6bce231d65f2586a333b211dc0
Source referenceLinux
git.kernel.org/stable/c/1c623e3cbf43f12dd4a72712079bfa247a9b8ba3
Source referenceLinux
git.kernel.org/stable/c/d7d6ff98d5d1b400f02211f962ac32cc0020aeab
Source referenceLinux
git.kernel.org/stable/c/1a9c180cd8435917b7516edfb1c9148032c28773
Source referenceLinux
git.kernel.org/stable/c/79dc34beb1fdb3da79753e51e15c68591a2561fe
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-2026-99284

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: 6.12.117

Vulnerable product

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

From (inclusive): 3.14

Before: 6.18.61

Vulnerable product

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

From (inclusive): 3.14

Before: 7.2.15

Vulnerable product

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

From (inclusive): 3.14

Before: 7.3.2

Vulnerable product

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

From (inclusive): 3.14

Before: 7.4-rc1

Applicability preview
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Contributing organizations · 1
Linux

Assigning organization

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
  1. CVE · CVE-2026-99284

    Observed 2026-11-10T20:29:58.401Z · upstream updated 2026-11-10T18:15:30.724Z

    Product or version evidence changed

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    References changed

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    after

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    Environment requirements changed

    before

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    after

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

Showing up to 50 most recent observed changes.