net: ethernet: mtk_ppe: avoid NULL deref when gmac0 is disabled

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Summary

CVECVE-2026-31736
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:36 UTC
Updated2026-05-07 16:53:14 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: ethernet: mtk_ppe: avoid NULL deref when gmac0 is disabled If the gmac0 is disabled, the precheck for a valid ingress device will cause a NULL pointer deref and crash the system. This happens because eth->netdev[0] will be NULL but the code will directly try to access netdev_ops. Instead of just checking for the first net_device, it must be checked if any of the mtk_eth net_devices is matching the netdev_ops of the ingress device.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000180000 probability, percentile 0.046430000 (date 2026-05-05)

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 73cfd947dbdb25ef9863ac49c4596a7d53ad4025 0b832aad33e6f160fda310f0306a6483d85e9d6e git Not specified
CNA Linux Linux affected 73cfd947dbdb25ef9863ac49c4596a7d53ad4025 5dff799c677152dde963c3917bacd9127b03e145 git Not specified
CNA Linux Linux affected 73cfd947dbdb25ef9863ac49c4596a7d53ad4025 7b2380f0a0e374010c1a4a13203511b9dee5b166 git Not specified
CNA Linux Linux affected 73cfd947dbdb25ef9863ac49c4596a7d53ad4025 976ff48c2ac6e6b25b01428c9d7997bcd0fb2949 git Not specified
CNA Linux Linux affected 6.11 Not specified
CNA Linux Linux unaffected 6.11 semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5dff799c677152dde963c3917bacd9127b03e145 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0b832aad33e6f160fda310f0306a6483d85e9d6e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/976ff48c2ac6e6b25b01428c9d7997bcd0fb2949 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7b2380f0a0e374010c1a4a13203511b9dee5b166 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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