Medium 5.5Published May 1, 2026

CVE-2026-31736net: ethernet: mtk_ppe: avoid NULL deref when gmac0 is disabled

Updated under an hour ago (Oct 27, 2026, 4:30 PM ET)

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Exploited in the last 30 days

In 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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	73cfd947dbdb25ef9863ac49c4596a7d53ad4025 builds before 0b832aad33e6f160fda310f0306a6483d85e9d6e; 73cfd947dbdb25ef9863ac49c4596a7d53ad4025 builds before 5dff799c677152dde963c3917bacd9127b03e145; 73cfd947dbdb25ef9863ac49c4596a7d53ad4025 builds before 7b2380f0a0e374010c1a4a13203511b9dee5b166; from 73cfd947dbdb25ef9863ac49c4596a7d53ad4025 before 976ff48c2ac6e6b25b01428c9d7997bcd0fb2949	CNA record
linux linux_kernel linux:linux_kernel	from 6.11 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; 7.0; 7.0; 7.0; 7.0; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/0b832aad33e6f160fda310f0306a6483d85e9d6e	patch
https://git.kernel.org/stable/c/5dff799c677152dde963c3917bacd9127b03e145	patch
https://git.kernel.org/stable/c/7b2380f0a0e374010c1a4a13203511b9dee5b166	patch
https://git.kernel.org/stable/c/976ff48c2ac6e6b25b01428c9d7997bcd0fb2949	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.