{"id":"CVE-2026-31736","state":"PUBLISHED","title":"net: ethernet: mtk_ppe: avoid NULL deref when gmac0 is disabled","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethernet: mtk_ppe: avoid NULL deref when gmac0 is disabled\n\nIf the gmac0 is disabled, the precheck for a valid ingress device will\ncause a NULL pointer deref and crash the system. This happens because\neth->netdev[0] will be NULL but the code will directly try to access\nnetdev_ops.\n\nInstead of just checking for the first net_device, it must be checked if\nany of the mtk_eth net_devices is matching the netdev_ops of the ingress\ndevice.","publishedAt":"2026-05-01T14:14:33.583Z","updatedAt":"2026-05-11T22:14:45.998Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"73cfd947dbdb25ef9863ac49c4596a7d53ad4025","status":"affected","lessThan":"0b832aad33e6f160fda310f0306a6483d85e9d6e","versionType":"git"},{"version":"73cfd947dbdb25ef9863ac49c4596a7d53ad4025","status":"affected","lessThan":"5dff799c677152dde963c3917bacd9127b03e145","versionType":"git"},{"version":"73cfd947dbdb25ef9863ac49c4596a7d53ad4025","status":"affected","lessThan":"7b2380f0a0e374010c1a4a13203511b9dee5b166","versionType":"git"},{"version":"73cfd947dbdb25ef9863ac49c4596a7d53ad4025","status":"affected","lessThan":"976ff48c2ac6e6b25b01428c9d7997bcd0fb2949","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mediatek/mtk_ppe_offload.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.11","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mediatek/mtk_ppe_offload.c"]}],"references":["https://git.kernel.org/stable/c/0b832aad33e6f160fda310f0306a6483d85e9d6e","https://git.kernel.org/stable/c/5dff799c677152dde963c3917bacd9127b03e145","https://git.kernel.org/stable/c/7b2380f0a0e374010c1a4a13203511b9dee5b166","https://git.kernel.org/stable/c/976ff48c2ac6e6b25b01428c9d7997bcd0fb2949"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31736.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31736","state":"PUBLISHED","datePublished":"2026-05-01T14:14:33.583Z","dateUpdated":"2026-05-11T22:14:45.998Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.137Z"},"containers":{"cna":{"title":"net: ethernet: mtk_ppe: avoid NULL deref when gmac0 is disabled","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethernet: mtk_ppe: avoid NULL deref when gmac0 is disabled\n\nIf the gmac0 is disabled, the precheck for a valid ingress device will\ncause a NULL pointer deref and crash the system. This happens because\neth->netdev[0] will be NULL but the code will directly try to access\nnetdev_ops.\n\nInstead of just checking for the first net_device, it must be checked if\nany of the mtk_eth net_devices is matching the netdev_ops of the ingress\ndevice."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"73cfd947dbdb25ef9863ac49c4596a7d53ad4025","status":"affected","lessThan":"0b832aad33e6f160fda310f0306a6483d85e9d6e","versionType":"git"},{"version":"73cfd947dbdb25ef9863ac49c4596a7d53ad4025","status":"affected","lessThan":"5dff799c677152dde963c3917bacd9127b03e145","versionType":"git"},{"version":"73cfd947dbdb25ef9863ac49c4596a7d53ad4025","status":"affected","lessThan":"7b2380f0a0e374010c1a4a13203511b9dee5b166","versionType":"git"},{"version":"73cfd947dbdb25ef9863ac49c4596a7d53ad4025","status":"affected","lessThan":"976ff48c2ac6e6b25b01428c9d7997bcd0fb2949","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mediatek/mtk_ppe_offload.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.11","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mediatek/mtk_ppe_offload.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0b832aad33e6f160fda310f0306a6483d85e9d6e"},{"url":"https://git.kernel.org/stable/c/5dff799c677152dde963c3917bacd9127b03e145"},{"url":"https://git.kernel.org/stable/c/7b2380f0a0e374010c1a4a13203511b9dee5b166"},{"url":"https://git.kernel.org/stable/c/976ff48c2ac6e6b25b01428c9d7997bcd0fb2949"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:14:45.998Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}