{"id":"CVE-2026-98027","revision":"9a85e9907c354d169a723eb3e2031f1b","records":[{"revision":"9a85e9907c354d169a723eb3e2031f1b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98027","aliases":[],"title":"net: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size\n\nmv88e6xxx_get_rxnfc() uses rxnfc->rule_cnt as the write index while\ndumping the policy IDR, clobbering the input value before it has been\nlooked at.  That input is the number of entries the caller had room for.\nETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN and the ioctl sizes the\nbuffer from the rule_cnt userspace passes in, so once an admin has\ninstalled policy rules any user can ask for fewer slots than there are\nrules and run off the end of the allocation.  A rule_cnt of 0 leaves the\nbuffer pointer NULL and the walk dereferences it.\n\nCount into a local so the caller's limit survives the walk, and stop with\n-EMSGSIZE once it is reached.","state":0,"publishedAt":"2026-09-25T10:23:45.123+00:00","modifiedAt":"2026-10-19T09:12:32.331+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/dsa/mv88e6xxx/chip.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"da7dc87553046a43be1620a783ce3d9f6583d322\",\n                            \"lessThan\": \"7e4bfc5f0b66feb22cba821303fc25ca22cd0887\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"da7dc87553046a43be1620a783ce3d9f6583d322\",\n                            \"lessThan\": \"01124cd2cf4b71755b1130ac82d78dcfbd5d69e3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"da7dc87553046a43be1620a783ce3d9f6583d322\",\n                            \"lessThan\": \"609c4378f212cf580aae02250f1146caf63d873f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"da7dc87553046a43be1620a783ce3d9f6583d322\",\n                            \"lessThan\": \"c5b5c52b6524c9fb50def2260baac745c095ec3a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"da7dc87553046a43be1620a783ce3d9f6583d322\",\n                            \"lessThan\": \"44cd4674d9aa5bdf793b8a8b481c9e8536ed6070\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"da7dc87553046a43be1620a783ce3d9f6583d322\",\n                            \"lessThan\": \"7a683c2b062810bca203e41866389daf387c235b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"da7dc87553046a43be1620a783ce3d9f6583d322\",\n                            \"lessThan\": \"cda5ac8fe8ac8e80b1703ebb8c4250726fc19739\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"da7dc87553046a43be1620a783ce3d9f6583d322\",\n                            \"lessThan\": \"b1fffc273112e7284c5b705e186b43b5770cd3d5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/dsa/mv88e6xxx/chip.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.4\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.4\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/7e4bfc5f0b66feb22cba821303fc25ca22cd0887","https://git.kernel.org/stable/c/01124cd2cf4b71755b1130ac82d78dcfbd5d69e3","https://git.kernel.org/stable/c/609c4378f212cf580aae02250f1146caf63d873f","https://git.kernel.org/stable/c/c5b5c52b6524c9fb50def2260baac745c095ec3a","https://git.kernel.org/stable/c/44cd4674d9aa5bdf793b8a8b481c9e8536ed6070","https://git.kernel.org/stable/c/7a683c2b062810bca203e41866389daf387c235b","https://git.kernel.org/stable/c/cda5ac8fe8ac8e80b1703ebb8c4250726fc19739","https://git.kernel.org/stable/c/b1fffc273112e7284c5b705e186b43b5770cd3d5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98027","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98027","identifiers":["CVE-2026-98027"]},"retained":false,"historicalAffected":[]}],"coverage":[]}