{"id":"CVE-2026-53075","revision":"1b7e2be28409455abdf52be3a938495c","records":[{"revision":"1b7e2be28409455abdf52be3a938495c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53075","aliases":[],"title":"ppp: require CAP_NET_ADMIN in target netns for unattached ioctls","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nppp: require CAP_NET_ADMIN in target netns for unattached ioctls\n\n/dev/ppp open is currently authorized against file->f_cred->user_ns,\nwhile unattached administrative ioctls operate on current->nsproxy->net_ns.\n\nAs a result, a local unprivileged user can create a new user namespace\nwith CLONE_NEWUSER, gain CAP_NET_ADMIN only in that new user namespace,\nand still issue PPPIOCNEWUNIT, PPPIOCATTACH, or PPPIOCATTCHAN against\nan inherited network namespace.\n\nRequire CAP_NET_ADMIN in the user namespace that owns the target network\nnamespace before handling unattached PPP administrative ioctls.\n\nThis preserves normal pppd operation in the network namespace it is\nactually privileged in, while rejecting the userns-only inherited-netns\ncase.","state":0,"publishedAt":"2026-06-24T16:30:16.214+00:00","modifiedAt":"2026-10-19T19:47:15.461+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/ppp/ppp_generic.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"273ec51dd7ceaa76e038875d85061ec856d8905e\",\n                            \"lessThan\": \"c9edd90c57ae23692fff6b049fdfa4572a9fd532\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"273ec51dd7ceaa76e038875d85061ec856d8905e\",\n                            \"lessThan\": \"5080e188c914110034bbc569d5cfa2f06204681d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"273ec51dd7ceaa76e038875d85061ec856d8905e\",\n                            \"lessThan\": \"67e901e28d177ac9a9bed76d69ce3471e704a89e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"273ec51dd7ceaa76e038875d85061ec856d8905e\",\n                            \"lessThan\": \"954745d0223e7caec917c0b2d1a889ff56fa6e54\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"273ec51dd7ceaa76e038875d85061ec856d8905e\",\n                            \"lessThan\": \"3b2c2157dc2afc5c17cd7238afefca92f1ef330e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"273ec51dd7ceaa76e038875d85061ec856d8905e\",\n                            \"lessThan\": \"5013be175c7ffd8b39efbc3c9c4db5b10b85fea8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"273ec51dd7ceaa76e038875d85061ec856d8905e\",\n                            \"lessThan\": \"1a8a51ce85075a56a743b6f142606dd2696a391c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"273ec51dd7ceaa76e038875d85061ec856d8905e\",\n                            \"lessThan\": \"2bb6379416fd19f44c3423a00bfd8626259f6067\",\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/ppp/ppp_generic.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.30\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.30\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.258\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.209\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.141\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.91\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.33\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.10\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\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:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/c9edd90c57ae23692fff6b049fdfa4572a9fd532","https://git.kernel.org/stable/c/5080e188c914110034bbc569d5cfa2f06204681d","https://git.kernel.org/stable/c/67e901e28d177ac9a9bed76d69ce3471e704a89e","https://git.kernel.org/stable/c/954745d0223e7caec917c0b2d1a889ff56fa6e54","https://git.kernel.org/stable/c/3b2c2157dc2afc5c17cd7238afefca92f1ef330e","https://git.kernel.org/stable/c/5013be175c7ffd8b39efbc3c9c4db5b10b85fea8","https://git.kernel.org/stable/c/1a8a51ce85075a56a743b6f142606dd2696a391c","https://git.kernel.org/stable/c/2bb6379416fd19f44c3423a00bfd8626259f6067"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53075","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53075","identifiers":["CVE-2026-53075"]},"retained":false,"historicalAffected":[]}],"coverage":[]}