{"cve":"CVE-2026-53075","nvd":{"published":"2026-06-24T17:17:21.450","modified":"2026-10-19T20:18:58.467","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-863"],"references":["https://git.kernel.org/stable/c/1a8a51ce85075a56a743b6f142606dd2696a391c","https://git.kernel.org/stable/c/2bb6379416fd19f44c3423a00bfd8626259f6067","https://git.kernel.org/stable/c/3b2c2157dc2afc5c17cd7238afefca92f1ef330e","https://git.kernel.org/stable/c/5013be175c7ffd8b39efbc3c9c4db5b10b85fea8","https://git.kernel.org/stable/c/5080e188c914110034bbc569d5cfa2f06204681d"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2026-53075","score":0.00273,"percentile":0.19474,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}