{"id":"CVE-2026-90077","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix a resource leak in copy_net_ns() error handling path\n\nCurrently, preinit_net() does two things:\n\n  (1) call ns_common_init() which might fail\n  (2) initialize …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix a resource leak in copy_net_ns() error handling path\n\nCurrently, preinit_net() does two things:\n\n  (1) call ns_common_init() which might fail\n  (2) initialize …","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 08027f6b790be1e444e4182fb4dc53faa6539d16 < 76c847e80d2b6be047707d58e8e05eedbe2593ad","Linux >= 08027f6b790be1e444e4182fb4dc53faa6539d16 < e69bde4eb566aea8fa97cbb93e0bab608964f1a5","Linux >= 08027f6b790be1e444e4182fb4dc53faa6539d16 < 3220b62fbb8a55feebd2a826d5ead0f49f09ed5a","Linux 6.18"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:16:56.930","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90077","references":[{"url":"https://git.kernel.org/stable/c/3220b62fbb8a55feebd2a826d5ead0f49f09ed5a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/76c847e80d2b6be047707d58e8e05eedbe2593ad","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e69bde4eb566aea8fa97cbb93e0bab608964f1a5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90077.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90077"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536458"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90077"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90077"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90077.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-17T16:21:47.896Z","epss":0.00206,"epssPercentile":0.10642,"cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-772"],"slug":"CVE-2026-90077","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix a resource leak in copy_net_ns() error handling path\n\nCurrently, preinit_net() does two things:\n\n  (1) call ns_common_init() which might fail\n  (2) initialize resources which does not fail\n\nHowever, preinit_net() is returning early when (1) fails, and copy_net_ns()\nis jumping to the dec_ucounts: label. As a result, resources allocated by\nnet_alloc() are leaking. We need to call key_remove_domain() and\nnet_passive_dec() in order to release resources allocated by net_alloc().\n\nWe cannot simply jump to the put_userns: label when preinit_net() failed,\nfor (2) is not yet done. But we can reorder (1) and (2), for there is no\ndependency between (1) and (2). Therefore, this patch decouples (1) from\npreinit_net() and changes preinit_net() back to a void function, and calls\nns_common_init() after preinit_net() succeeded. Then, we can jump to\nimmediately after ns_common_free() of the put_userns: label.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-05 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90077.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":216290,"id":"CVE-2026-90077","ts":1791274065955,"field":"cvss","old":null,"new":"5.5"},{"seq":216289,"id":"CVE-2026-90077","ts":1791274065955,"field":"severity","old":"none","new":"medium"}]}