{"id":"CVE-2026-90077","state":"PUBLISHED","title":"net: fix a resource leak in copy_net_ns() error handling path","description":"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 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.","publishedAt":"2026-09-17T16:05:56.226Z","updatedAt":"2026-10-19T08:57:33.991Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"08027f6b790be1e444e4182fb4dc53faa6539d16","status":"affected","lessThan":"76c847e80d2b6be047707d58e8e05eedbe2593ad","versionType":"git"},{"version":"08027f6b790be1e444e4182fb4dc53faa6539d16","status":"affected","lessThan":"e69bde4eb566aea8fa97cbb93e0bab608964f1a5","versionType":"git"},{"version":"08027f6b790be1e444e4182fb4dc53faa6539d16","status":"affected","lessThan":"3220b62fbb8a55feebd2a826d5ead0f49f09ed5a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/net_namespace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/net_namespace.c"]}],"references":["https://git.kernel.org/stable/c/76c847e80d2b6be047707d58e8e05eedbe2593ad","https://git.kernel.org/stable/c/e69bde4eb566aea8fa97cbb93e0bab608964f1a5","https://git.kernel.org/stable/c/3220b62fbb8a55feebd2a826d5ead0f49f09ed5a"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90077.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90077","state":"PUBLISHED","datePublished":"2026-09-17T16:05:56.226Z","dateUpdated":"2026-10-19T08:57:33.991Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.785Z"},"containers":{"cna":{"title":"net: fix a resource leak in copy_net_ns() error handling path","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"08027f6b790be1e444e4182fb4dc53faa6539d16","status":"affected","lessThan":"76c847e80d2b6be047707d58e8e05eedbe2593ad","versionType":"git"},{"version":"08027f6b790be1e444e4182fb4dc53faa6539d16","status":"affected","lessThan":"e69bde4eb566aea8fa97cbb93e0bab608964f1a5","versionType":"git"},{"version":"08027f6b790be1e444e4182fb4dc53faa6539d16","status":"affected","lessThan":"3220b62fbb8a55feebd2a826d5ead0f49f09ed5a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/net_namespace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/net_namespace.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/76c847e80d2b6be047707d58e8e05eedbe2593ad"},{"url":"https://git.kernel.org/stable/c/e69bde4eb566aea8fa97cbb93e0bab608964f1a5"},{"url":"https://git.kernel.org/stable/c/3220b62fbb8a55feebd2a826d5ead0f49f09ed5a"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:57:33.991Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}