{"id":"CVE-2026-90065","summary":"net/smc: release the internal TCP sock on IPPROTO_SMC socket creation failure","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: release the internal TCP sock on IPPROTO_SMC socket creation failure\n\nIPPROTO_SMC sockets create an internal TCP sock (\"clcsock\") from the\nproto-\u003einit hook. When socket creation fails after proto-\u003einit has\nrun - e.g. a cgroup BPF program attached to BPF_CGROUP_INET_SOCK_CREATE\ndenies the socket - sk_common_release() only invokes sk_prot-\u003edestroy\nif it is set, but neither smc_inet_prot nor smc_inet6_prot defines it,\nand smc_destruct() returns early unless sk_state is SMC_CLOSED. As a\nresult, every failing socket(AF_INET, SOCK_STREAM, IPPROTO_SMC) call\nleaks one tcp_sock, so an unprivileged task able to attach a deny-all\nBPF_CGROUP_INET_SOCK_CREATE program to its own cgroup can grow kernel\nmemory unboundedly.\n\nAdd a .destroy hook to both protos that releases the clcsock via\nsmc_clcsock_release(). smc_sk_init() hashes the sock into the smc\nhashinfo before the clcsock is created, and smc_diag dumps walk that\nhash dereferencing smc-\u003eclcsock without taking clcsock_release_lock,\nwhile sk_common_release() calls .destroy before .unhash. Unhash the\nsock before releasing the clcsock, as __smc_release() does, so a\nconcurrent dump cannot observe the release; the second unhash in\nsk_common_release() is a no-op.","modified":"2026-09-19T03:47:31.017165836Z","published":"2026-09-17T16:05:48.269Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90065.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2f4ece7fed6d915ec64b7735962c0d84d6261032"},{"type":"WEB","url":"https://git.kernel.org/stable/c/84180988a455fd8e147c6b35c8df65d8b8cc76c2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/94a913cd521c0f0408820bcdbd80dadf076d97b5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cec261b0b4c5c0b044165303198d10ffcdf3414c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90065.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90065"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d25a92ccae6bed02327b63d138e12e7806830f78"},{"fixed":"2f4ece7fed6d915ec64b7735962c0d84d6261032"},{"fixed":"84180988a455fd8e147c6b35c8df65d8b8cc76c2"},{"fixed":"94a913cd521c0f0408820bcdbd80dadf076d97b5"},{"fixed":"cec261b0b4c5c0b044165303198d10ffcdf3414c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90065.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.11.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90065.json"}}],"schema_version":"1.9.0"}