{"id":"CVE-2026-53035","summary":"bpf, sockmap: Fix af_unix iter deadlock","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix af_unix iter deadlock\n\nbpf_iter_unix_seq_show() may deadlock when lock_sock_fast() takes the fast\npath and the iter prog attempts to update a sockmap. Which ends up spinning\nat sock_map_update_elem()'s bh_lock_sock():\n\nWARNING: possible recursive locking detected\ntest_progs/1393 is trying to acquire lock:\nffff88811ec25f58 (slock-AF_UNIX){+...}-{3:3}, at: sock_map_update_elem+0xdb/0x1f0\n\nbut task is already holding lock:\nffff88811ec25f58 (slock-AF_UNIX){+...}-{3:3}, at: __lock_sock_fast+0x37/0xe0\n\nother info that might help us debug this:\n Possible unsafe locking scenario:\n\n       CPU0\n       ----\n  lock(slock-AF_UNIX);\n  lock(slock-AF_UNIX);\n\n *** DEADLOCK ***\n\n May be due to missing lock nesting notation\n\n4 locks held by test_progs/1393:\n #0: ffff88814b59c790 (&p-\u003elock){+.+.}-{4:4}, at: bpf_seq_read+0x59/0x10d0\n #1: ffff88811ec25fd8 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: bpf_seq_read+0x42c/0x10d0\n #2: ffff88811ec25f58 (slock-AF_UNIX){+...}-{3:3}, at: __lock_sock_fast+0x37/0xe0\n #3: ffffffff85a6a7c0 (rcu_read_lock){....}-{1:3}, at: bpf_iter_run_prog+0x51d/0xb00\n\nCall Trace:\n dump_stack_lvl+0x5d/0x80\n print_deadlock_bug.cold+0xc0/0xce\n __lock_acquire+0x130f/0x2590\n lock_acquire+0x14e/0x2b0\n _raw_spin_lock+0x30/0x40\n sock_map_update_elem+0xdb/0x1f0\n bpf_prog_2d0075e5d9b721cd_dump_unix+0x55/0x4f4\n bpf_iter_run_prog+0x5b9/0xb00\n bpf_iter_unix_seq_show+0x1f7/0x2e0\n bpf_seq_read+0x42c/0x10d0\n vfs_read+0x171/0xb20\n ksys_read+0xff/0x200\n do_syscall_64+0x6b/0x3a0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e","modified":"2026-07-12T03:54:58.317264331Z","published":"2026-06-24T16:29:42.560Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53035.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3cef33b9813b78f227942572fb317afcd5c9ac94"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4d328dd695383224aa750ddee6b4ad40c0f8d205"},{"type":"WEB","url":"https://git.kernel.org/stable/c/527057ebe8076dfbcaef51195ff1b7508646be2c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/66d9fab4565eafe1afe7ba0581f79b76073b60fa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/87828b380956d4986f59f2c086e0b09b3e6cdaae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bd3592129f24243713673a07225cf1f15a9bb835"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53035.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53035"},{"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":"2c860a43dd77f969bb959336a2f743d7103a8f63"},{"fixed":"bd3592129f24243713673a07225cf1f15a9bb835"},{"fixed":"3cef33b9813b78f227942572fb317afcd5c9ac94"},{"fixed":"87828b380956d4986f59f2c086e0b09b3e6cdaae"},{"fixed":"527057ebe8076dfbcaef51195ff1b7508646be2c"},{"fixed":"66d9fab4565eafe1afe7ba0581f79b76073b60fa"},{"fixed":"4d328dd695383224aa750ddee6b4ad40c0f8d205"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53035.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.141"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.91"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.33"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53035.json"}}],"schema_version":"1.7.5"}