{"id":"CVE-2026-53033","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Take state lock for af_unix iter\n\nWhen a BPF iterator program updates a sockmap, there is a race condition in\nunix_stream_bpf_update_proto() where the `pe…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Take state lock for af_unix iter\n\nWhen a BPF iterator program updates a sockmap, there is a race condition in\nunix_stream_bpf_update_proto() where the `pe…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-825"],"published":"2026-06-24","updated":"2026-07-06","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53033","references":[{"url":"https://git.kernel.org/stable/c/1a59cc6b65fd3ad9915aae5970d859109d4ce9fb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/64c2f93fc3254d3bf5de4445fb732ee5c451edb6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/921920c34cb591947dd30c692500795a69f1e3fa","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/98f744d204e5d6fca589cd2c44c3190a0c71697f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c6f4015eac2e3cbc3cb7a17539e10bbb5c2049c3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d0d124dbcef9318e326956137b31671407094bd4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://access.redhat.com/security/cve/CVE-2026-53033","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2492281","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53033.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}],"tags":["nvd"],"epss":0.00186,"epssPercentile":0.07287,"ingestedAt":"2026-07-06T17:44:51.214Z","slug":"CVE-2026-53033","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Take state lock for af_unix iter\n\nWhen a BPF iterator program updates a sockmap, there is a race condition in\nunix_stream_bpf_update_proto() where the `peer` pointer can become stale[1]\nduring a state transition TCP_ESTABLISHED -> TCP_CLOSE.\n\n        CPU0 bpf                          CPU1 close\n        --------                          ----------\n// unix_stream_bpf_update_proto()\nsk_pair = unix_peer(sk)\nif (unlikely(!sk_pair))\n   return -EINVAL;\n                                     // unix_release_sock()\n                                     skpair = unix_peer(sk);\n                                     unix_peer(sk) = NULL;\n                                     sock_put(skpair)\nsock_hold(sk_pair) // UaF\n\nMore practically, this fix guarantees that the iterator program is\nconsistently provided with a unix socket that remains stable during\niterator execution.\n\n[1]:\nBUG: KASAN: slab-use-after-free in unix_stream_bpf_update_proto+0x155/0x490\nWrite of size 4 at addr ffff8881178c9a00 by task test_progs/2231\nCall Trace:\n dump_stack_lvl+0x5d/0x80\n print_report+0x170/0x4f3\n kasan_report+0xe4/0x1c0\n kasan_check_range+0x125/0x200\n unix_stream_bpf_update_proto+0x155/0x490\n sock_map_link+0x71c/0xec0\n sock_map_update_common+0xbc/0x600\n sock_map_update_elem+0x19a/0x1f0\n bpf_prog_bbbf56096cdd4f01_selective_dump_unix+0x20c/0x217\n bpf_iter_run_prog+0x21e/0xae0\n bpf_iter_unix_seq_show+0x1e0/0x2a0\n bpf_seq_read+0x42c/0x10d0\n vfs_read+0x171/0xb20\n ksys_read+0xff/0x200\n do_syscall_64+0xf7/0x5e0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nAllocated by task 2236:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n __kasan_slab_alloc+0x63/0x80\n kmem_cache_alloc_noprof+0x1d5/0x680\n sk_prot_alloc+0x59/0x210\n sk_alloc+0x34/0x470\n unix_create1+0x86/0x8a0\n unix_stream_connect+0x318/0x15b0\n __sys_connect+0xfd/0x130\n __x64_sys_connect+0x72/0xd0\n do_syscall_64+0xf7/0x5e0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFreed by task 2236:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x70\n __kasan_slab_free+0x47/0x70\n kmem_cache_free+0x11c/0x590\n __sk_destruct+0x432/0x6e0\n unix_release_sock+0x9b3/0xf60\n unix_release+0x8a/0xf0\n __sock_release+0xb0/0x270\n sock_close+0x18/0x20\n __fput+0x36e/0xac0\n fput_close_sync+0xe5/0x1a0\n __x64_sys_close+0x7d/0xd0\n do_syscall_64+0xf7/0x5e0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}