bpf, sockmap: Take state lock for af_unix iter_CVE-2026-53033

{
    "lastseen": "",
    "description": "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 `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",
    "published": "2026-06-24T16:29:40.794Z",
    "modified": "2026-06-28T06:38:18.830Z",
    "type": "cve",
    "title": "bpf, sockmap: Take state lock for af_unix iter",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/c6f4015eac2e3cbc3cb7a17539e10bbb5c2049c3\nhttps://git.kernel.org/stable/c/d0d124dbcef9318e326956137b31671407094bd4\nhttps://git.kernel.org/stable/c/1a59cc6b65fd3ad9915aae5970d859109d4ce9fb\nhttps://git.kernel.org/stable/c/921920c34cb591947dd30c692500795a69f1e3fa\nhttps://git.kernel.org/stable/c/98f744d204e5d6fca589cd2c44c3190a0c71697f\nhttps://git.kernel.org/stable/c/64c2f93fc3254d3bf5de4445fb732ee5c451edb6",
    "id": "CVE-2026-53033",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 2c860a43dd77f969bb959336a2f743d7103a8f63\nLinux Linux 2c860a43dd77f969bb959336a2f743d7103a8f63\nLinux Linux 2c860a43dd77f969bb959336a2f743d7103a8f63\nLinux Linux 2c860a43dd77f969bb959336a2f743d7103a8f63\nLinux Linux 2c860a43dd77f969bb959336a2f743d7103a8f63\nLinux Linux 2c860a43dd77f969bb959336a2f743d7103a8f63\nLinux Linux 5.15",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "2c860a43dd77f969bb959336a2f743d7103a8f63",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}