{"id":"CVE-2026-64575","published":"2026-08-05T08:16:37.363","lastModified":"2026-08-08T15:16:32.410","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: tcp: fix double sock release on batch realloc\n\nbpf_iter_tcp_batch() releases the current batch via\nbpf_iter_tcp_put_batch(), which drops the socket refs and rewrites\neach slot with the socket cookie, then grows the batch. cur_sk/end_sk\nare kept for bpf_iter_tcp_resume(), but on realloc failure the function\nreturns ERR_PTR() before resume runs, leaving cur_sk < end_sk over\nslots that now hold cookies rather than sock pointers.\nbpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and\ndereferences a cookie as a struct sock.\n\nEmpty the batch on the failure path so stop() does not release it\nagain. The sockets were already freed by the first\nbpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans\nthe bucket from the start instead of skipping it. The sibling\nGFP_NOWAIT failure path still holds real socket references and is left\nfor stop() to release.\n\n  BUG: KASAN: null-ptr-deref in __sock_gen_cookie\n  Read of size 8 at addr 0000000000000059 by task exploit\n   ...\n   __sock_gen_cookie (net/core/sock_diag.c:28)\n   bpf_iter_tcp_put_batch (net/ipv4/tcp_ipv4.c:2918)\n   bpf_iter_tcp_seq_stop (net/ipv4/tcp_ipv4.c:3270)\n   bpf_seq_read (kernel/bpf/bpf_iter.c:205)\n   vfs_read (fs/read_write.c:572)\n   ksys_read (fs/read_write.c:716)\n   do_syscall_64\n   entry_SYSCALL_64_after_hwframe\n  Kernel panic - not syncing: Fatal exception","cvssScore":7.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/8a726e9585ffe7bfbfad2b5279277a00973970f3","tags":[]},{"url":"https://git.kernel.org/stable/c/980a813452754f8001704744e92f7aa697c53dd3","tags":[]},{"url":"https://git.kernel.org/stable/c/9f27c4f0ae35b5390ce4f7a54d3501144e41a54d","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"The vulnerability allows for a null pointer dereference in the Linux kernel's bpf_iter_tcp_batch function, which can lead to potential system instability or crashes.","exploitability":"Exploitation requires specific conditions and kernel-level access; it is moderately difficult due to the need for precise timing and environment setup.","blast_radius":"If exploited, this could impact the stability of the affected Linux systems, potentially leading to Denial of Service (DoS) scenarios.","remediation":"Update to the latest patched version of the Linux kernel as soon as possible.","tags":["kernel","dos","stability"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-08-11T06:52:26.238Z"}}