{"uuid": "7f71e8b8-8ea2-47a3-b226-389bc74aba7f", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-21670", "type": "published-proof-of-concept", "source": "https://t.me/DarkWebInformer_CVEAlerts/3656", "content": "\ud83d\udd17 DarkWebInformer.com - Cyber Threat Intelligence\n\ud83d\udccc CVE ID: CVE-2025-21670\n\ud83d\udd25 CVSS Score: N/A\n\ud83d\udd39 Description: In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/bpf: return early if transport is not assigned\n\nSome of the core functions can only be called if the transport\nhas been assigned.\n\nAs Michal reported, a socket might have the transport at NULL,\nfor example after a failed connect(), causing the following trace:\n\n    BUG: kernel NULL pointer dereference, address: 00000000000000a0\n    #PF: supervisor read access in kernel mode\n    #PF: error_code(0x0000) - not-present page\n    PGD 12faf8067 P4D 12faf8067 PUD 113670067 PMD 0\n    Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI\n    CPU: 15 UID: 0 PID: 1198 Comm: a.out Not tainted 6.13.0-rc2+\n    RIP: 0010:vsock_connectible_has_data+0x1f/0x40\n    Call Trace:\n     vsock_bpf_recvmsg+0xca/0x5e0\n     sock_recvmsg+0xb9/0xc0\n     __sys_recvfrom+0xb3/0x130\n     __x64_sys_recvfrom+0x20/0x30\n     do_syscall_64+0x93/0x180\n     entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nSo we need to check the `vsk->transport` in vsock_bpf_recvmsg(),\nespecially for connected sockets (stream/seqpacket) as we already\ndo in __vsock_connectible_recvmsg().\n\ud83d\udccf Published: 2025-01-31T12:33:02Z\n\ud83d\udccf Modified: 2025-01-31T12:33:02Z\n\ud83d\udd17 References:\n1. https://nvd.nist.gov/vuln/detail/CVE-2025-21670\n2. https://git.kernel.org/stable/c/58e586c30d0b6f5dc0174a41026f2b0a48c9aab6\n3. https://git.kernel.org/stable/c/6771e1279dadf1d92a72e1465134257d9e6f2459\n4. https://git.kernel.org/stable/c/f6abafcd32f9cfc4b1a2f820ecea70773e26d423", "creation_timestamp": "2025-01-31T13:15:09.000000Z"}