{"id":"CVE-2025-21670","summary":"vsock/bpf: return early if transport is not assigned","details":"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-\u003etransport` in vsock_bpf_recvmsg(),\nespecially for connected sockets (stream/seqpacket) as we already\ndo in __vsock_connectible_recvmsg().","modified":"2026-04-02T12:35:20.638743Z","published":"2025-01-31T11:25:33.874Z","related":["SUSE-SU-2025:0499-1","SUSE-SU-2025:0557-1","SUSE-SU-2025:0564-1","SUSE-SU-2025:0847-1","SUSE-SU-2025:20190-1","SUSE-SU-2025:20192-1","SUSE-SU-2025:20260-1","SUSE-SU-2025:20270-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21670.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/58e586c30d0b6f5dc0174a41026f2b0a48c9aab6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6771e1279dadf1d92a72e1465134257d9e6f2459"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f6abafcd32f9cfc4b1a2f820ecea70773e26d423"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21670.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21670"},{"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":"634f1a7110b439c65fd8a809171c1d2d28bcea6f"},{"fixed":"58e586c30d0b6f5dc0174a41026f2b0a48c9aab6"},{"fixed":"6771e1279dadf1d92a72e1465134257d9e6f2459"},{"fixed":"f6abafcd32f9cfc4b1a2f820ecea70773e26d423"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21670.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}