{"id":"CVE-2023-53121","summary":"tcp: tcp_make_synack() can be called from process context","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: tcp_make_synack() can be called from process context\n\ntcp_rtx_synack() now could be called in process context as explained in\n0a375c822497 (\"tcp: tcp_rtx_synack() can be called from process\ncontext\").\n\ntcp_rtx_synack() might call tcp_make_synack(), which will touch per-CPU\nvariables with preemption enabled. This causes the following BUG:\n\n    BUG: using __this_cpu_add() in preemptible [00000000] code: ThriftIO1/5464\n    caller is tcp_make_synack+0x841/0xac0\n    Call Trace:\n     \u003cTASK\u003e\n     dump_stack_lvl+0x10d/0x1a0\n     check_preemption_disabled+0x104/0x110\n     tcp_make_synack+0x841/0xac0\n     tcp_v6_send_synack+0x5c/0x450\n     tcp_rtx_synack+0xeb/0x1f0\n     inet_rtx_syn_ack+0x34/0x60\n     tcp_check_req+0x3af/0x9e0\n     tcp_rcv_state_process+0x59b/0x2030\n     tcp_v6_do_rcv+0x5f5/0x700\n     release_sock+0x3a/0xf0\n     tcp_sendmsg+0x33/0x40\n     ____sys_sendmsg+0x2f2/0x490\n     __sys_sendmsg+0x184/0x230\n     do_syscall_64+0x3d/0x90\n\nAvoid calling __TCP_INC_STATS() with will touch per-cpu variables. Use\nTCP_INC_STATS() which is safe to be called from context switch.","modified":"2026-05-18T05:57:11.764581735Z","published":"2025-05-02T15:55:58.123Z","related":["SUSE-SU-2025:01983-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53121.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/442aa78ed70188b21ccd8669738448702c0a3281"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7613cde8c0c1f02a7ec2e1d536c01b65b135fc1c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/77ad58bca0119e8cc3e0e9d91a3f22caa66e4dfa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9180aa4622a720b433e842b4d3aa34d73eec577a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ad07290d63ff6689f50565b02f5b6f34ec15a5ca"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bced3f7db95ff2e6ca29dc4d1c9751ab5e736a09"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d493d4fe88195a144d6a277a90062a7534ed2192"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e23ca307745be3df7fe9762f3e2a7e311a57852e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53121.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53121"},{"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":"8336886f786fdacbc19b719c1f7ea91eb70706d4"},{"fixed":"d493d4fe88195a144d6a277a90062a7534ed2192"},{"fixed":"e23ca307745be3df7fe9762f3e2a7e311a57852e"},{"fixed":"442aa78ed70188b21ccd8669738448702c0a3281"},{"fixed":"77ad58bca0119e8cc3e0e9d91a3f22caa66e4dfa"},{"fixed":"ad07290d63ff6689f50565b02f5b6f34ec15a5ca"},{"fixed":"9180aa4622a720b433e842b4d3aa34d73eec577a"},{"fixed":"7613cde8c0c1f02a7ec2e1d536c01b65b135fc1c"},{"fixed":"bced3f7db95ff2e6ca29dc4d1c9751ab5e736a09"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53121.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.7.0"},{"fixed":"4.14.311"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.279"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.238"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.104"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.21"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.2.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53121.json"}}],"schema_version":"1.7.5"}