{"cve":"CVE-2023-53121","nvd":{"published":"2025-05-02T16:15:31.173","modified":"2026-06-17T06:44:20.367","status":"Analyzed","description":"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     <TASK>\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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/442aa78ed70188b21ccd8669738448702c0a3281","https://git.kernel.org/stable/c/7613cde8c0c1f02a7ec2e1d536c01b65b135fc1c","https://git.kernel.org/stable/c/77ad58bca0119e8cc3e0e9d91a3f22caa66e4dfa","https://git.kernel.org/stable/c/9180aa4622a720b433e842b4d3aa34d73eec577a","https://git.kernel.org/stable/c/ad07290d63ff6689f50565b02f5b6f34ec15a5ca"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:01:22.920403922+00:00"},"epss":{"cve":"CVE-2023-53121","score":0.00189,"percentile":0.08516,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}