{"id":"CVE-2022-48906","summary":"mptcp: Correctly set DATA_FIN timeout when number of retransmits is large","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: Correctly set DATA_FIN timeout when number of retransmits is large\n\nSyzkaller with UBSAN uncovered a scenario where a large number of\nDATA_FIN retransmits caused a shift-out-of-bounds in the DATA_FIN\ntimeout calculation:\n\n================================================================================\nUBSAN: shift-out-of-bounds in net/mptcp/protocol.c:470:29\nshift exponent 32 is too large for 32-bit type 'unsigned int'\nCPU: 1 PID: 13059 Comm: kworker/1:0 Not tainted 5.17.0-rc2-00630-g5fbf21c90c60 #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014\nWorkqueue: events mptcp_worker\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n ubsan_epilogue+0xb/0x5a lib/ubsan.c:151\n __ubsan_handle_shift_out_of_bounds.cold+0xb2/0x20e lib/ubsan.c:330\n mptcp_set_datafin_timeout net/mptcp/protocol.c:470 [inline]\n __mptcp_retrans.cold+0x72/0x77 net/mptcp/protocol.c:2445\n mptcp_worker+0x58a/0xa70 net/mptcp/protocol.c:2528\n process_one_work+0x9df/0x16d0 kernel/workqueue.c:2307\n worker_thread+0x95/0xe10 kernel/workqueue.c:2454\n kthread+0x2f4/0x3b0 kernel/kthread.c:377\n ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295\n \u003c/TASK\u003e\n================================================================================\n\nThis change limits the maximum timeout by limiting the size of the\nshift, which keeps all intermediate values in-bounds.","modified":"2026-04-02T08:27:08.054206Z","published":"2024-08-22T01:30:40.850Z","related":["SUSE-SU-2024:3190-1","SUSE-SU-2024:3209-1","SUSE-SU-2024:3483-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48906.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/03ae283bd71f761feae3f402668d698b393b0e79"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0c3f34beb459753f9f80d0cc14c1b50ab615c631"},{"type":"WEB","url":"https://git.kernel.org/stable/c/877d11f0332cd2160e19e3313e262754c321fa36"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48906.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-48906"},{"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":"6477dd39e62c3a67cfa368ddc127410b4ae424c6"},{"fixed":"0c3f34beb459753f9f80d0cc14c1b50ab615c631"},{"fixed":"03ae283bd71f761feae3f402668d698b393b0e79"},{"fixed":"877d11f0332cd2160e19e3313e262754c321fa36"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"0af76111c2a6326e4bb56f64a6e453c6ec6dd2da"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48906.json"}}],"schema_version":"1.7.5"}