{ "affected": [ { "ranges": [ { "events": [ { "introduced": "91b8534fa8f5e01f249b1bf8df0a2540053549ad" }, { "fixed": "378481cc60a937ef8ea4ef6e4f95f0dbc4e21414" }, { "fixed": "4f621ae3a2d99b0bac50e8d66cbf7f68323c01e8" }, { "fixed": "f62a1f245a71680033260a6f6d74011cc3acb3cd" }, { "fixed": "dc892cbb1e4341d427b1f940ebd6abd69bf8e479" }, { "fixed": "a8874c34c4a973f9922908a4b8be1d1278f01e42" }, { "fixed": "823886a1b089b49bcd349bc8bd3417b7910cd1ac" }, { "fixed": "6b4f48728faa8bb514368f7eacda05565dea8696" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" } ] }, { "package": { "ecosystem": "Linux", "name": "Kernel" }, "ranges": [ { "events": [ { "introduced": "2.6.28" }, { "fixed": "5.15.212" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "5.16.0" }, { "fixed": "6.1.178" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.2.0" }, { "fixed": "6.6.145" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.7.0" }, { "fixed": "6.12.97" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.13.0" }, { "fixed": "6.18.40" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.19.0" }, { "fixed": "7.1.5" } ], "type": "ECOSYSTEM" } ] } ], "database_specific": { "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72166.json" }, "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: fix infinite loop in p9_client_rpc on fatal signal\n\nWhen p9_client_rpc() is called with type P9_TFLUSH and the transport\nhas no peer (e.g. fd transport backed by pipes with no 9p server),\na fatal signal causes an infinite loop:\n\n again:\n\terr = io_wait_event_killable(req-\u003ewq, ...)\n\t/* SIGKILL wakes the task, returns -ERESTARTSYS */\n\n\tif (err == -ERESTARTSYS \u0026\u0026 c-\u003estatus == Connected \u0026\u0026\n\t\ttype == P9_TFLUSH) {\n\t\tsigpending = 1;\n\t\tclear_thread_flag(TIF_SIGPENDING);\n\t\tgoto again;\n\t}\n\nclear_thread_flag() clears TIF_SIGPENDING before jumping back to\nio_wait_event_killable(). signal_pending_state() checks TIF_SIGPENDING,\nfinds it zero, and the task goes to sleep again. The task can only wake\non the next signal delivery that calls signal_wake_up() and sets\nTIF_SIGPENDING again. When that happens the loop repeats, clears\nTIF_SIGPENDING, and sleeps again indefinitely.\n\nThis is triggered in practice by coredump_wait(): when a thread in a\nmulti-threaded process causes a coredump (e.g. via SIGSYS from Syscall\nUser Dispatch), coredump_wait() sends SIGKILL to all other threads and\nwaits for them to call mm_release(). If one of those threads is blocked\nin p9_client_rpc() over an fd transport with no peer, it enters the\nP9_TFLUSH loop and never calls mm_release(), so coredump_wait() stalls\nforever:\n\nINFO: task syz.0.18:676 blocked for more than 143 seconds.\n Not tainted 6.12.77+ #1\ntask:syz.0.18 state:D stack:27600 pid:676 tgid:673 ppid:630 flags:0x00000004\nCall Trace:\n \u003cTASK\u003e\n context_switch kernel/sched/core.c:5344 [inline]\n __schedule+0xcb4/0x5d50 kernel/sched/core.c:6724\n __schedule_loop kernel/sched/core.c:6801 [inline]\n schedule+0xe5/0x350 kernel/sched/core.c:6816\n schedule_timeout+0x253/0x290 kernel/time/timer.c:2593\n do_wait_for_common kernel/sched/completion.c:95 [inline]\n __wait_for_common+0x409/0x600 kernel/sched/completion.c:116\n wait_for_common kernel/sched/completion.c:127 [inline]\n wait_for_completion_state+0x1d/0x40 kernel/sched/completion.c:264\n coredump_wait fs/coredump.c:448 [inline]\n do_coredump+0x854/0x4350 fs/coredump.c:629\n get_signal+0x1425/0x2730 kernel/signal.c:2903\n arch_do_signal_or_restart+0x81/0x880 arch/x86/kernel/signal.c:337\n exit_to_user_mode_loop kernel/entry/common.c:111 [inline]\n exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]\n __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]\n syscall_exit_to_user_mode+0xf9/0x160 kernel/entry/common.c:218\n do_syscall_64+0x102/0x220 arch/x86/entry/common.c:84\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \u003c/TASK\u003e\n\nFix: check fatal_signal_pending() before clearing TIF_SIGPENDING in the\nP9_TFLUSH retry loop. At that point TIF_SIGPENDING is still set, so\nfatal_signal_pending() works correctly. If a fatal signal is pending,\njump to recalc_sigpending to restore TIF_SIGPENDING and return\n-ERESTARTSYS to the caller.\n\nThe same defect is present in stable kernels back to 5.4. On those\nkernels the infinite loop is broken earlier by a second SIGKILL from\nthe parent process (e.g. kill_and_wait() retrying after a timeout),\nresulting in a zombie process and a shutdown delay rather than a\npermanent D-state hang, but the underlying flaw is the same.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.", "id": "CVE-2026-72166", "modified": "2026-08-18T03:30:50.425246539Z", "published": "2026-08-15T05:53:33.383Z", "references": [ { "type": "WEB", "url": "https://git.kernel.org/stable/c/378481cc60a937ef8ea4ef6e4f95f0dbc4e21414" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/4f621ae3a2d99b0bac50e8d66cbf7f68323c01e8" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/6b4f48728faa8bb514368f7eacda05565dea8696" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/823886a1b089b49bcd349bc8bd3417b7910cd1ac" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/a8874c34c4a973f9922908a4b8be1d1278f01e42" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/dc892cbb1e4341d427b1f940ebd6abd69bf8e479" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/f62a1f245a71680033260a6f6d74011cc3acb3cd" }, { "type": "ADVISORY", "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72166.json" }, { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72166" }, { "type": "PACKAGE", "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git" } ], "schema_version": "1.9.0", "summary": "net/9p: fix infinite loop in p9_client_rpc on fatal signal" }