{ "data_version": "4.0", "data_type": "CVE", "data_format": "MITRE", "CVE_data_meta": { "ID": "CVE-2024-49946", "ASSIGNER": "cve@kernel.org", "STATE": "PUBLIC" }, "description": { "description_data": [ { "lang": "eng", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nppp: do not assume bh is held in ppp_channel_bridge_input()\n\nNetworking receive path is usually handled from BH handler.\nHowever, some protocols need to acquire the socket lock, and\npackets might be stored in the socket backlog is the socket was\nowned by a user process.\n\nIn this case, release_sock(), __release_sock(), and sk_backlog_rcv()\nmight call the sk->sk_backlog_rcv() handler in process context.\n\nsybot caught ppp was not considering this case in\nppp_channel_bridge_input() :\n\nWARNING: inconsistent lock state\n6.11.0-rc7-syzkaller-g5f5673607153 #0 Not tainted\n--------------------------------\ninconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.\nksoftirqd/1/24 [HC0[0]:SC1[1]:HE1:SE0] takes:\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304\n{SOFTIRQ-ON-W} state was registered at:\n lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5759\n __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]\n _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154\n spin_lock include/linux/spinlock.h:351 [inline]\n ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]\n ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304\n pppoe_rcv_core+0xfc/0x314 drivers/net/ppp/pppoe.c:379\n sk_backlog_rcv include/net/sock.h:1111 [inline]\n __release_sock+0x1a8/0x3d8 net/core/sock.c:3004\n release_sock+0x68/0x1b8 net/core/sock.c:3558\n pppoe_sendmsg+0xc8/0x5d8 drivers/net/ppp/pppoe.c:903\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg net/socket.c:745 [inline]\n __sys_sendto+0x374/0x4f4 net/socket.c:2204\n __do_sys_sendto net/socket.c:2216 [inline]\n __se_sys_sendto net/socket.c:2212 [inline]\n __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2212\n __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\n invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49\n el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132\n do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151\n el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712\n el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730\n el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\nirq event stamp: 282914\n hardirqs last enabled at (282914): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]\n hardirqs last enabled at (282914): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194\n hardirqs last disabled at (282913): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]\n hardirqs last disabled at (282913): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162\n softirqs last enabled at (282904): [] softirq_handle_end kernel/softirq.c:400 [inline]\n softirqs last enabled at (282904): [] handle_softirqs+0xa3c/0xbfc kernel/softirq.c:582\n softirqs last disabled at (282909): [] run_ksoftirqd+0x70/0x158 kernel/softirq.c:928\n\nother info that might help us debug this:\n Possible unsafe locking scenario:\n\n CPU0\n ----\n lock(&pch->downl);\n \n lock(&pch->downl);\n\n *** DEADLOCK ***\n\n1 lock held by ksoftirqd/1/24:\n #0: ffff80008f74dfa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:325\n\nstack backtrace:\nCPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.11.0-rc7-syzkaller-g5f5673607153 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\nCall trace:\n dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:319\n show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:326\n __dump_sta\n---truncated---" } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "n/a" } ] } ] }, "affects": { "vendor": { "vendor_data": [ { "vendor_name": "Linux", "product": { "product_data": [ { "product_name": "Linux", "version": { "version_data": [ { "version_affected": "<", "version_name": "4cf476ced45d", "version_value": "176dd41e8c2b" }, { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "5.11", "status": "affected" }, { "version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "custom" }, { "version": "5.15.168", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.1.113", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.6.55", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.10.14", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.11.3", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.12-rc2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ], "defaultStatus": "affected" } } ] } } ] } } ] } }, "references": { "reference_data": [ { "url": "https://git.kernel.org/stable/c/176dd41e8c2bd997ed3d66568a3362e69ecce99b", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/176dd41e8c2bd997ed3d66568a3362e69ecce99b" }, { "url": "https://git.kernel.org/stable/c/635deca1800a68624f185dc1e04a8495b48cf185", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/635deca1800a68624f185dc1e04a8495b48cf185" }, { "url": "https://git.kernel.org/stable/c/f9620e2a665aa642625bd2501282bbddff556bd7", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/f9620e2a665aa642625bd2501282bbddff556bd7" }, { "url": "https://git.kernel.org/stable/c/efe9cc0f7c0279216a5522271ec675b8288602e4", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/efe9cc0f7c0279216a5522271ec675b8288602e4" }, { "url": "https://git.kernel.org/stable/c/c837f8583535f094a39386308c2ccfd92c8596cd", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/c837f8583535f094a39386308c2ccfd92c8596cd" }, { "url": "https://git.kernel.org/stable/c/aec7291003df78cb71fd461d7b672912bde55807", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/aec7291003df78cb71fd461d7b672912bde55807" } ] }, "generator": { "engine": "bippy-c9c4e1df01b2" } }