{ "schema_version": "1.6.1", "id": "RPI-CVE-2025-21875", "modified": "2026-10-07T17:22:01Z", "upstream": [ "CVE-2025-21875" ], "published": "2025-03-27T15:01:31Z", "summary": "mptcp: always handle address removal under msk socket lock", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: always handle address removal under msk socket lock\n\nSyzkaller reported a lockdep splat in the PM control path:\n\n WARNING: CPU: 0 PID: 6693 at ./include/net/sock.h:1711 sock_owned_by_me include/net/sock.h:1711 [inline]\n WARNING: CPU: 0 PID: 6693 at ./include/net/sock.h:1711 msk_owned_by_me net/mptcp/protocol.h:363 [inline]\n WARNING: CPU: 0 PID: 6693 at ./include/net/sock.h:1711 mptcp_pm_nl_addr_send_ack+0x57c/0x610 net/mptcp/pm_netlink.c:788\n Modules linked in:\n CPU: 0 UID: 0 PID: 6693 Comm: syz.0.205 Not tainted 6.14.0-rc2-syzkaller-00303-gad1b832bf1cf #0\n Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024\n RIP: 0010:sock_owned_by_me include/net/sock.h:1711 [inline]\n RIP: 0010:msk_owned_by_me net/mptcp/protocol.h:363 [inline]\n RIP: 0010:mptcp_pm_nl_addr_send_ack+0x57c/0x610 net/mptcp/pm_netlink.c:788\n Code: 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 ca 7b d3 f5 eb b9 e8 c3 7b d3 f5 90 0f 0b 90 e9 dd fb ff ff e8 b5 7b d3 f5 90 <0f> 0b 90 e9 3e fb ff ff 44 89 f1 80 e1 07 38 c1 0f 8c eb fb ff ff\n RSP: 0000:ffffc900034f6f60 EFLAGS: 00010283\n RAX: ffffffff8bee3c2b RBX: 0000000000000001 RCX: 0000000000080000\n RDX: ffffc90004d42000 RSI: 000000000000a407 RDI: 000000000000a408\n RBP: ffffc900034f7030 R08: ffffffff8bee37f6 R09: 0100000000000000\n R10: dffffc0000000000 R11: ffffed100bcc62e4 R12: ffff88805e6316e0\n R13: ffff88805e630c00 R14: dffffc0000000000 R15: ffff88805e630c00\n FS: 00007f7e9a7e96c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000001b2fd18ff8 CR3: 0000000032c24000 CR4: 00000000003526f0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n \n mptcp_pm_remove_addr+0x103/0x1d0 net/mptcp/pm.c:59\n mptcp_pm_remove_anno_addr+0x1f4/0x2f0 net/mptcp/pm_netlink.c:1486\n mptcp_nl_remove_subflow_and_signal_addr net/mptcp/pm_netlink.c:1518 [inline]\n mptcp_pm_nl_del_addr_doit+0x118d/0x1af0 net/mptcp/pm_netlink.c:1629\n genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]\n genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]\n genl_rcv_msg+0xb1f/0xec0 net/netlink/genetlink.c:1210\n netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2543\n genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219\n netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]\n netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1348\n netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1892\n sock_sendmsg_nosec net/socket.c:718 [inline]\n __sock_sendmsg+0x221/0x270 net/socket.c:733\n ____sys_sendmsg+0x53a/0x860 net/socket.c:2573\n ___sys_sendmsg net/socket.c:2627 [inline]\n __sys_sendmsg+0x269/0x350 net/socket.c:2659\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n RIP: 0033:0x7f7e9998cde9\n Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48\n RSP: 002b:00007f7e9a7e9038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\n RAX: ffffffffffffffda RBX: 00007f7e99ba5fa0 RCX: 00007f7e9998cde9\n RDX: 000000002000c094 RSI: 0000400000000000 RDI: 0000000000000007\n RBP: 00007f7e99a0e2a0 R08: 0000000000000000 R09: 0000000000000000\n R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\n R13: 0000000000000000 R14: 00007f7e99ba5fa0 R15: 00007fff49231088\n\nIndeed the PM can try to send a RM_ADDR over a msk without acquiring\nfirst the msk socket lock.\n\nThe bugged code-path comes from an early optimization: when there\nare no subflows, the PM should (usually) not send RM_ADDR\nnotifications.\n\nThe above statement is incorrect, as without locks another process\ncould concur\n---truncated---", "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1", "1:6.6.47-1+rpt1", "1:6.6.51-1+rpt1", "1:6.6.51-1+rpt2", "1:6.6.51-1+rpt3", "1:6.6.62-1+rpt1", "1:6.6.74-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi2-rpi-v8", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-2712", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v6", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v7", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v8", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi4-rpi-2712", "binary_version": "1:6.1.54-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi4-rpi-v8", "binary_version": "1:6.1.54-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi6-rpi-2712", "binary_version": "1:6.1.58-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi6-rpi-v8", "binary_version": "1:6.1.58-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi7-rpi-2712", "binary_version": "1:6.1.63-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi7-rpi-v8", "binary_version": "1:6.1.63-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi8-rpi-2712", "binary_version": "1:6.1.73-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi8-rpi-v8", "binary_version": "1:6.1.73-1+rpt1" }, { "binary_name": "linux-image-6.6.20+rpt-rpi-2712", "binary_version": "1:6.6.20-1+rpt1" }, { "binary_name": "linux-image-6.6.20+rpt-rpi-v8", "binary_version": "1:6.6.20-1+rpt1" }, { "binary_name": "linux-image-6.6.28+rpt-rpi-2712", "binary_version": "1:6.6.28-1+rpt1" }, { "binary_name": "linux-image-6.6.28+rpt-rpi-v8", "binary_version": "1:6.6.28-1+rpt1" }, { "binary_name": "linux-image-6.6.31+rpt-rpi-2712", "binary_version": "1:6.6.31-1+rpt1" }, { "binary_name": "linux-image-6.6.31+rpt-rpi-v8", "binary_version": "1:6.6.31-1+rpt1" }, { "binary_name": "linux-image-6.6.47+rpt-rpi-2712", "binary_version": "1:6.6.47-1+rpt1" }, { "binary_name": "linux-image-6.6.47+rpt-rpi-v8", "binary_version": "1:6.6.47-1+rpt1" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-2712", "binary_version": "1:6.6.51-1+rpt1" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v8", "binary_version": "1:6.6.51-1+rpt1" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-2712", "binary_version": "1:6.6.51-1+rpt2" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v8", "binary_version": "1:6.6.51-1+rpt2" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-2712", "binary_version": "1:6.6.51-1+rpt3" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v8", "binary_version": "1:6.6.51-1+rpt3" }, { "binary_name": "linux-image-6.6.62+rpt-rpi-2712", "binary_version": "1:6.6.62-1+rpt1" }, { "binary_name": "linux-image-6.6.62+rpt-rpi-v8", "binary_version": "1:6.6.62-1+rpt1" }, { "binary_name": "linux-image-6.6.74+rpt-rpi-2712", "binary_version": "1:6.6.74-1+rpt1" }, { "binary_name": "linux-image-6.6.74+rpt-rpi-v8", "binary_version": "1:6.6.74-1+rpt1" } ] }, "database_specific": { "per_version": { "1:6.1.47-1+rpt2": { "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e", "upstream_version": "6.1.47", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.130" }, "1:6.1.47-1+rpt4": { "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e", "upstream_version": "6.1.47", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.130", "compiled_filter": false }, "1:6.1.54-1+rpt2": { "linux_commit": "2906f7abdc03d4a92b6b0e2e0c87ea2a9dffe8f7", "upstream_version": "6.1.54", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.130" }, "1:6.1.58-1+rpt2": { "linux_commit": "ccf1586ad0663fa91238ac56abf6340d6d740d18", "upstream_version": "6.1.58", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.130" }, "1:6.1.63-1+rpt1": { "linux_commit": null, "upstream_version": "6.1.63", "assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.130" }, "1:6.1.73-1+rpt1": { "linux_commit": null, "upstream_version": "6.1.73", "assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.130" }, "1:6.6.20-1+rpt1": { "linux_commit": "6f16847710cc0502450788b9f12f0a14d3429668", "upstream_version": "6.6.20", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.81" }, "1:6.6.28-1+rpt1": { "linux_commit": "0c341f47adc3578cd5f817aa20ee2b7f9ae6b23e", "upstream_version": "6.6.28", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.81" }, "1:6.6.31-1+rpt1": { "linux_commit": "c1432b4bae5b6582f4d32ba381459f33c34d1424", "upstream_version": "6.6.31", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.81" }, "1:6.6.47-1+rpt1": { "linux_commit": "cf64a1dfecc2dc418efdd61701c1a4b185ab4761", "upstream_version": "6.6.47", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.81" }, "1:6.6.51-1+rpt1": { "linux_commit": "0094eba3f2a4338cfa6854b0b5104d02ba0fa01f", "upstream_version": "6.6.51", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.81" }, "1:6.6.51-1+rpt2": { "linux_commit": "82a50e430ef1d6eb37d78e25aa572c1f6ea56160", "upstream_version": "6.6.51", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.81" }, "1:6.6.51-1+rpt3": { "linux_commit": "5aeecea9f4a45248bcf564dec924965e066a7bfd", "upstream_version": "6.6.51", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.81" }, "1:6.6.62-1+rpt1": { "linux_commit": "dd2394360860d15146c96635796a75b05bb32b61", "upstream_version": "6.6.62", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.81" }, "1:6.6.74-1+rpt1": { "linux_commit": "a18d9ced4965462cb7b3b4252ada440395105308", "upstream_version": "6.6.74", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.81" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2025-21875" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/494ec285535632732eaa5786297a9ae4f731b5ff" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/7cca31035c05819643ffb5d7518e9a331b3f6651" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/8116fb4acd5d3f06cd37f84887dbe962b6703b1c" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/a05da2be18aae7e82572f8d795f41bb49f5dfc7d" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/4124b782ec2b1e2e490cf0bbf10f53dfd3479890" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/2c3de6dff4373f1036e003f49a32629359530bdb" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/f865c24bc55158313d5779fc81116023a6940ca3" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T12:19:11Z" } }