| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-22085: RDMA/core: Fix use-after-free when rename device name |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| RDMA/core: Fix use-after-free when rename device name |
| |
| Syzbot reported a slab-use-after-free with the following call trace: |
| |
| ================================================================== |
| BUG: KASAN: slab-use-after-free in nla_put+0xd3/0x150 lib/nlattr.c:1099 |
| Read of size 5 at addr ffff888140ea1c60 by task syz.0.988/10025 |
| |
| CPU: 0 UID: 0 PID: 10025 Comm: syz.0.988 |
| Not tainted 6.14.0-rc4-syzkaller-00859-gf77f12010f67 #0 |
| Hardware name: Google Compute Engine, BIOS Google 02/12/2025 |
| Call Trace: |
| <TASK> |
| __dump_stack lib/dump_stack.c:94 [inline] |
| dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 |
| print_address_description mm/kasan/report.c:408 [inline] |
| print_report+0x16e/0x5b0 mm/kasan/report.c:521 |
| kasan_report+0x143/0x180 mm/kasan/report.c:634 |
| kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 |
| __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 |
| nla_put+0xd3/0x150 lib/nlattr.c:1099 |
| nla_put_string include/net/netlink.h:1621 [inline] |
| fill_nldev_handle+0x16e/0x200 drivers/infiniband/core/nldev.c:265 |
| rdma_nl_notify_event+0x561/0xef0 drivers/infiniband/core/nldev.c:2857 |
| ib_device_notify_register+0x22/0x230 drivers/infiniband/core/device.c:1344 |
| ib_register_device+0x1292/0x1460 drivers/infiniband/core/device.c:1460 |
| rxe_register_device+0x233/0x350 drivers/infiniband/sw/rxe/rxe_verbs.c:1540 |
| rxe_net_add+0x74/0xf0 drivers/infiniband/sw/rxe/rxe_net.c:550 |
| rxe_newlink+0xde/0x1a0 drivers/infiniband/sw/rxe/rxe.c:212 |
| nldev_newlink+0x5ea/0x680 drivers/infiniband/core/nldev.c:1795 |
| rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] |
| rdma_nl_rcv+0x6dd/0x9e0 drivers/infiniband/core/netlink.c:259 |
| netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] |
| netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339 |
| netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883 |
| sock_sendmsg_nosec net/socket.c:709 [inline] |
| __sock_sendmsg+0x221/0x270 net/socket.c:724 |
| ____sys_sendmsg+0x53a/0x860 net/socket.c:2564 |
| ___sys_sendmsg net/socket.c:2618 [inline] |
| __sys_sendmsg+0x269/0x350 net/socket.c:2650 |
| do_syscall_x64 arch/x86/entry/common.c:52 [inline] |
| do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 |
| entry_SYSCALL_64_after_hwframe+0x77/0x7f |
| RIP: 0033:0x7f42d1b8d169 |
| Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 ... |
| RSP: 002b:00007f42d2960038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e |
| RAX: ffffffffffffffda RBX: 00007f42d1da6320 RCX: 00007f42d1b8d169 |
| RDX: 0000000000000000 RSI: 00004000000002c0 RDI: 000000000000000c |
| RBP: 00007f42d1c0e2a0 R08: 0000000000000000 R09: 0000000000000000 |
| R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 |
| R13: 0000000000000000 R14: 00007f42d1da6320 R15: 00007ffe399344a8 |
| </TASK> |
| |
| Allocated by task 10025: |
| kasan_save_stack mm/kasan/common.c:47 [inline] |
| kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 |
| poison_kmalloc_redzone mm/kasan/common.c:377 [inline] |
| __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 |
| kasan_kmalloc include/linux/kasan.h:260 [inline] |
| __do_kmalloc_node mm/slub.c:4294 [inline] |
| __kmalloc_node_track_caller_noprof+0x28b/0x4c0 mm/slub.c:4313 |
| __kmemdup_nul mm/util.c:61 [inline] |
| kstrdup+0x42/0x100 mm/util.c:81 |
| kobject_set_name_vargs+0x61/0x120 lib/kobject.c:274 |
| dev_set_name+0xd5/0x120 drivers/base/core.c:3468 |
| assign_name drivers/infiniband/core/device.c:1202 [inline] |
| ib_register_device+0x178/0x1460 drivers/infiniband/core/device.c:1384 |
| rxe_register_device+0x233/0x350 drivers/infiniband/sw/rxe/rxe_verbs.c:1540 |
| rxe_net_add+0x74/0xf0 drivers/infiniband/sw/rxe/rxe_net.c:550 |
| rxe_newlink+0xde/0x1a0 drivers/infiniband/sw/rxe/rxe.c:212 |
| nldev_newlink+0x5ea/0x680 drivers/infiniband/core/nldev.c:1795 |
| rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] |
| rdma_nl_rcv+0x6dd/0x9e0 drivers/infiniband/core/netlink.c:259 |
| netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] |
| netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339 |
| netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883 |
| sock_sendmsg_nosec net/socket.c:709 [inline] |
| __sock_sendmsg+0x221/0x270 net/socket.c:724 |
| ____sys_sendmsg+0x53a/0x860 net/socket.c:2564 |
| ___sys_sendmsg net/socket.c:2618 [inline] |
| __sys_sendmsg+0x269/0x350 net/socket.c:2650 |
| do_syscall_x64 arch/x86/entry/common.c:52 [inline] |
| do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 |
| entry_SYSCALL_64_after_hwframe+0x77/0x7f |
| |
| Freed by task 10035: |
| kasan_save_stack mm/kasan/common.c:47 [inline] |
| kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 |
| kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576 |
| poison_slab_object mm/kasan/common.c:247 [inline] |
| __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 |
| kasan_slab_free include/linux/kasan.h:233 [inline] |
| slab_free_hook mm/slub.c:2353 [inline] |
| slab_free mm/slub.c:4609 [inline] |
| kfree+0x196/0x430 mm/slub.c:4757 |
| kobject_rename+0x38f/0x410 lib/kobject.c:524 |
| device_rename+0x16a/0x200 drivers/base/core.c:4525 |
| ib_device_rename+0x270/0x710 drivers/infiniband/core/device.c:402 |
| nldev_set_doit+0x30e/0x4c0 drivers/infiniband/core/nldev.c:1146 |
| rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] |
| rdma_nl_rcv+0x6dd/0x9e0 drivers/infiniband/core/netlink.c:259 |
| netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] |
| netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339 |
| netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883 |
| sock_sendmsg_nosec net/socket.c:709 [inline] |
| __sock_sendmsg+0x221/0x270 net/socket.c:724 |
| ____sys_sendmsg+0x53a/0x860 net/socket.c:2564 |
| ___sys_sendmsg net/socket.c:2618 [inline] |
| __sys_sendmsg+0x269/0x350 net/socket.c:2650 |
| do_syscall_x64 arch/x86/entry/common.c:52 [inline] |
| do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 |
| entry_SYSCALL_64_after_hwframe+0x77/0x7f |
| |
| This is because if rename device happens, the old name is freed in |
| ib_device_rename() with lock, but ib_device_notify_register() may visit |
| the dev name locklessly by event RDMA_REGISTER_EVENT or |
| RDMA_NETDEV_ATTACH_EVENT. |
| |
| Fix this by hold devices_rwsem in ib_device_notify_register(). |
| |
| The Linux kernel CVE team has assigned CVE-2025-22085 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.12 with commit 9cbed5aab5aeea420d0aa945733bf608449d44fb and fixed in 6.12.23 with commit 0d6460b9d2a3ee380940bdf47680751ef91cb88e |
| Issue introduced in 6.12 with commit 9cbed5aab5aeea420d0aa945733bf608449d44fb and fixed in 6.13.11 with commit 56ec8580be5174b2b9774066e60f1aad56d201db |
| Issue introduced in 6.12 with commit 9cbed5aab5aeea420d0aa945733bf608449d44fb and fixed in 6.14.2 with commit edf6b543e81ba68c6dbac2499ab362098a5a9716 |
| Issue introduced in 6.12 with commit 9cbed5aab5aeea420d0aa945733bf608449d44fb and fixed in 6.15 with commit 1d6a9e7449e2a0c1e2934eee7880ba8bd1e464cd |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2025-22085 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/infiniband/core/device.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/0d6460b9d2a3ee380940bdf47680751ef91cb88e |
| https://git.kernel.org/stable/c/56ec8580be5174b2b9774066e60f1aad56d201db |
| https://git.kernel.org/stable/c/edf6b543e81ba68c6dbac2499ab362098a5a9716 |
| https://git.kernel.org/stable/c/1d6a9e7449e2a0c1e2934eee7880ba8bd1e464cd |
