| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-21725: smb: client: fix oops due to unset link speed |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| smb: client: fix oops due to unset link speed |
| |
| It isn't guaranteed that NETWORK_INTERFACE_INFO::LinkSpeed will always |
| be set by the server, so the client must handle any values and then |
| prevent oopses like below from happening: |
| |
| Oops: divide error: 0000 [#1] PREEMPT SMP KASAN NOPTI |
| CPU: 0 UID: 0 PID: 1323 Comm: cat Not tainted 6.13.0-rc7 #2 |
| Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-3.fc41 |
| 04/01/2014 |
| RIP: 0010:cifs_debug_data_proc_show+0xa45/0x1460 [cifs] Code: 00 00 48 |
| 89 df e8 3b cd 1b c1 41 f6 44 24 2c 04 0f 84 50 01 00 00 48 89 ef e8 |
| e7 d0 1b c1 49 8b 44 24 18 31 d2 49 8d 7c 24 28 <48> f7 74 24 18 48 89 |
| c3 e8 6e cf 1b c1 41 8b 6c 24 28 49 8d 7c 24 |
| RSP: 0018:ffffc90001817be0 EFLAGS: 00010246 |
| RAX: 0000000000000000 RBX: ffff88811230022c RCX: ffffffffc041bd99 |
| RDX: 0000000000000000 RSI: 0000000000000567 RDI: ffff888112300228 |
| RBP: ffff888112300218 R08: fffff52000302f5f R09: ffffed1022fa58ac |
| R10: ffff888117d2c566 R11: 00000000fffffffe R12: ffff888112300200 |
| R13: 000000012a15343f R14: 0000000000000001 R15: ffff888113f2db58 |
| FS: 00007fe27119e740(0000) GS:ffff888148600000(0000) |
| knlGS:0000000000000000 |
| CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 |
| CR2: 00007fe2633c5000 CR3: 0000000124da0000 CR4: 0000000000750ef0 |
| PKRU: 55555554 |
| Call Trace: |
| <TASK> |
| ? __die_body.cold+0x19/0x27 |
| ? die+0x2e/0x50 |
| ? do_trap+0x159/0x1b0 |
| ? cifs_debug_data_proc_show+0xa45/0x1460 [cifs] |
| ? do_error_trap+0x90/0x130 |
| ? cifs_debug_data_proc_show+0xa45/0x1460 [cifs] |
| ? exc_divide_error+0x39/0x50 |
| ? cifs_debug_data_proc_show+0xa45/0x1460 [cifs] |
| ? asm_exc_divide_error+0x1a/0x20 |
| ? cifs_debug_data_proc_show+0xa39/0x1460 [cifs] |
| ? cifs_debug_data_proc_show+0xa45/0x1460 [cifs] |
| ? seq_read_iter+0x42e/0x790 |
| seq_read_iter+0x19a/0x790 |
| proc_reg_read_iter+0xbe/0x110 |
| ? __pfx_proc_reg_read_iter+0x10/0x10 |
| vfs_read+0x469/0x570 |
| ? do_user_addr_fault+0x398/0x760 |
| ? __pfx_vfs_read+0x10/0x10 |
| ? find_held_lock+0x8a/0xa0 |
| ? __pfx_lock_release+0x10/0x10 |
| ksys_read+0xd3/0x170 |
| ? __pfx_ksys_read+0x10/0x10 |
| ? __rcu_read_unlock+0x50/0x270 |
| ? mark_held_locks+0x1a/0x90 |
| do_syscall_64+0xbb/0x1d0 |
| entry_SYSCALL_64_after_hwframe+0x77/0x7f |
| RIP: 0033:0x7fe271288911 |
| Code: 00 48 8b 15 01 25 10 00 f7 d8 64 89 02 b8 ff ff ff ff eb bd e8 |
| 20 ad 01 00 f3 0f 1e fa 80 3d b5 a7 10 00 00 74 13 31 c0 0f 05 <48> 3d |
| 00 f0 ff ff 77 4f c3 66 0f 1f 44 00 00 55 48 89 e5 48 83 ec |
| RSP: 002b:00007ffe87c079d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 |
| RAX: ffffffffffffffda RBX: 0000000000040000 RCX: 00007fe271288911 |
| RDX: 0000000000040000 RSI: 00007fe2633c6000 RDI: 0000000000000003 |
| RBP: 00007ffe87c07a00 R08: 0000000000000000 R09: 00007fe2713e6380 |
| R10: 0000000000000022 R11: 0000000000000246 R12: 0000000000040000 |
| R13: 00007fe2633c6000 R14: 0000000000000003 R15: 0000000000000000 |
| </TASK> |
| |
| Fix this by setting cifs_server_iface::speed to a sane value (1Gbps) |
| by default when link speed is unset. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21725 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.1.65 with commit 548893404c44fc01a59f17727876e02553146fe6 and fixed in 6.1.129 with commit 208e102a2fca44e40a6c3f7b9e2609cfd17a15aa |
| Issue introduced in 6.6.4 with commit 1cd8c353708de99d8bfa7db8a0c961a800b1fa7f and fixed in 6.6.76 with commit 3f901c35e1a1b3ed1b528a17ffdb941aa0294458 |
| Issue introduced in 6.7 with commit a6d8fb54a515f0546ffdb7870102b1238917e567 and fixed in 6.12.13 with commit 699179dfc8d7da457b152ca5d18ae45f9ed9beaa |
| Issue introduced in 6.7 with commit a6d8fb54a515f0546ffdb7870102b1238917e567 and fixed in 6.13.2 with commit ad3b49fbdb156aa8ee2026ba590642c9b5a410f2 |
| Issue introduced in 6.7 with commit a6d8fb54a515f0546ffdb7870102b1238917e567 and fixed in 6.14 with commit be7a6a77669588bfa5022a470989702bbbb11e7f |
| |
| 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-2025-21725 |
| 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: |
| fs/smb/client/smb2ops.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/208e102a2fca44e40a6c3f7b9e2609cfd17a15aa |
| https://git.kernel.org/stable/c/3f901c35e1a1b3ed1b528a17ffdb941aa0294458 |
| https://git.kernel.org/stable/c/699179dfc8d7da457b152ca5d18ae45f9ed9beaa |
| https://git.kernel.org/stable/c/ad3b49fbdb156aa8ee2026ba590642c9b5a410f2 |
| https://git.kernel.org/stable/c/be7a6a77669588bfa5022a470989702bbbb11e7f |
