Updated: 2025-11-19 04:10:40.243561
Description:
In the Linux kernel, the following vulnerability has been resolved: net: mdio: fix undefined behavior in bit shift for __mdiobus_register Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned. The UBSAN warning calltrace like below: UBSAN: shift-out-of-bounds in drivers/net/phy/mdio_bus.c:586:27 left shift of 1 by 31 places cannot be represented in type 'int' Call Trace: <TASK> dump_stack_lvl+0x7d/0xa5 dump_stack+0x15/0x1b ubsan_epilogue+0xe/0x4e __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c __mdiobus_register+0x49d/0x4e0 fixed_mdio_bus_init+0xd8/0x12d do_one_initcall+0x76/0x430 kernel_init_freeable+0x3b3/0x422 kernel_init+0x24/0x1e0 ret_from_fork+0x1f/0x30 </TASK>
| Links | NIST | CIRCL | RHEL | Ubuntu |
| Severity | Score | |
|---|---|---|
| CVSS Version 2.x | 0.0 | |
| CVSS Version 3.x | HIGH | 7.8 |
| OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
|---|---|---|---|---|---|---|---|---|
| CentOS 6 ELS | kernel | 2.6.32 | 7.8 | HIGH | Released | CLSA-2026:1768669128 | 2026-01-28 13:06:08 | |
| CentOS 7 ELS | kernel | 3.10.0 | 7.8 | HIGH | Released | CLSA-2025:1766617167 | 2026-01-12 18:12:48 | |
| CentOS 8.4 ELS | kernel | 4.18.0 | 7.8 | HIGH | Needs Triage | 2026-01-17 01:47:02 | ||
| CentOS 8.5 ELS | kernel | 4.18.0 | 7.8 | HIGH | Needs Triage | 2026-01-17 01:47:03 | ||
| Oracle Linux 6 ELS | kernel | 2.6.32 | 7.8 | HIGH | Released | CLSA-2026:1769610819 | 2026-01-28 21:29:10 | |
| Oracle Linux 7 ELS | kernel | 3.10.0 | 7.8 | HIGH | Released | CLSA-2025:1766599987 | 2025-12-25 14:33:43 | |
| RHEL 7 ELS | kernel | 3.10.0 | 7.8 | HIGH | Released | CLSA-2025:1766600619 | 2025-12-25 14:33:25 | |
| Ubuntu 16.04 ELS | linux-hwe | 4.15.0 | 7.8 | HIGH | Already Fixed | 2025-11-28 16:27:39 | ||
| Ubuntu 16.04 ELS | linux | 4.4.0 | 7.8 | HIGH | In Testing | 2025-11-28 16:23:33 |