# CVE-2022-49907: linux: In the Linux kernel, the following vulnerability has been resolved:  net: mdio: fix undefined behavior in bit shift f...

CVE-2022-49907 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49907, released May 1, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-49907
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2025

## 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>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.8-1 | [DEBIAN-CVE-2022-49907](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49907.md) | May 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.8-1 | [DEBIAN-CVE-2022-49907](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49907.md) | May 1, 2025 |
| Linux | linux Debian 14 | 6.0.8-1 | [DEBIAN-CVE-2022-49907](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49907.md) | May 1, 2025 |

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