| From bippy-1.1.0 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-2022-49907: net: mdio: fix undefined behavior in bit shift for __mdiobus_register |
| |
| 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> |
| |
| The Linux kernel CVE team has assigned CVE-2022-49907 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.28 with commit 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and fixed in 4.9.333 with commit 20ed01a7b9af6e6a3c33761eebbb710ea6dd49b7 |
| Issue introduced in 2.6.28 with commit 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and fixed in 4.14.299 with commit 7006176a3c863e3e353ce1b8a349ef5bb1b9320e |
| Issue introduced in 2.6.28 with commit 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and fixed in 4.19.265 with commit a3fafc974be37319679f36dc4e7cca7db1e02973 |
| Issue introduced in 2.6.28 with commit 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and fixed in 5.4.224 with commit 4954b5359eb141499492fadfab891e28905509e2 |
| Issue introduced in 2.6.28 with commit 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and fixed in 5.10.154 with commit 634f066d02bdb22a26da7deb0c7617ab1a65fc9d |
| Issue introduced in 2.6.28 with commit 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and fixed in 5.15.78 with commit 985a88bf0b27193522bba7856b1763f428cef19d |
| Issue introduced in 2.6.28 with commit 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and fixed in 6.0.8 with commit 6ce6f8f8f6316da6f92afe7490bc2f0b654d68e0 |
| Issue introduced in 2.6.28 with commit 4fd5f812c23c7deee6425f4a318e85c317cd1d6c and fixed in 6.1 with commit 40e4eb324c59e11fcb927aa46742d28aba6ecb8a |
| |
| 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-2022-49907 |
| 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/net/phy/mdio_bus.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/20ed01a7b9af6e6a3c33761eebbb710ea6dd49b7 |
| https://git.kernel.org/stable/c/7006176a3c863e3e353ce1b8a349ef5bb1b9320e |
| https://git.kernel.org/stable/c/a3fafc974be37319679f36dc4e7cca7db1e02973 |
| https://git.kernel.org/stable/c/4954b5359eb141499492fadfab891e28905509e2 |
| https://git.kernel.org/stable/c/634f066d02bdb22a26da7deb0c7617ab1a65fc9d |
| https://git.kernel.org/stable/c/985a88bf0b27193522bba7856b1763f428cef19d |
| https://git.kernel.org/stable/c/6ce6f8f8f6316da6f92afe7490bc2f0b654d68e0 |
| https://git.kernel.org/stable/c/40e4eb324c59e11fcb927aa46742d28aba6ecb8a |
