| 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-2021-47073: platform/x86: dell-smbios-wmi: Fix oops on rmmod dell_smbios |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| platform/x86: dell-smbios-wmi: Fix oops on rmmod dell_smbios |
| |
| init_dell_smbios_wmi() only registers the dell_smbios_wmi_driver on systems |
| where the Dell WMI interface is supported. While exit_dell_smbios_wmi() |
| unregisters it unconditionally, this leads to the following oops: |
| |
| [ 175.722921] ------------[ cut here ]------------ |
| [ 175.722925] Unexpected driver unregister! |
| [ 175.722939] WARNING: CPU: 1 PID: 3630 at drivers/base/driver.c:194 driver_unregister+0x38/0x40 |
| ... |
| [ 175.723089] Call Trace: |
| [ 175.723094] cleanup_module+0x5/0xedd [dell_smbios] |
| ... |
| [ 175.723148] ---[ end trace 064c34e1ad49509d ]--- |
| |
| Make the unregister happen on the same condition the register happens |
| to fix this. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47073 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.15 with commit 1a258e670434f404a4500b65ba1afea2c2b29bba and fixed in 4.19.192 with commit 75cfc833da4a2111106d4c134e93e0c7f41e35e7 |
| Issue introduced in 4.15 with commit 1a258e670434f404a4500b65ba1afea2c2b29bba and fixed in 5.4.122 with commit 6fa78a6b9a3beb676a010dc489c1257f7e432525 |
| Issue introduced in 4.15 with commit 1a258e670434f404a4500b65ba1afea2c2b29bba and fixed in 5.10.40 with commit 0cf036a0d325200e6c27b90908e51195bbc557b1 |
| Issue introduced in 4.15 with commit 1a258e670434f404a4500b65ba1afea2c2b29bba and fixed in 5.12.7 with commit 8d746ea7c687bab060a2c05a35c449302406cd52 |
| Issue introduced in 4.15 with commit 1a258e670434f404a4500b65ba1afea2c2b29bba and fixed in 5.13 with commit 3a53587423d25c87af4b4126a806a0575104b45e |
| |
| 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-2021-47073 |
| 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/platform/x86/dell/dell-smbios-wmi.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/75cfc833da4a2111106d4c134e93e0c7f41e35e7 |
| https://git.kernel.org/stable/c/6fa78a6b9a3beb676a010dc489c1257f7e432525 |
| https://git.kernel.org/stable/c/0cf036a0d325200e6c27b90908e51195bbc557b1 |
| https://git.kernel.org/stable/c/8d746ea7c687bab060a2c05a35c449302406cd52 |
| https://git.kernel.org/stable/c/3a53587423d25c87af4b4126a806a0575104b45e |
