| 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-2022-49098: Drivers: hv: vmbus: Fix potential crash on module unload |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| Drivers: hv: vmbus: Fix potential crash on module unload |
| |
| The vmbus driver relies on the panic notifier infrastructure to perform |
| some operations when a panic event is detected. Since vmbus can be built |
| as module, it is required that the driver handles both registering and |
| unregistering such panic notifier callback. |
| |
| After commit 74347a99e73a ("x86/Hyper-V: Unload vmbus channel in hv panic callback") |
| though, the panic notifier registration is done unconditionally in the module |
| initialization routine whereas the unregistering procedure is conditionally |
| guarded and executes only if HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE capability |
| is set. |
| |
| This patch fixes that by unconditionally unregistering the panic notifier |
| in the module's exit routine as well. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49098 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.19.118 with commit 5e059fc0f054309036d3f612bc8b0a502ca58545 and fixed in 4.19.238 with commit 6b4c0149a56147b29169e07000d566162892722a |
| Issue introduced in 5.4.35 with commit 9f38f7b46de0747c1909e8c557aa21715dce20c5 and fixed in 5.4.189 with commit 2133c422a103cf7c7768c37b9ac382e73b691892 |
| Issue introduced in 5.7 with commit 74347a99e73ae00b8385f1209aaea193c670f901 and fixed in 5.10.111 with commit cf580d2e3884dbafd6b90269b03a24d661578624 |
| Issue introduced in 5.7 with commit 74347a99e73ae00b8385f1209aaea193c670f901 and fixed in 5.15.34 with commit dcd6b1a624c0ffa21034d8b1e02e9d068458f596 |
| Issue introduced in 5.7 with commit 74347a99e73ae00b8385f1209aaea193c670f901 and fixed in 5.16.20 with commit 5ea98d0f5f035c1bcf1517ccec0e024ae35a48b2 |
| Issue introduced in 5.7 with commit 74347a99e73ae00b8385f1209aaea193c670f901 and fixed in 5.17.3 with commit 3d0078f8bddd58d9bb1ad40bbe929f8633abb276 |
| Issue introduced in 5.7 with commit 74347a99e73ae00b8385f1209aaea193c670f901 and fixed in 5.18 with commit 792f232d57ff28bbd5f9c4abe0466b23d5879dc8 |
| Issue introduced in 5.6.7 with commit caeeb3787167c884b955404a7e669fd77f267e44 |
| |
| 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-2022-49098 |
| 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/hv/vmbus_drv.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/6b4c0149a56147b29169e07000d566162892722a |
| https://git.kernel.org/stable/c/2133c422a103cf7c7768c37b9ac382e73b691892 |
| https://git.kernel.org/stable/c/cf580d2e3884dbafd6b90269b03a24d661578624 |
| https://git.kernel.org/stable/c/dcd6b1a624c0ffa21034d8b1e02e9d068458f596 |
| https://git.kernel.org/stable/c/5ea98d0f5f035c1bcf1517ccec0e024ae35a48b2 |
| https://git.kernel.org/stable/c/3d0078f8bddd58d9bb1ad40bbe929f8633abb276 |
| https://git.kernel.org/stable/c/792f232d57ff28bbd5f9c4abe0466b23d5879dc8 |
