CVE-2022-50378: drm/meson: reorder driver deinit sequence to fix use-after-free bug
In the Linux kernel, the following vulnerability has been resolved:
drm/meson: reorder driver deinit sequence to fix use-after-free bug
Unloading the driver triggers the following KASAN warning:
[ +0.006275] ============================================================= [ +0.000029] BUG: KASAN: use-after-free in listdelentryvalid+0xe0/0x1a0 [ +0.000026] Read of size 8 at addr ffff000020c395e0 by task rmmod/2695
[ +0.000019] CPU: 5 PID: 2695 Comm: rmmod Tainted: G C O 5.19.0-rc6-lrmbkasan+ #1 [ +0.000013] Hardware name: Hardkernel ODROID-N2Plus (DT) [ +0.000008] Call trace: [ +0.000007] dumpbacktrace+0x1ec/0x280 [ +0.000013] showstack+0x24/0x80 [ +0.000008] dumpstacklvl+0x98/0xd4 [ +0.000011] printaddressdescription.constprop.0+0x80/0x520 [ +0.000011] printreport+0x128/0x260 [ +0.000007] kasanreport+0xb8/0xfc [ +0.000008] asanreportload8noabort+0x3c/0x50 [ +0.000010] listdelentryvalid+0xe0/0x1a0 [ +0.000009] drmatomicprivateobjfini+0x30/0x200 [drm] [ +0.000172] drmbridgedetach+0x94/0x260 [drm] [ +0.000145] drmencodercleanup+0xa4/0x290 [drm] [ +0.000144] drmmodeconfigcleanup+0x118/0x740 [drm] [ +0.000143] drmmodeconfiginitrelease+0x1c/0x2c [drm] [ +0.000144] drmmanagedrelease+0x170/0x414 [drm] [ +0.000142] drmdevput.part.0+0xc0/0x124 [drm] [ +0.000143] drmdevput+0x20/0x30 [drm] [ +0.000142] mesondrvunbind+0x1d8/0x2ac [mesondrm] [ +0.000028] takedownaggregatedevice+0xb0/0x160 [ +0.000016] componentdel+0x18c/0x360 [ +0.000009] mesondwhdmiremove+0x28/0x40 [mesondwhdmi] [ +0.000015] platformremove+0x64/0xb0 [ +0.000009] deviceremove+0xb8/0x154 [ +0.000009] devicereleasedriverinternal+0x398/0x5b0 [ +0.000009] driverdetach+0xac/0x1b0 [ +0.000009] busremovedriver+0x158/0x29c [ +0.000009] driverunregister+0x70/0xb0 [ +0.000008] platformdriverunregister+0x20/0x2c [ +0.000008] mesondwhdmiplatformdriverexit+0x1c/0x30 [mesondwhdmi] [ +0.000012] dosysdeletemodule+0x288/0x400 [ +0.000011] arm64sysdeletemodule+0x5c/0x80 [ +0.000009] invokesyscall+0x74/0x260 [ +0.000009] el0svccommon.constprop.0+0xcc/0x260 [ +0.000009] doel0svc+0x50/0x70 [ +0.000007] el0svc+0x68/0x1a0 [ +0.000012] el0t64synchandler+0x11c/0x150 [ +0.000008] el0t64sync+0x18c/0x190
[ +0.000018] Allocated by task 0: [ +0.000007] (stack is not available)
[ +0.000011] Freed by task 2695: [ +0.000008] kasansavestack+0x2c/0x5c [ +0.000011] kasansettrack+0x2c/0x40 [ +0.000008] kasansetfreeinfo+0x28/0x50 [ +0.000009] kasanslabfree+0x128/0x1d4 [ +0.000008] kasanslabfree+0x18/0x24 [ +0.000007] slabfreefreelisthook+0x108/0x230 [ +0.000011] kfree+0x110/0x35c [ +0.000008] releasenodes+0xf0/0x16c [ +0.000009] devresreleasegroup+0x180/0x270 [ +0.000008] componentunbind+0x128/0x1e0 [ +0.000010] componentunbindall+0x1b8/0x264 [ +0.000009] mesondrvunbind+0x1a0/0x2ac [mesondrm] [ +0.000025] takedownaggregatedevice+0xb0/0x160 [ +0.000009] componentdel+0x18c/0x360 [ +0.000009] mesondwhdmiremove+0x28/0x40 [mesondwhdmi] [ +0.000012] platformremove+0x64/0xb0 [ +0.000008] deviceremove+0xb8/0x154 [ +0.000009] devicereleasedriverinternal+0x398/0x5b0 [ +0.000009] driverdetach+0xac/0x1b0 [ +0.000009] busremovedriver+0x158/0x29c [ +0.000008] driverunregister+0x70/0xb0 [ +0.000008] platformdriverunregister+0x20/0x2c [ +0.000008] mesondwhdmiplatformdriverexit+0x1c/0x30 [mesondwhdmi] [ +0.000011] dosysdeletemodule+0x288/0x400 [ +0.000010] arm64sysdeletemodule+0x5c/0x80 [ +0.000008] invokesyscall+0x74/0x260 [ +0.000008] el0svccommon.constprop.0+0xcc/0x260 [ +0.000008] doel0svc+0x50/0x70 [ +0.000007] el0svc+0x68/0x1a0 [ +0.000009] el0t64synchandler+0x11c/0x150 [ +0.000009] el0t64sync+0x18c/0x190
[ +0.000014] The buggy address belongs to the object at ffff000020c39000 ---truncated---
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2022-50378?
CVE-2022-50378 has been classified as a moderate severity vulnerability in the Linux kernel.
How do I fix CVE-2022-50378?
To resolve CVE-2022-50378, users should upgrade their Linux kernel to the latest patched version.
Which versions of the Linux kernel are affected by CVE-2022-50378?
CVE-2022-50378 affects Linux kernel versions starting from 5.19.0-rc6.
What type of vulnerability is CVE-2022-50378?
CVE-2022-50378 is a use-after-free vulnerability related to the drm/meson driver.
What impact does CVE-2022-50378 have on system security?
CVE-2022-50378 could potentially allow an attacker to exploit the use-after-free condition, leading to system instability or unauthorized access.