CVE-2022-50256
- Source
- https://cve.org/CVERecord?id=CVE-2022-50256
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-50256.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2022-50256
- Downstream
- Published
- 2025-09-15T14:02:39.052Z
- Modified
- 2026-03-09T23:50:26.013380Z
- Summary
- drm/meson: remove drm bridges at aggregate driver unbind time
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
drm/meson: remove drm bridges at aggregate driver unbind time
drm bridges added by mesonencoderhdmiinit and mesonencodercvbsinit were not manually removed at module unload time, which caused dangling references to freed memory to remain linked in the global bridge_list.
When loading the driver modules back in, the same functions would again call drmbridgeadd, and when traversing the global bridge_list, would end up peeking into freed memory.
Once again KASAN revealed the problem:
[ +0.000095] ============================================================= [ +0.000008] BUG: KASAN: use-after-free in __listaddvalid+0x9c/0x120 [ +0.000018] Read of size 8 at addr ffff00003da291f0 by task modprobe/2483
[ +0.000018] CPU: 3 PID: 2483 Comm: modprobe Tainted: G C O 5.19.0-rc6-lrmbkasan+ #1 [ +0.000011] Hardware name: Hardkernel ODROID-N2Plus (DT) [ +0.000008] Call trace: [ +0.000006] dumpbacktrace+0x1ec/0x280 [ +0.000012] showstack+0x24/0x80 [ +0.000008] dumpstacklvl+0x98/0xd4 [ +0.000011] printaddressdescription.constprop.0+0x80/0x520 [ +0.000011] printreport+0x128/0x260 [ +0.000008] kasanreport+0xb8/0xfc [ +0.000008] __asanreportload8_noabort+0x3c/0x50 [ +0.000009] __listaddvalid+0x9c/0x120 [ +0.000009] drmbridgeadd+0x6c/0x104 [drm] [ +0.000165] dwhdmiprobe+0x1900/0x2360 [dwhdmi] [ +0.000022] mesondwhdmibind+0x520/0x814 [mesondwhdmi] [ +0.000014] componentbind+0x174/0x520 [ +0.000012] componentbindall+0x1a8/0x38c [ +0.000010] mesondrvbindmaster+0x5e8/0xb74 [mesondrm] [ +0.000032] mesondrvbind+0x20/0x2c [mesondrm] [ +0.000027] trytobringupaggregatedevice+0x19c/0x390 [ +0.000010] componentmasteraddwithmatch+0x1c8/0x284 [ +0.000009] mesondrvprobe+0x274/0x280 [mesondrm] [ +0.000026] platformprobe+0xd0/0x220 [ +0.000009] reallyprobe+0x3ac/0xa80 [ +0.000009] __driverprobedevice+0x1f8/0x400 [ +0.000009] driverprobedevice+0x68/0x1b0 [ +0.000009] __driverattach+0x20c/0x480 [ +0.000008] busforeachdev+0x114/0x1b0 [ +0.000009] driverattach+0x48/0x64 [ +0.000008] busadddriver+0x390/0x564 [ +0.000009] driverregister+0x1a8/0x3e4 [ +0.000009] __platformdriverregister+0x6c/0x94 [ +0.000008] mesondrmplatformdriverinit+0x3c/0x1000 [mesondrm] [ +0.000027] dooneinitcall+0xc4/0x2b0 [ +0.000011] doinitmodule+0x154/0x570 [ +0.000011] loadmodule+0x1a78/0x1ea4 [ +0.000008] __dosysinit_module+0x184/0x1cc [ +0.000009] __arm64sysinitmodule+0x78/0xb0 [ +0.000009] invokesyscall+0x74/0x260 [ +0.000009] el0svccommon.constprop.0+0xcc/0x260 [ +0.000008] doel0svc+0x50/0x70 [ +0.000007] el0svc+0x68/0x1a0 [ +0.000012] el0t64synchandler+0x11c/0x150 [ +0.000008] el0t64sync+0x18c/0x190
[ +0.000016] Allocated by task 879: [ +0.000008] kasansavestack+0x2c/0x5c [ +0.000011] __kasan_kmalloc+0x90/0xd0 [ +0.000007] __kmalloc+0x278/0x4a0 [ +0.000011] mpiresize+0x13c/0x1d0 [ +0.000011] mpipowm+0xd24/0x1570 [ +0.000009] rsaenc+0x1a4/0x30c [ +0.000009] pkcs1padverify+0x3f0/0x580 [ +0.000009] public_keyverifysignature+0x7a8/0xba4 [ +0.000010] publickeyverifysignature2+0x40/0x60 [ +0.000008] verifysignature+0xb4/0x114 [ +0.000008] pkcs7validatetrustone.constprop.0+0x3b8/0x574 [ +0.000009] pkcs7validatetrust+0xb8/0x15c [ +0.000008] verifypkcs7messagesig+0xec/0x1b0 [ +0.000012] verifypkcs7signature+0x78/0xac [ +0.000007] modverifysig+0x110/0x190 [ +0.000009] modulesigcheck+0x114/0x1e0 [ +0.000009] loadmodule+0xa0/0x1ea4 [ +0.000008] __dosysinit_module+0x184/0x1cc [ +0.000008] _arm64sysinitmodule+0x78/0xb0 [ +0.000008] invokesyscall+0x74/0x260 [ +0.000009] el0svccommon.constprop.0+0x1a8/0x260 [ +0.000008] doel0svc+0x50/0x70 [ +0.000007] el0svc+0x68/0x1a0 [ +0.000009] el0t64synchandler+0x11c/0x150 [ +0.000009] el0t64 ---truncated---
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50256.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/09847723c12fc2753749cec3939a02ee92dac468
- https://git.kernel.org/stable/c/de2b6ebe0cb7746b5b6b35d79e150d934392b958
- https://git.kernel.org/stable/c/fc1fd114dde3d2623ac37676df3d74ffeedb0da8
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50256.json
- https://nvd.nist.gov/vuln/detail/CVE-2022-50256
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedbbbe775ec5b5dace43a35886da9924837da09dddFixedde2b6ebe0cb7746b5b6b35d79e150d934392b958Fixedfc1fd114dde3d2623ac37676df3d74ffeedb0da8Fixed09847723c12fc2753749cec3939a02ee92dac468
Affected versions
v4.*
v4.10
v4.10-rc1
v4.10-rc2
v4.10-rc3
v4.10-rc4
v4.10-rc5
v4.10-rc6
v4.10-rc7
v4.10-rc8
v4.11
v4.11-rc1
v4.11-rc2
v4.11-rc3
v4.11-rc4
v4.11-rc5
v4.11-rc6
v4.11-rc7
v4.11-rc8
v4.12
v4.12-rc1
v4.12-rc2
v4.12-rc3
v4.12-rc4
v4.12-rc5
v4.12-rc6
v4.12-rc7
v4.13
v4.13-rc1
v4.13-rc2
v4.13-rc3
v4.13-rc4
v4.13-rc5
v4.13-rc6
v4.13-rc7
v4.14
v4.14-rc1
v4.14-rc2
v4.14-rc3
v4.14-rc4
v4.14-rc5
v4.14-rc6
v4.14-rc7
v4.14-rc8
v4.15
v4.15-rc1
v4.15-rc2
v4.15-rc3
v4.15-rc4
v4.15-rc5
v4.15-rc6
v4.15-rc7
v4.15-rc8
v4.15-rc9
v4.16
v4.16-rc1
v4.16-rc2
v4.16-rc3
v4.16-rc4
v4.16-rc5
v4.16-rc6
v4.16-rc7
v4.17
v4.17-rc1
v4.17-rc2
v4.17-rc3
v4.17-rc4
v4.17-rc5
v4.17-rc6
v4.17-rc7
v4.18
v4.18-rc1
v4.18-rc2
v4.18-rc3
v4.18-rc4
v4.18-rc5
v4.18-rc6
v4.18-rc7
v4.18-rc8
v4.19
v4.19-rc1
v4.19-rc2
v4.19-rc3
v4.19-rc4
v4.19-rc5
v4.19-rc6
v4.19-rc7
v4.19-rc8
v4.20
v4.20-rc1
v4.20-rc2
v4.20-rc3
v4.20-rc4
v4.20-rc5
v4.20-rc6
v4.20-rc7
v4.9
v4.9-rc5
v4.9-rc6
v4.9-rc7
v4.9-rc8
v5.*
v5.0
v5.0-rc1
v5.0-rc2
v5.0-rc3
v5.0-rc4
v5.0-rc5
v5.0-rc6
v5.0-rc7
v5.0-rc8
v5.1
v5.1-rc1
v5.1-rc2
v5.1-rc3
v5.1-rc4
v5.1-rc5
v5.1-rc6
v5.1-rc7
v5.10
v5.10-rc1
v5.10-rc2
v5.10-rc3
v5.10-rc4
v5.10-rc5
v5.10-rc6
v5.10-rc7
v5.11
v5.11-rc1
v5.11-rc2
v5.11-rc3
v5.11-rc4
v5.11-rc5
v5.11-rc6
v5.11-rc7
v5.12
v5.12-rc1
v5.12-rc1-dontuse
v5.12-rc2
v5.12-rc3
v5.12-rc4
v5.12-rc5
v5.12-rc6
v5.12-rc7
v5.12-rc8
v5.13
v5.13-rc1
v5.13-rc2
v5.13-rc3
v5.13-rc4
v5.13-rc5
v5.13-rc6
v5.13-rc7
v5.14
v5.14-rc1
v5.14-rc2
v5.14-rc3
v5.14-rc4
v5.14-rc5
v5.14-rc6
v5.14-rc7
v5.15
v5.15-rc1
v5.15-rc2
v5.15-rc3
v5.15-rc4
v5.15-rc5
v5.15-rc6
v5.15-rc7
v5.16
v5.16-rc1
v5.16-rc2
v5.16-rc3
v5.16-rc4
v5.16-rc5
v5.16-rc6
v5.16-rc7
v5.16-rc8
v5.17
v5.17-rc1
v5.17-rc2
v5.17-rc3
v5.17-rc4
v5.17-rc5
v5.17-rc6
v5.17-rc7
v5.17-rc8
v5.18
v5.18-rc1
v5.18-rc2
v5.18-rc3
v5.18-rc4
v5.18-rc5
v5.18-rc6
v5.18-rc7
v5.19
v5.19-rc1
v5.19-rc2
v5.19-rc3
v5.19-rc4
v5.19-rc5
v5.19-rc6
v5.19-rc7
v5.19-rc8
v5.19.1
v5.19.10
v5.19.11
v5.19.12
v5.19.13
v5.19.14
v5.19.15
v5.19.16
v5.19.2
v5.19.3
v5.19.4
v5.19.5
v5.19.6
v5.19.7
v5.19.8
v5.19.9
v5.2
v5.2-rc1
v5.2-rc2
v5.2-rc3
v5.2-rc4
v5.2-rc5
v5.2-rc6
v5.2-rc7
v5.3
v5.3-rc1
v5.3-rc2
v5.3-rc3
v5.3-rc4
v5.3-rc5
v5.3-rc6
v5.3-rc7
v5.3-rc8
v5.4
v5.4-rc1
v5.4-rc2
v5.4-rc3
v5.4-rc4
v5.4-rc5
v5.4-rc6
v5.4-rc7
v5.4-rc8
v5.5
v5.5-rc1
v5.5-rc2
v5.5-rc3
v5.5-rc4
v5.5-rc5
v5.5-rc6
v5.5-rc7
v5.6
v5.6-rc1
v5.6-rc2
v5.6-rc3
v5.6-rc4
v5.6-rc5
v5.6-rc6
v5.6-rc7
v5.7
v5.7-rc1
v5.7-rc2
v5.7-rc3
v5.7-rc4
v5.7-rc5
v5.7-rc6
v5.7-rc7
v5.8
v5.8-rc1
v5.8-rc2
v5.8-rc3
v5.8-rc4
v5.8-rc5
v5.8-rc6
v5.8-rc7
v5.9
v5.9-rc1
v5.9-rc2
v5.9-rc3
v5.9-rc4
v5.9-rc5
v5.9-rc6
v5.9-rc7
v5.9-rc8
v6.*
v6.0
v6.0-rc1
v6.0-rc2
v6.0-rc3
v6.0-rc4
v6.0-rc5
v6.0-rc6
v6.0-rc7
v6.0.1
v6.0.2
Database specific
vanir_signatures
[
{
"target": {
"file": "drivers/gpu/drm/meson/meson_encoder_hdmi.c"
},
"digest": {
"line_hashes": [
"78145924459607610191276802985234035138",
"202935943407831398078143812432601545310",
"216741922325335876318667657977293863957",
"311096235982829373451826257055818666485"
],
"threshold": 0.9
},
"signature_type": "Line",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-164fc8df",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@fc1fd114dde3d2623ac37676df3d74ffeedb0da8"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_encoder_hdmi.c"
},
"digest": {
"line_hashes": [
"78145924459607610191276802985234035138",
"202935943407831398078143812432601545310",
"216741922325335876318667657977293863957",
"311096235982829373451826257055818666485"
],
"threshold": 0.9
},
"signature_type": "Line",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-166b34d1",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@09847723c12fc2753749cec3939a02ee92dac468"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_encoder_hdmi.h"
},
"digest": {
"line_hashes": [
"54395894934096935120604430043444296778"
],
"threshold": 0.9
},
"signature_type": "Line",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-1c59ff23",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@fc1fd114dde3d2623ac37676df3d74ffeedb0da8"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_drv.c"
},
"digest": {
"line_hashes": [
"275846606163324379078093165132595043109",
"69236816549826289074857001984012720522",
"234137996624987484461017627838128503956",
"277729470936738704670910155524044084555"
],
"threshold": 0.9
},
"signature_type": "Line",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-23f0fed1",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@fc1fd114dde3d2623ac37676df3d74ffeedb0da8"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_drv.h"
},
"digest": {
"line_hashes": [
"138350390366988112130301474808204660692",
"284136296635744620512884107658800917051",
"155874156112914408875081353553742782782",
"187785222826407028420271493836431171325",
"161012383298182212279118153968414320733",
"181253651230448154654298182358801308658",
"109197538791969111736288268438756749043"
],
"threshold": 0.9
},
"signature_type": "Line",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-2f352c99",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@fc1fd114dde3d2623ac37676df3d74ffeedb0da8"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_drv.c",
"function": "meson_drv_unbind"
},
"digest": {
"length": 549.0,
"function_hash": "279042894729103604515413555599082916343"
},
"signature_type": "Function",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-3158befc",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@fc1fd114dde3d2623ac37676df3d74ffeedb0da8"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_drv.c",
"function": "meson_drv_unbind"
},
"digest": {
"length": 549.0,
"function_hash": "279042894729103604515413555599082916343"
},
"signature_type": "Function",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-53248318",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@de2b6ebe0cb7746b5b6b35d79e150d934392b958"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_encoder_hdmi.h"
},
"digest": {
"line_hashes": [
"54395894934096935120604430043444296778"
],
"threshold": 0.9
},
"signature_type": "Line",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-54fa29c4",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@09847723c12fc2753749cec3939a02ee92dac468"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_encoder_cvbs.h"
},
"digest": {
"line_hashes": [
"51063589674203128772868127797188189084",
"223461176773085536776376525932697298046"
],
"threshold": 0.9
},
"signature_type": "Line",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-55319dda",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@de2b6ebe0cb7746b5b6b35d79e150d934392b958"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_drv.h"
},
"digest": {
"line_hashes": [
"138350390366988112130301474808204660692",
"284136296635744620512884107658800917051",
"155874156112914408875081353553742782782",
"187785222826407028420271493836431171325",
"161012383298182212279118153968414320733",
"181253651230448154654298182358801308658",
"109197538791969111736288268438756749043"
],
"threshold": 0.9
},
"signature_type": "Line",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-6e6e0e41",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@09847723c12fc2753749cec3939a02ee92dac468"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_encoder_hdmi.c",
"function": "meson_encoder_hdmi_init"
},
"digest": {
"length": 2173.0,
"function_hash": "104196635844056457239928771987749447642"
},
"signature_type": "Function",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-79c951e7",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@fc1fd114dde3d2623ac37676df3d74ffeedb0da8"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_encoder_hdmi.h"
},
"digest": {
"line_hashes": [
"54395894934096935120604430043444296778"
],
"threshold": 0.9
},
"signature_type": "Line",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-823e6ebc",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@de2b6ebe0cb7746b5b6b35d79e150d934392b958"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_encoder_cvbs.c"
},
"digest": {
"line_hashes": [
"78370321060721061012287153695025216135",
"153364925281979551694381570463265193254"
],
"threshold": 0.9
},
"signature_type": "Line",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-8374d064",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@fc1fd114dde3d2623ac37676df3d74ffeedb0da8"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_drv.c",
"function": "meson_drv_unbind"
},
"digest": {
"length": 549.0,
"function_hash": "279042894729103604515413555599082916343"
},
"signature_type": "Function",
"signature_version": "v1",
"deprecated": false,
"id": "CVE-2022-50256-885e8dc1",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@09847723c12fc2753749cec3939a02ee92dac468"
},
{
"target": {
"file": "drivers/gpu/drm/meson/meson_drv.c"
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source
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