CVE-2022-50390 (GCVE-0-2022-50390)
Vulnerability from cvelistv5 – Published: 2025-09-18 13:33 – Updated: 2026-02-06 16:30
VLAI?
Title
drm/ttm: fix undefined behavior in bit shift for TTM_TT_FLAG_PRIV_POPULATED
Summary
In the Linux kernel, the following vulnerability has been resolved:
drm/ttm: fix undefined behavior in bit shift for TTM_TT_FLAG_PRIV_POPULATED
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 ./include/drm/ttm/ttm_tt.h:122:26
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
ttm_bo_move_memcpy+0x3b4/0x460 [ttm]
bo_driver_move+0x32/0x40 [drm_vram_helper]
ttm_bo_handle_move_mem+0x118/0x200 [ttm]
ttm_bo_validate+0xfa/0x220 [ttm]
drm_gem_vram_pin_locked+0x70/0x1b0 [drm_vram_helper]
drm_gem_vram_pin+0x48/0xb0 [drm_vram_helper]
drm_gem_vram_plane_helper_prepare_fb+0x53/0xe0 [drm_vram_helper]
drm_gem_vram_simple_display_pipe_prepare_fb+0x26/0x30 [drm_vram_helper]
drm_simple_kms_plane_prepare_fb+0x4d/0xe0 [drm_kms_helper]
drm_atomic_helper_prepare_planes+0xda/0x210 [drm_kms_helper]
drm_atomic_helper_commit+0xc3/0x1e0 [drm_kms_helper]
drm_atomic_commit+0x9c/0x160 [drm]
drm_client_modeset_commit_atomic+0x33a/0x380 [drm]
drm_client_modeset_commit_locked+0x77/0x220 [drm]
drm_client_modeset_commit+0x31/0x60 [drm]
__drm_fb_helper_restore_fbdev_mode_unlocked+0xa7/0x170 [drm_kms_helper]
drm_fb_helper_set_par+0x51/0x90 [drm_kms_helper]
fbcon_init+0x316/0x790
visual_init+0x113/0x1d0
do_bind_con_driver+0x2a3/0x5c0
do_take_over_console+0xa9/0x270
do_fbcon_takeover+0xa1/0x170
do_fb_registered+0x2a8/0x340
fbcon_fb_registered+0x47/0xe0
register_framebuffer+0x294/0x4a0
__drm_fb_helper_initial_config_and_unlock+0x43c/0x880 [drm_kms_helper]
drm_fb_helper_initial_config+0x52/0x80 [drm_kms_helper]
drm_fbdev_client_hotplug+0x156/0x1b0 [drm_kms_helper]
drm_fbdev_generic_setup+0xfc/0x290 [drm_kms_helper]
bochs_pci_probe+0x6ca/0x772 [bochs]
local_pci_probe+0x4d/0xb0
pci_device_probe+0x119/0x320
really_probe+0x181/0x550
__driver_probe_device+0xc6/0x220
driver_probe_device+0x32/0x100
__driver_attach+0x195/0x200
bus_for_each_dev+0xbb/0x120
driver_attach+0x27/0x30
bus_add_driver+0x22e/0x2f0
driver_register+0xa9/0x190
__pci_register_driver+0x90/0xa0
bochs_pci_driver_init+0x52/0x1000 [bochs]
do_one_initcall+0x76/0x430
do_init_module+0x61/0x28a
load_module+0x1f82/0x2e50
__do_sys_finit_module+0xf8/0x190
__x64_sys_finit_module+0x23/0x30
do_syscall_64+0x58/0x80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
</TASK>
Severity ?
5.5 (Medium)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
3312be8f6fc8a8dc7cef01986dbd436eab7af0f7 , < c4079a34c0adef9f35a16783fb13a9084406f96d
(git)
Affected: 3312be8f6fc8a8dc7cef01986dbd436eab7af0f7 , < 2ff0309b73d86e8591881ac035af06e01c112e89 (git) Affected: 3312be8f6fc8a8dc7cef01986dbd436eab7af0f7 , < 6528971fdce0dfc0a28fec42c151a1eccdabadf5 (git) Affected: 3312be8f6fc8a8dc7cef01986dbd436eab7af0f7 , < 387659939c00156f8d6bab0fbc55b4eaf2b6bc5b (git) |
||
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"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-50390\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-14T18:50:13.515022Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"description\": \"CWE-noinfo Not enough information\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T18:50:09.623Z\"}}], \"cna\": {\"title\": \"drm/ttm: fix undefined behavior in bit shift for TTM_TT_FLAG_PRIV_POPULATED\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3312be8f6fc8a8dc7cef01986dbd436eab7af0f7\", \"lessThan\": \"c4079a34c0adef9f35a16783fb13a9084406f96d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3312be8f6fc8a8dc7cef01986dbd436eab7af0f7\", \"lessThan\": \"2ff0309b73d86e8591881ac035af06e01c112e89\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3312be8f6fc8a8dc7cef01986dbd436eab7af0f7\", \"lessThan\": \"6528971fdce0dfc0a28fec42c151a1eccdabadf5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3312be8f6fc8a8dc7cef01986dbd436eab7af0f7\", \"lessThan\": \"387659939c00156f8d6bab0fbc55b4eaf2b6bc5b\", \"versionType\": \"git\"}], \"programFiles\": [\"include/drm/ttm/ttm_tt.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.10\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.199\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/drm/ttm/ttm_tt.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c4079a34c0adef9f35a16783fb13a9084406f96d\"}, {\"url\": \"https://git.kernel.org/stable/c/2ff0309b73d86e8591881ac035af06e01c112e89\"}, {\"url\": \"https://git.kernel.org/stable/c/6528971fdce0dfc0a28fec42c151a1eccdabadf5\"}, {\"url\": \"https://git.kernel.org/stable/c/387659939c00156f8d6bab0fbc55b4eaf2b6bc5b\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/ttm: fix undefined behavior in bit shift for TTM_TT_FLAG_PRIV_POPULATED\\n\\nShifting signed 32-bit value by 31 bits is undefined, so changing\\nsignificant bit to unsigned. The UBSAN warning calltrace like below:\\n\\nUBSAN: shift-out-of-bounds in ./include/drm/ttm/ttm_tt.h:122:26\\nleft shift of 1 by 31 places cannot be represented in type \u0027int\u0027\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0x7d/0xa5\\n dump_stack+0x15/0x1b\\n ubsan_epilogue+0xe/0x4e\\n __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c\\n ttm_bo_move_memcpy+0x3b4/0x460 [ttm]\\n bo_driver_move+0x32/0x40 [drm_vram_helper]\\n ttm_bo_handle_move_mem+0x118/0x200 [ttm]\\n ttm_bo_validate+0xfa/0x220 [ttm]\\n drm_gem_vram_pin_locked+0x70/0x1b0 [drm_vram_helper]\\n drm_gem_vram_pin+0x48/0xb0 [drm_vram_helper]\\n drm_gem_vram_plane_helper_prepare_fb+0x53/0xe0 [drm_vram_helper]\\n drm_gem_vram_simple_display_pipe_prepare_fb+0x26/0x30 [drm_vram_helper]\\n drm_simple_kms_plane_prepare_fb+0x4d/0xe0 [drm_kms_helper]\\n drm_atomic_helper_prepare_planes+0xda/0x210 [drm_kms_helper]\\n drm_atomic_helper_commit+0xc3/0x1e0 [drm_kms_helper]\\n drm_atomic_commit+0x9c/0x160 [drm]\\n drm_client_modeset_commit_atomic+0x33a/0x380 [drm]\\n drm_client_modeset_commit_locked+0x77/0x220 [drm]\\n drm_client_modeset_commit+0x31/0x60 [drm]\\n __drm_fb_helper_restore_fbdev_mode_unlocked+0xa7/0x170 [drm_kms_helper]\\n drm_fb_helper_set_par+0x51/0x90 [drm_kms_helper]\\n fbcon_init+0x316/0x790\\n visual_init+0x113/0x1d0\\n do_bind_con_driver+0x2a3/0x5c0\\n do_take_over_console+0xa9/0x270\\n do_fbcon_takeover+0xa1/0x170\\n do_fb_registered+0x2a8/0x340\\n fbcon_fb_registered+0x47/0xe0\\n register_framebuffer+0x294/0x4a0\\n __drm_fb_helper_initial_config_and_unlock+0x43c/0x880 [drm_kms_helper]\\n drm_fb_helper_initial_config+0x52/0x80 [drm_kms_helper]\\n drm_fbdev_client_hotplug+0x156/0x1b0 [drm_kms_helper]\\n drm_fbdev_generic_setup+0xfc/0x290 [drm_kms_helper]\\n bochs_pci_probe+0x6ca/0x772 [bochs]\\n local_pci_probe+0x4d/0xb0\\n pci_device_probe+0x119/0x320\\n really_probe+0x181/0x550\\n __driver_probe_device+0xc6/0x220\\n driver_probe_device+0x32/0x100\\n __driver_attach+0x195/0x200\\n bus_for_each_dev+0xbb/0x120\\n driver_attach+0x27/0x30\\n bus_add_driver+0x22e/0x2f0\\n driver_register+0xa9/0x190\\n __pci_register_driver+0x90/0xa0\\n bochs_pci_driver_init+0x52/0x1000 [bochs]\\n do_one_initcall+0x76/0x430\\n do_init_module+0x61/0x28a\\n load_module+0x1f82/0x2e50\\n __do_sys_finit_module+0xf8/0x190\\n __x64_sys_finit_module+0x23/0x30\\n do_syscall_64+0x58/0x80\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n \u003c/TASK\u003e\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.199\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.16\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.2\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2\", \"versionStartIncluding\": \"5.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-02-06T16:30:37.776Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2022-50390\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-06T16:30:37.776Z\", \"dateReserved\": \"2025-09-17T14:53:06.998Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-18T13:33:10.073Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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