CVE-2021-47497 (GCVE-0-2021-47497)

Vulnerability from cvelistv5 – Published: 2024-05-22 08:19 – Updated: 2025-05-04 07:12
VLAI?
Title
nvmem: Fix shift-out-of-bound (UBSAN) with byte size cells
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmem: Fix shift-out-of-bound (UBSAN) with byte size cells If a cell has 'nbits' equal to a multiple of BITS_PER_BYTE the logic *p &= GENMASK((cell->nbits%BITS_PER_BYTE) - 1, 0); will become undefined behavior because nbits modulo BITS_PER_BYTE is 0, and we subtract one from that making a large number that is then shifted more than the number of bits that fit into an unsigned long. UBSAN reports this problem: UBSAN: shift-out-of-bounds in drivers/nvmem/core.c:1386:8 shift exponent 64 is too large for 64-bit type 'unsigned long' CPU: 6 PID: 7 Comm: kworker/u16:0 Not tainted 5.15.0-rc3+ #9 Hardware name: Google Lazor (rev3+) with KB Backlight (DT) Workqueue: events_unbound deferred_probe_work_func Call trace: dump_backtrace+0x0/0x170 show_stack+0x24/0x30 dump_stack_lvl+0x64/0x7c dump_stack+0x18/0x38 ubsan_epilogue+0x10/0x54 __ubsan_handle_shift_out_of_bounds+0x180/0x194 __nvmem_cell_read+0x1ec/0x21c nvmem_cell_read+0x58/0x94 nvmem_cell_read_variable_common+0x4c/0xb0 nvmem_cell_read_variable_le_u32+0x40/0x100 a6xx_gpu_init+0x170/0x2f4 adreno_bind+0x174/0x284 component_bind_all+0xf0/0x264 msm_drm_bind+0x1d8/0x7a0 try_to_bring_up_master+0x164/0x1ac __component_add+0xbc/0x13c component_add+0x20/0x2c dp_display_probe+0x340/0x384 platform_probe+0xc0/0x100 really_probe+0x110/0x304 __driver_probe_device+0xb8/0x120 driver_probe_device+0x4c/0xfc __device_attach_driver+0xb0/0x128 bus_for_each_drv+0x90/0xdc __device_attach+0xc8/0x174 device_initial_probe+0x20/0x2c bus_probe_device+0x40/0xa4 deferred_probe_work_func+0x7c/0xb8 process_one_work+0x128/0x21c process_scheduled_works+0x40/0x54 worker_thread+0x1ec/0x2a8 kthread+0x138/0x158 ret_from_fork+0x10/0x20 Fix it by making sure there are any bits to mask out.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 69aba7948cbe53f2f1827e84e9dd0ae470a5072e , < abcb8d33e4d2215ccde5ab5ccf9f730a59d79d97 (git)
Affected: 69aba7948cbe53f2f1827e84e9dd0ae470a5072e , < 60df06bbdf497e37ed25ad40572c362e5b0998df (git)
Affected: 69aba7948cbe53f2f1827e84e9dd0ae470a5072e , < 2df6c023050205c4d04ffc121bc549f65cb8d1df (git)
Affected: 69aba7948cbe53f2f1827e84e9dd0ae470a5072e , < eb0fc8e7170e61eaf65d28dee4a8baf4e86b19ca (git)
Affected: 69aba7948cbe53f2f1827e84e9dd0ae470a5072e , < 0594f1d048d8dc338eb9a240021b1d00ae1eb082 (git)
Affected: 69aba7948cbe53f2f1827e84e9dd0ae470a5072e , < 57e48886401b14cd351423fabfec2cfd18df4f66 (git)
Affected: 69aba7948cbe53f2f1827e84e9dd0ae470a5072e , < 0e822e5413da1af28cca350cb1cb42b6133bdcae (git)
Affected: 69aba7948cbe53f2f1827e84e9dd0ae470a5072e , < 5d388fa01fa6eb310ac023a363a6cb216d9d8fe9 (git)
Create a notification for this product.
    Linux Linux Affected: 4.3
Unaffected: 0 , < 4.3 (semver)
Unaffected: 4.4.290 , ≤ 4.4.* (semver)
Unaffected: 4.9.288 , ≤ 4.9.* (semver)
Unaffected: 4.14.252 , ≤ 4.14.* (semver)
Unaffected: 4.19.213 , ≤ 4.19.* (semver)
Unaffected: 5.4.155 , ≤ 5.4.* (semver)
Unaffected: 5.10.75 , ≤ 5.10.* (semver)
Unaffected: 5.14.14 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
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\"versions\": [{\"status\": \"affected\", \"version\": \"69aba7948cbe53f2f1827e84e9dd0ae470a5072e\", \"lessThan\": \"abcb8d33e4d2215ccde5ab5ccf9f730a59d79d97\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"69aba7948cbe53f2f1827e84e9dd0ae470a5072e\", \"lessThan\": \"60df06bbdf497e37ed25ad40572c362e5b0998df\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"69aba7948cbe53f2f1827e84e9dd0ae470a5072e\", \"lessThan\": \"2df6c023050205c4d04ffc121bc549f65cb8d1df\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"69aba7948cbe53f2f1827e84e9dd0ae470a5072e\", \"lessThan\": \"eb0fc8e7170e61eaf65d28dee4a8baf4e86b19ca\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"69aba7948cbe53f2f1827e84e9dd0ae470a5072e\", \"lessThan\": \"0594f1d048d8dc338eb9a240021b1d00ae1eb082\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"69aba7948cbe53f2f1827e84e9dd0ae470a5072e\", \"lessThan\": 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\"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.252\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.213\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.155\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.75\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/nvmem/core.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/abcb8d33e4d2215ccde5ab5ccf9f730a59d79d97\"}, {\"url\": \"https://git.kernel.org/stable/c/60df06bbdf497e37ed25ad40572c362e5b0998df\"}, {\"url\": \"https://git.kernel.org/stable/c/2df6c023050205c4d04ffc121bc549f65cb8d1df\"}, {\"url\": \"https://git.kernel.org/stable/c/eb0fc8e7170e61eaf65d28dee4a8baf4e86b19ca\"}, {\"url\": \"https://git.kernel.org/stable/c/0594f1d048d8dc338eb9a240021b1d00ae1eb082\"}, {\"url\": \"https://git.kernel.org/stable/c/57e48886401b14cd351423fabfec2cfd18df4f66\"}, {\"url\": \"https://git.kernel.org/stable/c/0e822e5413da1af28cca350cb1cb42b6133bdcae\"}, {\"url\": \"https://git.kernel.org/stable/c/5d388fa01fa6eb310ac023a363a6cb216d9d8fe9\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnvmem: Fix shift-out-of-bound (UBSAN) with byte size cells\\n\\nIf a cell has \u0027nbits\u0027 equal to a multiple of BITS_PER_BYTE the logic\\n\\n *p \u0026= GENMASK((cell-\u003enbits%BITS_PER_BYTE) - 1, 0);\\n\\nwill become undefined behavior because nbits modulo BITS_PER_BYTE is 0, and we\\nsubtract one from that making a large number that is then shifted more than the\\nnumber of bits that fit into an unsigned long.\\n\\nUBSAN reports this problem:\\n\\n UBSAN: shift-out-of-bounds in drivers/nvmem/core.c:1386:8\\n shift exponent 64 is too large for 64-bit type \u0027unsigned long\u0027\\n CPU: 6 PID: 7 Comm: kworker/u16:0 Not tainted 5.15.0-rc3+ #9\\n Hardware name: Google Lazor (rev3+) with KB Backlight (DT)\\n Workqueue: events_unbound deferred_probe_work_func\\n Call trace:\\n  dump_backtrace+0x0/0x170\\n  show_stack+0x24/0x30\\n  dump_stack_lvl+0x64/0x7c\\n  dump_stack+0x18/0x38\\n  ubsan_epilogue+0x10/0x54\\n  __ubsan_handle_shift_out_of_bounds+0x180/0x194\\n  __nvmem_cell_read+0x1ec/0x21c\\n  nvmem_cell_read+0x58/0x94\\n  nvmem_cell_read_variable_common+0x4c/0xb0\\n  nvmem_cell_read_variable_le_u32+0x40/0x100\\n  a6xx_gpu_init+0x170/0x2f4\\n  adreno_bind+0x174/0x284\\n  component_bind_all+0xf0/0x264\\n  msm_drm_bind+0x1d8/0x7a0\\n  try_to_bring_up_master+0x164/0x1ac\\n  __component_add+0xbc/0x13c\\n  component_add+0x20/0x2c\\n  dp_display_probe+0x340/0x384\\n  platform_probe+0xc0/0x100\\n  really_probe+0x110/0x304\\n  __driver_probe_device+0xb8/0x120\\n  driver_probe_device+0x4c/0xfc\\n  __device_attach_driver+0xb0/0x128\\n  bus_for_each_drv+0x90/0xdc\\n  __device_attach+0xc8/0x174\\n  device_initial_probe+0x20/0x2c\\n  bus_probe_device+0x40/0xa4\\n  deferred_probe_work_func+0x7c/0xb8\\n  process_one_work+0x128/0x21c\\n  process_scheduled_works+0x40/0x54\\n  worker_thread+0x1ec/0x2a8\\n  kthread+0x138/0x158\\n  ret_from_fork+0x10/0x20\\n\\nFix it by making sure there are any bits to mask out.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.290\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.288\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.252\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.213\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.155\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.75\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.14\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"4.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:12:19.190Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47497\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:12:19.190Z\", \"dateReserved\": \"2024-05-22T06:20:56.203Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T08:19:44.144Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.



Detection rules are retrieved from Rulezet.