CVE-2021-47623 (GCVE-0-2021-47623)

Vulnerability from cvelistv5 – Published: 2024-07-16 11:29 – Updated: 2026-05-11 13:58
VLAI
Title
powerpc/fixmap: Fix VM debug warning on unmap
Summary
In the Linux kernel, the following vulnerability has been resolved: powerpc/fixmap: Fix VM debug warning on unmap Unmapping a fixmap entry is done by calling __set_fixmap() with FIXMAP_PAGE_CLEAR as flags. Today, powerpc __set_fixmap() calls map_kernel_page(). map_kernel_page() is not happy when called a second time for the same page. WARNING: CPU: 0 PID: 1 at arch/powerpc/mm/pgtable.c:194 set_pte_at+0xc/0x1e8 CPU: 0 PID: 1 Comm: swapper Not tainted 5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty #682 NIP: c0017cd4 LR: c00187f0 CTR: 00000010 REGS: e1011d50 TRAP: 0700 Not tainted (5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty) MSR: 00029032 <EE,ME,IR,DR,RI> CR: 42000208 XER: 00000000 GPR00: c0165fec e1011e10 c14c0000 c0ee2550 ff800000 c0f3d000 00000000 c001686c GPR08: 00001000 b00045a9 00000001 c0f58460 c0f50000 00000000 c0007e10 00000000 GPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 GPR24: 00000000 00000000 c0ee2550 00000000 c0f57000 00000ff8 00000000 ff800000 NIP [c0017cd4] set_pte_at+0xc/0x1e8 LR [c00187f0] map_kernel_page+0x9c/0x100 Call Trace: [e1011e10] [c0736c68] vsnprintf+0x358/0x6c8 (unreliable) [e1011e30] [c0165fec] __set_fixmap+0x30/0x44 [e1011e40] [c0c13bdc] early_iounmap+0x11c/0x170 [e1011e70] [c0c06cb0] ioremap_legacy_serial_console+0x88/0xc0 [e1011e90] [c0c03634] do_one_initcall+0x80/0x178 [e1011ef0] [c0c0385c] kernel_init_freeable+0xb4/0x250 [e1011f20] [c0007e34] kernel_init+0x24/0x140 [e1011f30] [c0016268] ret_from_kernel_thread+0x5c/0x64 Instruction dump: 7fe3fb78 48019689 80010014 7c630034 83e1000c 5463d97e 7c0803a6 38210010 4e800020 81250000 712a0001 41820008 <0fe00000> 9421ffe0 93e1001c 48000030 Implement unmap_kernel_page() which clears an existing pte.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 16:59 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 265c3491c4bc8d40587996d6ee2f447a7ccfb4f3 , < 67baac10dd5ad1e9f50e8f2659984b3b0728d54e (git)
Affected: 265c3491c4bc8d40587996d6ee2f447a7ccfb4f3 , < 43ae0ccc4d2722b833fb59b905af129428e06d03 (git)
Affected: 265c3491c4bc8d40587996d6ee2f447a7ccfb4f3 , < 033fd42c18d9b2121595b6f1e8419a115f9ac5b7 (git)
Affected: 265c3491c4bc8d40587996d6ee2f447a7ccfb4f3 , < aec982603aa8cc0a21143681feb5f60ecc69d718 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.101 , ≤ 5.10.* (semver)
Unaffected: 5.15.24 , ≤ 5.15.* (semver)
Unaffected: 5.16.10 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: powerpc/fixmap: corrige la advertencia de depuraci\u00f3n de VM al desasignar La desasignaci\u00f3n de una entrada de fixmap se realiza llamando a __set_fixmap() con FIXMAP_PAGE_CLEAR como indicadores. Hoy, powerpc __set_fixmap() llama a map_kernel_page(). map_kernel_page() no est\u00e1 contento cuando se le llama por segunda vez para la misma p\u00e1gina. ADVERTENCIA: CPU: 0 PID: 1 en arch/powerpc/mm/pgtable.c:194 set_pte_at+0xc/0x1e8 CPU: 0 PID: 1 Comm: swapper No contaminado 5.16.0-rc3-s3k-dev-01993-g350ff07feb7d- sucio #682 NIP: c0017cd4 LR: c00187f0 CTR: 00000010 REGS: e1011d50 TRAP: 0700 No contaminado (5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty) MSR: 00029032  CR: 42000208 XER: 00000000 GPR00: c0165fec e1011e10 c14c0000 c0ee2550 ff800000 c0f3d000 00000000 c001686c GPR08: 00001000 b00045a9 00000001 c 0f58460 c0f50000 00000000 c0007e10 00000000 GPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 GPR24: 00000000 00000000 c0ee2550 00000000 c0f57000 00000ff8 00000000 ff800000 PIN [c0017cd4 ] set_pte_at+0xc/0x1e8 LR [c00187f0] map_kernel_page+0x9c/0x100 Seguimiento de llamadas: [e1011e10] [c0736c68] vsnprintf+0x358/0x6c8 (no confiable) [e1011e30] [c0165fec] x44 [e1011e40] [c0c13bdc] early_iounmap +0x11c/0x170 [e1011e70] [c0c06cb0] ioremap_legacy_serial_console+0x88/0xc0 [e1011e90] [c0c03634] do_one_initcall+0x80/0x178 [e1011ef0] [c0c0385c] kernel_init_freeable+0xb4 /0x250 [e1011f20] [c0007e34] kernel_init+0x24/0x140 [e1011f30 ] [c0016268] ret_from_kernel_thread+0x5c/0x64 Volcado de instrucciones: 7fe3fb78 48019689 80010014 7c630034 83e1000c 5463d97e 7c0803a6 38210010 4e800020 0 712a0001 41820008 \u0026lt;0fe00000\u0026gt; 9421ffe0 93e1001c 48000030 Implemente unmap_kernel_page() que borra un pte existente."
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        ],
        "id": "CVE-2021-47623",
        "lastModified": "2026-06-17T04:18:11.293",
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                "scope": "UNCHANGED",
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      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:fixed": "134",
      "product_status:known_affected": "199",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: powerpc/fixmap: Fix VM debug warning on unmap",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47623.json",
      "version": "3"
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    "vulnrichment": {
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              "dateUpdated": "2024-08-04T05:47:40.568Z",
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                "arch/powerpc/include/asm/book3s/64/pgtable.h",
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                  "lessThanOrEqual": "5.16.*",
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                  "status": "unaffected",
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                  "versionType": "original_commit_for_fix"
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          "cpeApplicability": [
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                    {
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/fixmap: Fix VM debug warning on unmap\n\nUnmapping a fixmap entry is done by calling __set_fixmap()\nwith FIXMAP_PAGE_CLEAR as flags.\n\nToday, powerpc __set_fixmap() calls map_kernel_page().\n\nmap_kernel_page() is not happy when called a second time\nfor the same page.\n\n\tWARNING: CPU: 0 PID: 1 at arch/powerpc/mm/pgtable.c:194 set_pte_at+0xc/0x1e8\n\tCPU: 0 PID: 1 Comm: swapper Not tainted 5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty #682\n\tNIP:  c0017cd4 LR: c00187f0 CTR: 00000010\n\tREGS: e1011d50 TRAP: 0700   Not tainted  (5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty)\n\tMSR:  00029032 \u003cEE,ME,IR,DR,RI\u003e  CR: 42000208  XER: 00000000\n\n\tGPR00: c0165fec e1011e10 c14c0000 c0ee2550 ff800000 c0f3d000 00000000 c001686c\n\tGPR08: 00001000 b00045a9 00000001 c0f58460 c0f50000 00000000 c0007e10 00000000\n\tGPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000\n\tGPR24: 00000000 00000000 c0ee2550 00000000 c0f57000 00000ff8 00000000 ff800000\n\tNIP [c0017cd4] set_pte_at+0xc/0x1e8\n\tLR [c00187f0] map_kernel_page+0x9c/0x100\n\tCall Trace:\n\t[e1011e10] [c0736c68] vsnprintf+0x358/0x6c8 (unreliable)\n\t[e1011e30] [c0165fec] __set_fixmap+0x30/0x44\n\t[e1011e40] [c0c13bdc] early_iounmap+0x11c/0x170\n\t[e1011e70] [c0c06cb0] ioremap_legacy_serial_console+0x88/0xc0\n\t[e1011e90] [c0c03634] do_one_initcall+0x80/0x178\n\t[e1011ef0] [c0c0385c] kernel_init_freeable+0xb4/0x250\n\t[e1011f20] [c0007e34] kernel_init+0x24/0x140\n\t[e1011f30] [c0016268] ret_from_kernel_thread+0x5c/0x64\n\tInstruction dump:\n\t7fe3fb78 48019689 80010014 7c630034 83e1000c 5463d97e 7c0803a6 38210010\n\t4e800020 81250000 712a0001 41820008 \u003c0fe00000\u003e 9421ffe0 93e1001c 48000030\n\nImplement unmap_kernel_page() which clears an existing pte."
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        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47623",
        "datePublished": "2024-07-16T11:29:39.071Z",
        "dateReserved": "2024-07-16T11:26:52.956Z",
        "dateUpdated": "2025-12-09T21:44:17.581Z",
        "state": "PUBLISHED"
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      "dataType": "CVE_RECORD",
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    }
  }
}



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