{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-18T16:54:59.052","vulnerabilities":[{"cve":{"id":"CVE-2021-47623","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2024-07-16T12:15:02.483","lastModified":"2025-10-03T14:30:26.893","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","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 <EE,ME,IR,DR,RI>  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 <0fe00000> 9421ffe0 93e1001c 48000030\n\nImplement unmap_kernel_page() which clears an existing pte."},{"lang":"es","value":"En el kernel de Linux, se resolvió la siguiente vulnerabilidad: powerpc/fixmap: corrige la advertencia de depuración de VM al desasignar La desasignación 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 está contento cuando se le llama por segunda vez para la misma página. 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 &lt;0fe00000&gt; 9421ffe0 93e1001c 48000030 Implemente unmap_kernel_page() que borra un pte existente."}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"NVD-CWE-noinfo"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.101","matchCriteriaId":"F37E3FA0-7A8B-4AAF-9748-96E34396B25B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.24","matchCriteriaId":"866451F0-299E-416C-B0B8-AE6B33E62CCA"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"5.16.10","matchCriteriaId":"679523BA-1392-404B-AB85-F5A5408B1ECC"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*","matchCriteriaId":"7BD5F8D9-54FA-4CB0-B4F0-CB0471FDDB2D"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/033fd42c18d9b2121595b6f1e8419a115f9ac5b7","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/43ae0ccc4d2722b833fb59b905af129428e06d03","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/67baac10dd5ad1e9f50e8f2659984b3b0728d54e","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/aec982603aa8cc0a21143681feb5f60ecc69d718","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/033fd42c18d9b2121595b6f1e8419a115f9ac5b7","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/43ae0ccc4d2722b833fb59b905af129428e06d03","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/67baac10dd5ad1e9f50e8f2659984b3b0728d54e","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/aec982603aa8cc0a21143681feb5f60ecc69d718","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]}]}}]}