{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47623","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-07-16T11:26:52.956Z","datePublished":"2024-07-16T11:29:39.071Z","dateUpdated":"2025-12-18T11:38:16.893Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-12-18T11:38:16.893Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/powerpc/include/asm/book3s/32/pgtable.h","arch/powerpc/include/asm/book3s/64/pgtable.h","arch/powerpc/include/asm/fixmap.h","arch/powerpc/include/asm/nohash/32/pgtable.h","arch/powerpc/include/asm/nohash/64/pgtable.h","arch/powerpc/mm/pgtable.c"],"versions":[{"version":"265c3491c4bc8d40587996d6ee2f447a7ccfb4f3","lessThan":"67baac10dd5ad1e9f50e8f2659984b3b0728d54e","status":"affected","versionType":"git"},{"version":"265c3491c4bc8d40587996d6ee2f447a7ccfb4f3","lessThan":"43ae0ccc4d2722b833fb59b905af129428e06d03","status":"affected","versionType":"git"},{"version":"265c3491c4bc8d40587996d6ee2f447a7ccfb4f3","lessThan":"033fd42c18d9b2121595b6f1e8419a115f9ac5b7","status":"affected","versionType":"git"},{"version":"265c3491c4bc8d40587996d6ee2f447a7ccfb4f3","lessThan":"aec982603aa8cc0a21143681feb5f60ecc69d718","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/powerpc/include/asm/book3s/32/pgtable.h","arch/powerpc/include/asm/book3s/64/pgtable.h","arch/powerpc/include/asm/fixmap.h","arch/powerpc/include/asm/nohash/32/pgtable.h","arch/powerpc/include/asm/nohash/64/pgtable.h","arch/powerpc/mm/pgtable.c"],"versions":[{"version":"5.5","status":"affected"},{"version":"0","lessThan":"5.5","status":"unaffected","versionType":"semver"},{"version":"5.10.101","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.24","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"5.16.10","lessThanOrEqual":"5.16.*","status":"unaffected","versionType":"semver"},{"version":"5.17","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.15.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.16.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.17"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/67baac10dd5ad1e9f50e8f2659984b3b0728d54e"},{"url":"https://git.kernel.org/stable/c/43ae0ccc4d2722b833fb59b905af129428e06d03"},{"url":"https://git.kernel.org/stable/c/033fd42c18d9b2121595b6f1e8419a115f9ac5b7"},{"url":"https://git.kernel.org/stable/c/aec982603aa8cc0a21143681feb5f60ecc69d718"}],"title":"powerpc/fixmap: Fix VM debug warning on unmap","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:47:40.568Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/67baac10dd5ad1e9f50e8f2659984b3b0728d54e","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/43ae0ccc4d2722b833fb59b905af129428e06d03","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/033fd42c18d9b2121595b6f1e8419a115f9ac5b7","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/aec982603aa8cc0a21143681feb5f60ecc69d718","tags":["x_transferred"]}]},{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47623","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T16:59:58.410712Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-11T17:33:00.491Z"}}]}}