CVE-2021-47623

{"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": "2026-05-11T13:58:05.571Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:58:05.571Z"}, "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"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"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"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:47:40.568Z"}}, {"title": "CISA ADP Vulnrichment", "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"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T12:42:14.030Z"}}], "cna": {"title": "powerpc/fixmap: Fix VM debug warning on unmap", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "265c3491c4bc8d40587996d6ee2f447a7ccfb4f3", "lessThan": "67baac10dd5ad1e9f50e8f2659984b3b0728d54e", "versionType": "git"}, {"status": "affected", "version": "265c3491c4bc8d40587996d6ee2f447a7ccfb4f3", "lessThan": "43ae0ccc4d2722b833fb59b905af129428e06d03", "versionType": "git"}, {"status": "affected", "version": "265c3491c4bc8d40587996d6ee2f447a7ccfb4f3", "lessThan": "033fd42c18d9b2121595b6f1e8419a115f9ac5b7", "versionType": "git"}, {"status": "affected", "version": "265c3491c4bc8d40587996d6ee2f447a7ccfb4f3", "lessThan": "aec982603aa8cc0a21143681feb5f60ecc69d718", "versionType": "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"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.5"}, {"status": "unaffected", "version": "0", "lessThan": "5.5", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.101", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.24", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "5.16.10", "versionType": "semver", "lessThanOrEqual": "5.16.*"}, {"status": "unaffected", "version": "5.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "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"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.101", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.24", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.16.10", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.17", "versionStartIncluding": "5.5"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-12-09T21:44:17.581Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47623", "state": "PUBLISHED", "dateUpdated": "2025-12-09T21:44:17.581Z", "dateReserved": "2024-07-16T11:26:52.956Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-07-16T11:29:39.071Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "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"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "67baac10dd5ad1e9f50e8f2659984b3b0728d54e", "status": "affected", "version": "265c3491c4bc8d40587996d6ee2f447a7ccfb4f3", "versionType": "git"}, {"lessThan": "43ae0ccc4d2722b833fb59b905af129428e06d03", "status": "affected", "version": "265c3491c4bc8d40587996d6ee2f447a7ccfb4f3", "versionType": "git"}, {"lessThan": "033fd42c18d9b2121595b6f1e8419a115f9ac5b7", "status": "affected", "version": "265c3491c4bc8d40587996d6ee2f447a7ccfb4f3", "versionType": "git"}, {"lessThan": "aec982603aa8cc0a21143681feb5f60ecc69d718", "status": "affected", "version": "265c3491c4bc8d40587996d6ee2f447a7ccfb4f3", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "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"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.5"}, {"lessThan": "5.5", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.101", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.24", "versionType": "semver"}, {"lessThanOrEqual": "5.16.*", "status": "unaffected", "version": "5.16.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.17", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F37E3FA0-7A8B-4AAF-9748-96E34396B25B", "versionEndExcluding": "5.10.101", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "866451F0-299E-416C-B0B8-AE6B33E62CCA", "versionEndExcluding": "5.15.24", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "679523BA-1392-404B-AB85-F5A5408B1ECC", "versionEndExcluding": "5.16.10", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*", "matchCriteriaId": "7BD5F8D9-54FA-4CB0-B4F0-CB0471FDDB2D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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 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 &lt;0fe00000&gt; 9421ffe0 93e1001c 48000030 Implemente unmap_kernel_page() que borra un pte existente."}], "id": "CVE-2021-47623", "lastModified": "2026-06-17T04:18:11.293", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47623", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T16:59:58.410712Z", "version": "2.0.3"}}]}, "published": "2024-07-16T12:15:02.483", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "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": "af854a3a-2127-422b-91ae-364da2661108", "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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:6991", "cpe": "cpe:/a:redhat:rhel_e4s:9.0", "package": "kernel-0:5.14.0-70.117.1.el9_0", "product_name": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date": "2024-09-24T00:00:00Z"}], "bugzilla": {"description": "kernel: powerpc/fixmap: Fix VM debug warning on unmap", "id": "2298107", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2298107"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\npowerpc/fixmap: Fix VM debug warning on unmap\nUnmapping a fixmap entry is done by calling __set_fixmap()\nwith FIXMAP_PAGE_CLEAR as flags.\nToday, powerpc __set_fixmap() calls map_kernel_page().\nmap_kernel_page() is not happy when called a second time\nfor the same page.\nWARNING: CPU: 0 PID: 1 at arch/powerpc/mm/pgtable.c:194 set_pte_at+0xc/0x1e8\nCPU: 0 PID: 1 Comm: swapper Not tainted 5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty #682\nNIP: c0017cd4 LR: c00187f0 CTR: 00000010\nREGS: e1011d50 TRAP: 0700 Not tainted (5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty)\nMSR: 00029032 <EE,ME,IR,DR,RI> CR: 42000208 XER: 00000000\nGPR00: c0165fec e1011e10 c14c0000 c0ee2550 ff800000 c0f3d000 00000000 c001686c\nGPR08: 00001000 b00045a9 00000001 c0f58460 c0f50000 00000000 c0007e10 00000000\nGPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000\nGPR24: 00000000 00000000 c0ee2550 00000000 c0f57000 00000ff8 00000000 ff800000\nNIP [c0017cd4] set_pte_at+0xc/0x1e8\nLR [c00187f0] map_kernel_page+0x9c/0x100\nCall Trace:\n[e1011e10] [c0736c68] vsnprintf+0x358/0x6c8 (unreliable)\n[e1011e30] [c0165fec] __set_fixmap+0x30/0x44\n[e1011e40] [c0c13bdc] early_iounmap+0x11c/0x170\n[e1011e70] [c0c06cb0] ioremap_legacy_serial_console+0x88/0xc0\n[e1011e90] [c0c03634] do_one_initcall+0x80/0x178\n[e1011ef0] [c0c0385c] kernel_init_freeable+0xb4/0x250\n[e1011f20] [c0007e34] kernel_init+0x24/0x140\n[e1011f30] [c0016268] ret_from_kernel_thread+0x5c/0x64\nInstruction dump:\n7fe3fb78 48019689 80010014 7c630034 83e1000c 5463d97e 7c0803a6 38210010\n4e800020 81250000 712a0001 41820008 <0fe00000> 9421ffe0 93e1001c 48000030\nImplement unmap_kernel_page() which clears an existing pte."], "name": "CVE-2021-47623", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-07-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47623\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47623\nhttps://lore.kernel.org/linux-cve-announce/2024071645-CVE-2021-47623-407f@gregkh/T"], "threat_severity": "Low"}

{}