CVE-2022-49955

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(uid: 0)\n BUG: Unable to handle kernel instruction fetch\n Faulting instruction address: 0x2fff01a8\n Oops: Kernel access of bad area, sig: 11 [#1]\n BE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=4 NUMA Cell\n Modules linked in:\n CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 6.0.0-rc2-00433-gede0a8d3307a #207\n NIP: 000000002fff01a8 LR: 0000000000032608 CTR: 0000000000000000\n REGS: c0000000015236b0 TRAP: 0400 Tainted: G W (6.0.0-rc2-00433-gede0a8d3307a)\n MSR: 0000000008001002 <ME,RI> CR: 00000000 XER: 20000000\n ...\n NIP 0x2fff01a8\n LR 0x32608\n Call Trace:\n 0xc00000000143c5f8 (unreliable)\n .rtas_call+0x224/0x320\n .rtas_get_boot_time+0x70/0x150\n .read_persistent_clock64+0x114/0x140\n .read_persistent_wall_and_boot_offset+0x24/0x80\n .timekeeping_init+0x40/0x29c\n .start_kernel+0x674/0x8f0\n start_here_common+0x1c/0x50\n\nUnlike PAPR platforms where RTAS is only used in guests, on the IBM Cell\nmachines Linux runs with MSR[HV] set but also uses RTAS, provided by\nSLOF.\n\nFix it by copying the MSR[HV] bit from the MSR value we've just read\nusing mfmsr into the value used for RTAS.\n\nIt seems like we could also fix it using an #ifdef CELL to set MSR[HV],\nbut that doesn't work because it's possible to build a single kernel\nimage that runs on both Cell native and pseries."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/powerpc/kernel/rtas_entry.S"], "versions": [{"version": "b6b1c3ce06ca438eb24e0f45bf0e63ecad0369f5", "lessThan": "8b08d4f97233d8e58fff2fd9d5f86397a49733c5", "status": "affected", "versionType": "git"}, {"version": "b6b1c3ce06ca438eb24e0f45bf0e63ecad0369f5", "lessThan": "91926d8b7e71aaf5f84f0cf208fc5a8b7a761050", "status": "affected", "versionType": "git"}, {"version": "5ca40fcf0da0ce2b5bc44e7d8b036535955f2e3d", "status": "affected", "versionType": "git"}, {"version": "5f4367448f6817c8a0e94dc9736ed84fa8eee4a3", "status": "affected", "versionType": "git"}, {"version": "c9c41f0273826a13ac93124e66a4ff45df281ba0", "status": "affected", "versionType": "git"}, {"version": "5.15.46", "lessThan": "5.16", "status": "affected", "versionType": "semver"}, {"version": "5.17.14", "lessThan": "5.18", "status": "affected", "versionType": "semver"}, {"version": "5.18.3", "lessThan": "5.19", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/powerpc/kernel/rtas_entry.S"], "versions": [{"version": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.19.8", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0", "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": "5.19", "versionEndExcluding": "5.19.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.46"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8b08d4f97233d8e58fff2fd9d5f86397a49733c5"}, {"url": "https://git.kernel.org/stable/c/91926d8b7e71aaf5f84f0cf208fc5a8b7a761050"}], "title": "powerpc/rtas: Fix RTAS MSR[HV] handling for Cell", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-49955", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-05T19:51:57.598889Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-05T20:00:12.210Z"}}]}}

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An example trace:\n\n kernel tried to execute user page (2fff01a8) - exploit attempt? (uid: 0)\n BUG: Unable to handle kernel instruction fetch\n Faulting instruction address: 0x2fff01a8\n Oops: Kernel access of bad area, sig: 11 [#1]\n BE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=4 NUMA Cell\n Modules linked in:\n CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 6.0.0-rc2-00433-gede0a8d3307a #207\n NIP: 000000002fff01a8 LR: 0000000000032608 CTR: 0000000000000000\n REGS: c0000000015236b0 TRAP: 0400 Tainted: G W (6.0.0-rc2-00433-gede0a8d3307a)\n MSR: 0000000008001002 <ME,RI> CR: 00000000 XER: 20000000\n ...\n NIP 0x2fff01a8\n LR 0x32608\n Call Trace:\n 0xc00000000143c5f8 (unreliable)\n .rtas_call+0x224/0x320\n .rtas_get_boot_time+0x70/0x150\n .read_persistent_clock64+0x114/0x140\n .read_persistent_wall_and_boot_offset+0x24/0x80\n .timekeeping_init+0x40/0x29c\n .start_kernel+0x674/0x8f0\n start_here_common+0x1c/0x50\n\nUnlike PAPR platforms where RTAS is only used in guests, on the IBM Cell\nmachines Linux runs with MSR[HV] set but also uses RTAS, provided by\nSLOF.\n\nFix it by copying the MSR[HV] bit from the MSR value we've just read\nusing mfmsr into the value used for RTAS.\n\nIt seems like we could also fix it using an #ifdef CELL to set MSR[HV],\nbut that doesn't work because it's possible to build a single kernel\nimage that runs on both Cell native and pseries."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.19.8", "versionStartIncluding": "5.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.0", "versionStartIncluding": "5.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.15.46"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.17.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.18.3"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-23T15:23:21.973Z"}}}, "cveMetadata": {"cveId": "CVE-2022-49955", "state": "PUBLISHED", "dateUpdated": "2026-11-05T20:00:12.210Z", "dateReserved": "2025-06-18T10:57:27.382Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-06-18T11:00:17.617Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/powerpc/kernel/rtas_entry.S"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8b08d4f97233d8e58fff2fd9d5f86397a49733c5", "status": "affected", "version": "b6b1c3ce06ca438eb24e0f45bf0e63ecad0369f5", "versionType": "git"}, {"lessThan": "91926d8b7e71aaf5f84f0cf208fc5a8b7a761050", "status": "affected", "version": "b6b1c3ce06ca438eb24e0f45bf0e63ecad0369f5", "versionType": "git"}, {"status": "affected", "version": "5ca40fcf0da0ce2b5bc44e7d8b036535955f2e3d", "versionType": "git"}, {"status": "affected", "version": "5f4367448f6817c8a0e94dc9736ed84fa8eee4a3", "versionType": "git"}, {"status": "affected", "version": "c9c41f0273826a13ac93124e66a4ff45df281ba0", "versionType": "git"}, {"lessThan": "5.16", "status": "affected", "version": "5.15.46", "versionType": "semver"}, {"lessThan": "5.18", "status": "affected", "version": "5.17.14", "versionType": "semver"}, {"lessThan": "5.19", "status": "affected", "version": "5.18.3", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/powerpc/kernel/rtas_entry.S"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.19"}, {"lessThan": "5.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.19.*", "status": "unaffected", "version": "5.19.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "38823576-F70F-46FB-A73D-BFB7068D387D", "versionEndExcluding": "5.16", "versionStartIncluding": "5.15.46", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "53441672-E856-4C9B-92DD-20B8133BE921", "versionEndExcluding": "5.18", "versionStartIncluding": "5.17.14", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "DBEB524B-CE23-4F7F-B400-503BD7FDC334", "versionEndExcluding": "5.19.8", "versionStartIncluding": "5.18.3", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "E8BD11A3-8643-49B6-BADE-5029A0117325", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "5F0AD220-F6A9-4012-8636-155F1B841FAD", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "A46498B3-78E1-4623-AAE1-94D29A42BE4E", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/rtas: Fix RTAS MSR[HV] handling for Cell\n\nThe semi-recent changes to MSR handling when entering RTAS (firmware)\ncause crashes on IBM Cell machines. An example trace:\n\n kernel tried to execute user page (2fff01a8) - exploit attempt? (uid: 0)\n BUG: Unable to handle kernel instruction fetch\n Faulting instruction address: 0x2fff01a8\n Oops: Kernel access of bad area, sig: 11 [#1]\n BE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=4 NUMA Cell\n Modules linked in:\n CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 6.0.0-rc2-00433-gede0a8d3307a #207\n NIP: 000000002fff01a8 LR: 0000000000032608 CTR: 0000000000000000\n REGS: c0000000015236b0 TRAP: 0400 Tainted: G W (6.0.0-rc2-00433-gede0a8d3307a)\n MSR: 0000000008001002 <ME,RI> CR: 00000000 XER: 20000000\n ...\n NIP 0x2fff01a8\n LR 0x32608\n Call Trace:\n 0xc00000000143c5f8 (unreliable)\n .rtas_call+0x224/0x320\n .rtas_get_boot_time+0x70/0x150\n .read_persistent_clock64+0x114/0x140\n .read_persistent_wall_and_boot_offset+0x24/0x80\n .timekeeping_init+0x40/0x29c\n .start_kernel+0x674/0x8f0\n start_here_common+0x1c/0x50\n\nUnlike PAPR platforms where RTAS is only used in guests, on the IBM Cell\nmachines Linux runs with MSR[HV] set but also uses RTAS, provided by\nSLOF.\n\nFix it by copying the MSR[HV] bit from the MSR value we've just read\nusing mfmsr into the value used for RTAS.\n\nIt seems like we could also fix it using an #ifdef CELL to set MSR[HV],\nbut that doesn't work because it's possible to build a single kernel\nimage that runs on both Cell native and pseries."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: powerpc/rtas: Correcci\u00f3n del manejo de MSR[HV] de RTAS para Cell. Los cambios recientes en el manejo de MSR al ingresar RTAS (firmware) provocan bloqueos en las m\u00e1quinas IBM Cell. Ejemplo de rastreo: el kernel intent\u00f3 ejecutar la p\u00e1gina de usuario (2fff01a8): \u00bfintento de explotaci\u00f3n? (uid: 0) ERROR: No se puede controlar la obtenci\u00f3n de instrucciones del n\u00facleo Direcci\u00f3n de instrucci\u00f3n err\u00f3nea: 0x2fff01a8 Oops: Acceso del n\u00facleo al \u00e1rea defectuosa, firma: 11 [#1] BE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=4 M\u00f3dulos de celda NUMA vinculados: CPU: 0 PID: 0 Comm: swapper/0 Contaminado: GW 6.0.0-rc2-00433-gede0a8d3307a #207 NIP: 000000002fff01a8 LR: 0000000000032608 CTR: 000000000000000 REGS: c0000000015236b0 TRAP: 0400 Contaminado: GW (6.0.0-rc2-00433-gede0a8d3307a) MSR: 0000000008001002 CR: 00000000 XER: 20000000 ... NIP 0x2fff01a8 LR 0x32608 Rastreo de llamadas: 0xc00000000143c5f8 (no confiable) .rtas_call+0x224/0x320 .rtas_get_boot_time+0x70/0x150 .read_persistent_clock64+0x114/0x140 .read_persistent_wall_and_boot_offset+0x24/0x80 .timekeeping_init+0x40/0x29c A diferencia de las plataformas PAPR, donde RTAS solo se usa en hu\u00e9spedes, en las m\u00e1quinas IBM Cell, Linux se ejecuta con MSR[HV] activado, pero tambi\u00e9n usa RTAS, proporcionado por SLOF. Para solucionarlo, copie el bit MSR[HV] del valor MSR que acabamos de leer con mfmsr al valor usado para RTAS. Parece que tambi\u00e9n podr\u00edamos solucionarlo usando un #ifdef CELL para activar MSR[HV], pero esto no funciona, ya que es posible crear una \u00fanica imagen de kernel que funcione tanto en Cell nativo como en pseries."}], "id": "CVE-2022-49955", "lastModified": "2026-11-05T20:17:18.723", "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-2022-49955", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T19:51:57.598889Z", "version": "2.0.3"}}]}, "published": "2025-06-18T11:15:22.630", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8b08d4f97233d8e58fff2fd9d5f86397a49733c5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/91926d8b7e71aaf5f84f0cf208fc5a8b7a761050"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: powerpc/rtas: Fix RTAS MSR[HV] handling for Cell", "id": "2373676", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373676"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\npowerpc/rtas: Fix RTAS MSR[HV] handling for Cell\nThe semi-recent changes to MSR handling when entering RTAS (firmware)\ncause crashes on IBM Cell machines. An example trace:\nkernel tried to execute user page (2fff01a8) - exploit attempt? (uid: 0)\nBUG: Unable to handle kernel instruction fetch\nFaulting instruction address: 0x2fff01a8\nOops: Kernel access of bad area, sig: 11 [#1]\nBE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=4 NUMA Cell\nModules linked in:\nCPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 6.0.0-rc2-00433-gede0a8d3307a #207\nNIP: 000000002fff01a8 LR: 0000000000032608 CTR: 0000000000000000\nREGS: c0000000015236b0 TRAP: 0400 Tainted: G W (6.0.0-rc2-00433-gede0a8d3307a)\nMSR: 0000000008001002 <ME,RI> CR: 00000000 XER: 20000000\n...\nNIP 0x2fff01a8\nLR 0x32608\nCall Trace:\n0xc00000000143c5f8 (unreliable)\n.rtas_call+0x224/0x320\n.rtas_get_boot_time+0x70/0x150\n.read_persistent_clock64+0x114/0x140\n.read_persistent_wall_and_boot_offset+0x24/0x80\n.timekeeping_init+0x40/0x29c\n.start_kernel+0x674/0x8f0\nstart_here_common+0x1c/0x50\nUnlike PAPR platforms where RTAS is only used in guests, on the IBM Cell\nmachines Linux runs with MSR[HV] set but also uses RTAS, provided by\nSLOF.\nFix it by copying the MSR[HV] bit from the MSR value we've just read\nusing mfmsr into the value used for RTAS.\nIt seems like we could also fix it using an #ifdef CELL to set MSR[HV],\nbut that doesn't work because it's possible to build a single kernel\nimage that runs on both Cell native and pseries."], "name": "CVE-2022-49955", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "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": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49955\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49955\nhttps://lore.kernel.org/linux-cve-announce/2025061811-CVE-2022-49955-500b@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-06-23T08:45:29.169468+00:00", "updated": "2025-06-23T08:45:29.169589+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}