{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49440", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.570Z", "datePublished": "2025-02-26T02:12:53.988Z", "dateUpdated": "2026-05-11T18:59:51.690Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T18:59:51.690Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/rtas: Keep MSR[RI] set when calling RTAS\n\nRTAS runs in real mode (MSR[DR] and MSR[IR] unset) and in 32-bit big\nendian mode (MSR[SF,LE] unset).\n\nThe change in MSR is done in enter_rtas() in a relatively complex way,\nsince the MSR value could be hardcoded.\n\nFurthermore, a panic has been reported when hitting the watchdog interrupt\nwhile running in RTAS, this leads to the following stack trace:\n\n watchdog: CPU 24 Hard LOCKUP\n watchdog: CPU 24 TB:997512652051031, last heartbeat TB:997504470175378 (15980ms ago)\n ...\n Supported: No, Unreleased kernel\n CPU: 24 PID: 87504 Comm: drmgr Kdump: loaded Tainted: G E X 5.14.21-150400.71.1.bz196362_2-default #1 SLE15-SP4 (unreleased) 0d821077ef4faa8dfaf370efb5fdca1fa35f4e2c\n NIP: 000000001fb41050 LR: 000000001fb4104c CTR: 0000000000000000\n REGS: c00000000fc33d60 TRAP: 0100 Tainted: G E X (5.14.21-150400.71.1.bz196362_2-default)\n MSR: 8000000002981000 CR: 48800002 XER: 20040020\n CFAR: 000000000000011c IRQMASK: 1\n GPR00: 0000000000000003 ffffffffffffffff 0000000000000001 00000000000050dc\n GPR04: 000000001ffb6100 0000000000000020 0000000000000001 000000001fb09010\n GPR08: 0000000020000000 0000000000000000 0000000000000000 0000000000000000\n GPR12: 80040000072a40a8 c00000000ff8b680 0000000000000007 0000000000000034\n GPR16: 000000001fbf6e94 000000001fbf6d84 000000001fbd1db0 000000001fb3f008\n GPR20: 000000001fb41018 ffffffffffffffff 000000000000017f fffffffffffff68f\n GPR24: 000000001fb18fe8 000000001fb3e000 000000001fb1adc0 000000001fb1cf40\n GPR28: 000000001fb26000 000000001fb460f0 000000001fb17f18 000000001fb17000\n NIP [000000001fb41050] 0x1fb41050\n LR [000000001fb4104c] 0x1fb4104c\n Call Trace:\n Instruction dump:\n XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX\n XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX\n Oops: Unrecoverable System Reset, sig: 6 [#1]\n LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries\n ...\n Supported: No, Unreleased kernel\n CPU: 24 PID: 87504 Comm: drmgr Kdump: loaded Tainted: G E X 5.14.21-150400.71.1.bz196362_2-default #1 SLE15-SP4 (unreleased) 0d821077ef4faa8dfaf370efb5fdca1fa35f4e2c\n NIP: 000000001fb41050 LR: 000000001fb4104c CTR: 0000000000000000\n REGS: c00000000fc33d60 TRAP: 0100 Tainted: G E X (5.14.21-150400.71.1.bz196362_2-default)\n MSR: 8000000002981000 CR: 48800002 XER: 20040020\n CFAR: 000000000000011c IRQMASK: 1\n GPR00: 0000000000000003 ffffffffffffffff 0000000000000001 00000000000050dc\n GPR04: 000000001ffb6100 0000000000000020 0000000000000001 000000001fb09010\n GPR08: 0000000020000000 0000000000000000 0000000000000000 0000000000000000\n GPR12: 80040000072a40a8 c00000000ff8b680 0000000000000007 0000000000000034\n GPR16: 000000001fbf6e94 000000001fbf6d84 000000001fbd1db0 000000001fb3f008\n GPR20: 000000001fb41018 ffffffffffffffff 000000000000017f fffffffffffff68f\n GPR24: 000000001fb18fe8 000000001fb3e000 000000001fb1adc0 000000001fb1cf40\n GPR28: 000000001fb26000 000000001fb460f0 000000001fb17f18 000000001fb17000\n NIP [000000001fb41050] 0x1fb41050\n LR [000000001fb4104c] 0x1fb4104c\n Call Trace:\n Instruction dump:\n XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX\n XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX\n ---[ end trace 3ddec07f638c34a2 ]---\n\nThis happens because MSR[RI] is unset when entering RTAS but there is no\nvalid reason to not set it here.\n\nRTAS is expected to be called with MSR[RI] as specified in PAPR+ section\n\"7.2.1 Machine State\":\n\n R1–7.2.1–9. If called with MSR[RI] equal to 1, then RTAS must protect\n its own critical regions from recursion by setting the MSR[RI] bit to\n 0 when in the critical regions.\n\nFixing this by reviewing the way MSR is compute before calling RTAS. Now a\nhardcoded value meaning real \n---truncated---" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/powerpc/kernel/entry_64.S", "arch/powerpc/kernel/rtas.c" ], "versions": [ { "version": "44c9f3cc1a07503b653b571eac5792436da39a30", "lessThan": "5ca40fcf0da0ce2b5bc44e7d8b036535955f2e3d", "status": "affected", "versionType": "git" }, { "version": "44c9f3cc1a07503b653b571eac5792436da39a30", "lessThan": "5f4367448f6817c8a0e94dc9736ed84fa8eee4a3", "status": "affected", "versionType": "git" }, { "version": "44c9f3cc1a07503b653b571eac5792436da39a30", "lessThan": "c9c41f0273826a13ac93124e66a4ff45df281ba0", "status": "affected", "versionType": "git" }, { "version": "44c9f3cc1a07503b653b571eac5792436da39a30", "lessThan": "b6b1c3ce06ca438eb24e0f45bf0e63ecad0369f5", "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/kernel/entry_64.S", "arch/powerpc/kernel/rtas.c" ], "versions": [ { "version": "2.6.34", "status": "affected" }, { "version": "0", "lessThan": "2.6.34", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.46", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.14", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.3", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19", "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": "2.6.34", "versionEndExcluding": "5.15.46" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.17.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.18.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5ca40fcf0da0ce2b5bc44e7d8b036535955f2e3d" }, { "url": "https://git.kernel.org/stable/c/5f4367448f6817c8a0e94dc9736ed84fa8eee4a3" }, { "url": "https://git.kernel.org/stable/c/c9c41f0273826a13ac93124e66a4ff45df281ba0" }, { "url": "https://git.kernel.org/stable/c/b6b1c3ce06ca438eb24e0f45bf0e63ecad0369f5" } ], "title": "powerpc/rtas: Keep MSR[RI] set when calling RTAS", "x_generator": { "engine": "bippy-1.2.0" } } } }