{"api_version":"1","generated_at":"2026-09-24T19:15:57+00:00","cve":"CVE-2026-89962","urls":{"html":"https://cve.report/CVE-2026-89962","api":"https://cve.report/api/cve/CVE-2026-89962.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89962","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89962"},"summary":{"title":"powerpc/kexec_file: Prevent kexec range truncation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/kexec_file: Prevent kexec range truncation\n\nSashiko AI review pointed out the following issue.\n\nThe __merge_memory_ranges() function incorrectly handles overlapping\nmemory ranges when merging them. Although sort_memory_ranges() sorts all\nranges by their start address in ascending order beforehand, the merge\nlogic remains defective in two ways:\n\n1. It compares the current range's start against the previous element (i-1)\n   instead of the running target index (idx)\n\n2. It unconditionally overwrites 'ranges[idx].end' with 'ranges[i].end'.\n\nThis logic flaw leads to critical memory truncation when a larger memory\nrange completely subsumes subsequent smaller ranges.\n\nFor example, consider a sorted input array with three ranges:\n  Range A (idx=0): [0x1000 - 0x9000]\n  Range B (i=1):   [0x2000 - 0x5000] (completely inside Range A)\n  Range C (i=2):   [0x6000 - 0x8000] (completely inside Range A)\n\n1. When i=1 (Range B):\n   ranges[1].start (0x2000) <= ranges[0].end + 1 (0x9001) is TRUE.\n   The code executes: ranges[0].end = ranges[1].end, which erroneously\n   shrinks Range A's end from 0x9000 down to 0x5000.\n\n2. When i=2 (Range C):\n   ranges[2].start (0x6000) <= ranges[1].end + 1 (0x5001) is FALSE.\n   The code falls into the else block, creating a broken new range.\n\nAs a result, valid memory fragments [0x5001 - 0x5fff] and [0x8001 - 0x9000]\nare completely lost from the kexec exclude lists, potentially allowing\nthe crash kernel to overwrite active memory, causing data corruption\nor crashes.\n\nFix this by ensuring the start of the current range is compared against the\nend of the active merged range (idx), and use max() to safely prevent the\nouter boundary from being truncated.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-16 11:17:06","updated_at":"2026-09-16 11:17:06"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/9ef63622e6cee588ea4b763a6afc87065254b36a","name":"https://git.kernel.org/stable/c/9ef63622e6cee588ea4b763a6afc87065254b36a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/da88a2a2119e4fd0e8919a7a2448682f574e1545","name":"https://git.kernel.org/stable/c/da88a2a2119e4fd0e8919a7a2448682f574e1545","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fa40f9dbdd4af53e7445d9135b5b207eb8adf372","name":"https://git.kernel.org/stable/c/fa40f9dbdd4af53e7445d9135b5b207eb8adf372","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c4cb547f26d9b73b489c5278d0c8db837c5a174f","name":"https://git.kernel.org/stable/c/c4cb547f26d9b73b489c5278d0c8db837c5a174f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89962","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89962","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 180adfc532a83c1d74146449f7385f767d4b8059 9ef63622e6cee588ea4b763a6afc87065254b36a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 180adfc532a83c1d74146449f7385f767d4b8059 da88a2a2119e4fd0e8919a7a2448682f574e1545 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 180adfc532a83c1d74146449f7385f767d4b8059 c4cb547f26d9b73b489c5278d0c8db837c5a174f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 180adfc532a83c1d74146449f7385f767d4b8059 fa40f9dbdd4af53e7445d9135b5b207eb8adf372 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.51 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.5 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/powerpc/kexec/ranges.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"9ef63622e6cee588ea4b763a6afc87065254b36a","status":"affected","version":"180adfc532a83c1d74146449f7385f767d4b8059","versionType":"git"},{"lessThan":"da88a2a2119e4fd0e8919a7a2448682f574e1545","status":"affected","version":"180adfc532a83c1d74146449f7385f767d4b8059","versionType":"git"},{"lessThan":"c4cb547f26d9b73b489c5278d0c8db837c5a174f","status":"affected","version":"180adfc532a83c1d74146449f7385f767d4b8059","versionType":"git"},{"lessThan":"fa40f9dbdd4af53e7445d9135b5b207eb8adf372","status":"affected","version":"180adfc532a83c1d74146449f7385f767d4b8059","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/powerpc/kexec/ranges.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.9"},{"lessThan":"5.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.51","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.51","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.5","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/kexec_file: Prevent kexec range truncation\n\nSashiko AI review pointed out the following issue.\n\nThe __merge_memory_ranges() function incorrectly handles overlapping\nmemory ranges when merging them. Although sort_memory_ranges() sorts all\nranges by their start address in ascending order beforehand, the merge\nlogic remains defective in two ways:\n\n1. It compares the current range's start against the previous element (i-1)\n   instead of the running target index (idx)\n\n2. It unconditionally overwrites 'ranges[idx].end' with 'ranges[i].end'.\n\nThis logic flaw leads to critical memory truncation when a larger memory\nrange completely subsumes subsequent smaller ranges.\n\nFor example, consider a sorted input array with three ranges:\n  Range A (idx=0): [0x1000 - 0x9000]\n  Range B (i=1):   [0x2000 - 0x5000] (completely inside Range A)\n  Range C (i=2):   [0x6000 - 0x8000] (completely inside Range A)\n\n1. When i=1 (Range B):\n   ranges[1].start (0x2000) <= ranges[0].end + 1 (0x9001) is TRUE.\n   The code executes: ranges[0].end = ranges[1].end, which erroneously\n   shrinks Range A's end from 0x9000 down to 0x5000.\n\n2. When i=2 (Range C):\n   ranges[2].start (0x6000) <= ranges[1].end + 1 (0x5001) is FALSE.\n   The code falls into the else block, creating a broken new range.\n\nAs a result, valid memory fragments [0x5001 - 0x5fff] and [0x8001 - 0x9000]\nare completely lost from the kexec exclude lists, potentially allowing\nthe crash kernel to overwrite active memory, causing data corruption\nor crashes.\n\nFix this by ensuring the start of the current range is compared against the\nend of the active merged range (idx), and use max() to safely prevent the\nouter boundary from being truncated."}],"providerMetadata":{"dateUpdated":"2026-09-16T10:32:44.623Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9ef63622e6cee588ea4b763a6afc87065254b36a"},{"url":"https://git.kernel.org/stable/c/da88a2a2119e4fd0e8919a7a2448682f574e1545"},{"url":"https://git.kernel.org/stable/c/c4cb547f26d9b73b489c5278d0c8db837c5a174f"},{"url":"https://git.kernel.org/stable/c/fa40f9dbdd4af53e7445d9135b5b207eb8adf372"}],"title":"powerpc/kexec_file: Prevent kexec range truncation","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89962","datePublished":"2026-09-16T10:32:44.623Z","dateReserved":"2026-09-11T19:38:34.778Z","dateUpdated":"2026-09-16T10:32:44.623Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 11:17:06","lastModifiedDate":"2026-09-16 11:17:06","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89962","Ordinal":"1","Title":"powerpc/kexec_file: Prevent kexec range truncation","CVE":"CVE-2026-89962","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89962","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/kexec_file: Prevent kexec range truncation\n\nSashiko AI review pointed out the following issue.\n\nThe __merge_memory_ranges() function incorrectly handles overlapping\nmemory ranges when merging them. Although sort_memory_ranges() sorts all\nranges by their start address in ascending order beforehand, the merge\nlogic remains defective in two ways:\n\n1. It compares the current range's start against the previous element (i-1)\n   instead of the running target index (idx)\n\n2. It unconditionally overwrites 'ranges[idx].end' with 'ranges[i].end'.\n\nThis logic flaw leads to critical memory truncation when a larger memory\nrange completely subsumes subsequent smaller ranges.\n\nFor example, consider a sorted input array with three ranges:\n  Range A (idx=0): [0x1000 - 0x9000]\n  Range B (i=1):   [0x2000 - 0x5000] (completely inside Range A)\n  Range C (i=2):   [0x6000 - 0x8000] (completely inside Range A)\n\n1. When i=1 (Range B):\n   ranges[1].start (0x2000) <= ranges[0].end + 1 (0x9001) is TRUE.\n   The code executes: ranges[0].end = ranges[1].end, which erroneously\n   shrinks Range A's end from 0x9000 down to 0x5000.\n\n2. When i=2 (Range C):\n   ranges[2].start (0x6000) <= ranges[1].end + 1 (0x5001) is FALSE.\n   The code falls into the else block, creating a broken new range.\n\nAs a result, valid memory fragments [0x5001 - 0x5fff] and [0x8001 - 0x9000]\nare completely lost from the kexec exclude lists, potentially allowing\nthe crash kernel to overwrite active memory, causing data corruption\nor crashes.\n\nFix this by ensuring the start of the current range is compared against the\nend of the active merged range (idx), and use max() to safely prevent the\nouter boundary from being truncated.","Type":"Description","Title":"powerpc/kexec_file: Prevent kexec range truncation"}]}}}