{"api_version":"1","generated_at":"2026-10-24T09:35:49+00:00","cve":"CVE-2026-98655","urls":{"html":"https://cve.report/CVE-2026-98655","api":"https://cve.report/api/cve/CVE-2026-98655.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98655","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98655"},"summary":{"title":"perf: Require kernel access for text poke events","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Require kernel access for text poke events\n\nPerf events with exclude_kernel=1 can be opened without kernel perf\naccess. However, exclude_kernel does not suppress text-poke sideband\nrecords. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL\nand contains a raw kernel instruction address.\n\nAn unprivileged task can therefore open and mmap a task-local software\nevent with text_poke=1. Both opening a count-only tracepoint event and\nconfiguring UDP GRO for ESP-in-UDP cause updates to inline static calls;\nthe observer receives the relocated addresses of the modified instructions.\nFor a known kernel image, any such address reveals the runtime kernel\ntext base despite KASLR.\n\nCall perf_allow_kernel() whenever attr.text_poke is set, regardless of\nexclude_kernel. Events that neither monitor kernel execution nor request\ntext-poke records retain their existing permissions.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:17:18","updated_at":"2026-10-21 13:21:32"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/8c38cb055f6a9651198780e4e4d5283de4039f79","name":"https://git.kernel.org/stable/c/8c38cb055f6a9651198780e4e4d5283de4039f79","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7","name":"https://git.kernel.org/stable/c/8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/677d0b51ac1a0db55d768c4c6399210b3de0795b","name":"https://git.kernel.org/stable/c/677d0b51ac1a0db55d768c4c6399210b3de0795b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e506333d1b9f42f1e402acebf1283af3c44a3809","name":"https://git.kernel.org/stable/c/e506333d1b9f42f1e402acebf1283af3c44a3809","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/357e8a77a501d96c9517f01f4a211eed5e9c9184","name":"https://git.kernel.org/stable/c/357e8a77a501d96c9517f01f4a211eed5e9c9184","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98655","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98655","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e17d43b93e544f5016c0251d2074c15568d5d963 8c38cb055f6a9651198780e4e4d5283de4039f79 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e17d43b93e544f5016c0251d2074c15568d5d963 8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e17d43b93e544f5016c0251d2074c15568d5d963 e506333d1b9f42f1e402acebf1283af3c44a3809 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e17d43b93e544f5016c0251d2074c15568d5d963 677d0b51ac1a0db55d768c4c6399210b3de0795b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e17d43b93e544f5016c0251d2074c15568d5d963 357e8a77a501d96c9517f01f4a211eed5e9c9184 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 6.6.160 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.113 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.56 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.10 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"98655","cve":"CVE-2026-98655","epss":"0.001800000","percentile":"0.072420000","score_date":"2026-10-21","updated_at":"2026-10-22 00:15:10"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/events/core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"8c38cb055f6a9651198780e4e4d5283de4039f79","status":"affected","version":"e17d43b93e544f5016c0251d2074c15568d5d963","versionType":"git"},{"lessThan":"8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7","status":"affected","version":"e17d43b93e544f5016c0251d2074c15568d5d963","versionType":"git"},{"lessThan":"e506333d1b9f42f1e402acebf1283af3c44a3809","status":"affected","version":"e17d43b93e544f5016c0251d2074c15568d5d963","versionType":"git"},{"lessThan":"677d0b51ac1a0db55d768c4c6399210b3de0795b","status":"affected","version":"e17d43b93e544f5016c0251d2074c15568d5d963","versionType":"git"},{"lessThan":"357e8a77a501d96c9517f01f4a211eed5e9c9184","status":"affected","version":"e17d43b93e544f5016c0251d2074c15568d5d963","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/events/core.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":"6.6.*","status":"unaffected","version":"6.6.160","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.113","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.56","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.160","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.113","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.56","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.10","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"5.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Require kernel access for text poke events\n\nPerf events with exclude_kernel=1 can be opened without kernel perf\naccess. However, exclude_kernel does not suppress text-poke sideband\nrecords. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL\nand contains a raw kernel instruction address.\n\nAn unprivileged task can therefore open and mmap a task-local software\nevent with text_poke=1. Both opening a count-only tracepoint event and\nconfiguring UDP GRO for ESP-in-UDP cause updates to inline static calls;\nthe observer receives the relocated addresses of the modified instructions.\nFor a known kernel image, any such address reveals the runtime kernel\ntext base despite KASLR.\n\nCall perf_allow_kernel() whenever attr.text_poke is set, regardless of\nexclude_kernel. Events that neither monitor kernel execution nor request\ntext-poke records retain their existing permissions."}],"providerMetadata":{"dateUpdated":"2026-10-21T12:55:22.740Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/8c38cb055f6a9651198780e4e4d5283de4039f79"},{"url":"https://git.kernel.org/stable/c/8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7"},{"url":"https://git.kernel.org/stable/c/e506333d1b9f42f1e402acebf1283af3c44a3809"},{"url":"https://git.kernel.org/stable/c/677d0b51ac1a0db55d768c4c6399210b3de0795b"},{"url":"https://git.kernel.org/stable/c/357e8a77a501d96c9517f01f4a211eed5e9c9184"}],"title":"perf: Require kernel access for text poke events","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98655","datePublished":"2026-10-18T15:44:05.722Z","dateReserved":"2026-09-25T10:25:14.362Z","dateUpdated":"2026-10-21T12:55:22.740Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-18 16:17:18","lastModifiedDate":"2026-10-21 13:21:32","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98655","Ordinal":"1","Title":"perf: Require kernel access for text poke events","CVE":"CVE-2026-98655","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98655","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Require kernel access for text poke events\n\nPerf events with exclude_kernel=1 can be opened without kernel perf\naccess. However, exclude_kernel does not suppress text-poke sideband\nrecords. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL\nand contains a raw kernel instruction address.\n\nAn unprivileged task can therefore open and mmap a task-local software\nevent with text_poke=1. Both opening a count-only tracepoint event and\nconfiguring UDP GRO for ESP-in-UDP cause updates to inline static calls;\nthe observer receives the relocated addresses of the modified instructions.\nFor a known kernel image, any such address reveals the runtime kernel\ntext base despite KASLR.\n\nCall perf_allow_kernel() whenever attr.text_poke is set, regardless of\nexclude_kernel. Events that neither monitor kernel execution nor request\ntext-poke records retain their existing permissions.","Type":"Description","Title":"perf: Require kernel access for text poke events"}]}}}